The Pre-Collision System (PCS) is one of the most important safety features on your 2024+ Tacoma - part of Toyota Safety Sense 3.0. Whether you're new to the system or want to configure it for your driving style, here's what it does, how it works, and what to realistically expect.
(Reference: Owner's Manual, pg. 253-263, 643)
WARNING: For safe use
Driving safely is solely the responsibility of the driver. Pay careful attention to the surrounding conditions in order to ensure safe driving. Never use the pre-collision system in place of normal braking operations. This system cannot help avoid or reduce the impact of a collision in every situation. Over-reliance on this system to drive the vehicle safely may lead to an accident resulting in death or serious injury.
Source: Page 253
WARNING: System Effectiveness
Although the pre-collision system is designed to help avoid or help reduce the impact of a collision, its effectiveness may change according to various conditions. Therefore, it may not always be able to achieve the same level of performance. Read the following items carefully. Do not overly rely on this system and always drive carefully.
Source: Page 253
WARNING: Pre-collision braking
When the pre-collision braking function is operating, a large amount of braking force will be applied.
Source: Page 256
WARNING: Braking function limitations
The pre-collision braking function is not designed to hold the vehicle stopped. If the vehicle is stopped by pre-collision brake control, the driver should operate the brakes immediately as necessary.
Source: Page 256
WARNING: Braking function operation conditions
The pre-collision braking function may not operate if certain operations are performed by the driver. If the accelerator pedal is being depressed strongly or the steering wheel is being turned, the system may determine that the driver is taking evasive action and possibly prevent the pre-collision braking function from operating.
Source: Page 256
WARNING: Braking cancellation by driver input
If the brake pedal is being depressed, the system may determine that the driver is taking evasive action and possibly delay the operation timing of the pre-collision brake control.
Source: Page 256
WARNING: Acceleration Suppression at Low Speed (steering wheel operation)
If the steering wheel is being turned, the system may determine that the driver is taking evasive action and possibly prevent the Acceleration Suppression at Low Speed function from operating or possibly causing its operation to be canceled.
Source: Page 257
WARNING: Emergency steering assist cancellation
The emergency steering assist will be canceled when the system determines that lane departure prevention control has completed.
Source: Page 257
WARNING: Emergency steering assist operation conditions
Depending on operations performed by the driver, emergency steering assist may not operate or operation may be canceled.
Source: Page 257
---
The Toyota Pre-Collision System (PCS) is a sensor-based safety feature that helps detect objects in the vehicle's path and provides multiple layers of intervention to help avoid or mitigate collisions. It uses front-mounted sensors to monitor the road ahead and determine collision probability.
The system operates through several coordinated functions:
System Activation: The Pre-Collision System is enabled each time the engine switch is turned ON. The system is fully functional once the vehicle has been driven a certain amount after engine start.
Important: The system requires adequate electrical supply from the vehicle battery. If the battery has been recently disconnected and reconnected, the system will not operate until the vehicle has been driven a sufficient distance.
Source: Pages 253-254
---
The system can detect the following objects in the vehicle's path:
Detection Principle: Objects are detected based on their size, shape, and movement. The system continuously monitors these characteristics to determine if a collision threat exists.
Source: Page 254
---
As of early 2025, there are no documented Technical Service Bulletins or recalls for TSS 3.0 PCS malfunctions on 4th Gen Tacoma. The system has strong reliability, though the platform is still relatively new (2024+ model years).
Pro Tips from the Community:
Understanding Relative Speed Activation: The PCS system requires a relative speed differential between your vehicle and the detected object to trigger reliably. Simply approaching a stationary object may not activate the system—the system calculates speed differences, not just proximity. This is why the system activates more predictably at higher speeds (above 32 mph) where speed differential is clearer.
Source: TacomaWorld.com PCS discussion forum
Typical Activation Distance is Normal: Some owners report PCS activating at approximately 4-5 feet from obstacles and interpret this as a system malfunction. This is normal operation—the system is designed to activate at distances that allow emergency braking to be effective, not at excessive distances. Understanding normal behavior prevents unnecessary dealer visits.
Source: TacomaWorld.com PCS discussion forum
---
Function Description:
When PCS detects high collision risk, it immediately alerts you with visual and auditory warnings, giving you time to react.
How It Works:
Cancellation: While the pre-collision warning is operating, if the steering wheel is operated heavily or suddenly, the pre-collision warning may be canceled.
Operating Speed Ranges:
Source: Pages 255-257
---
Function Description:
If collision risk is high and you're not braking hard enough, the system automatically adds braking force to help you avoid impact.
How It Works:
Operating Speed Ranges:
Source: Page 257
---
Function Description:
When a collision is imminent, the system automatically applies the brakes to help you avoid it or reduce the impact.
How It Works:
Critical Safety Information:
Cancellation Conditions:
The pre-collision braking function will be canceled if:
Source: Page 258
---
Function Description:
When collision risk is high and specific conditions are met, the system provides steering assistance to help enhance vehicle stability and prevent lane departure. This function works in conjunction with the vehicle's lane departure prevention control.
Activation Requirements:
How It Works:
Visual Alert: During assistance, in addition to the pre-collision warning, a specific icon is displayed on the multi-information display.
Cancellation Conditions:
The emergency steering assist will be canceled when:
When System Cannot Operate:
Source: Page 259
---
Function Description:
When turning left or right at an intersection and the system detects oncoming traffic, pedestrians, or bicycles in the vehicle's path, the system provides collision warnings and automatic braking assistance.
Activation Scenarios:
Operating Speed Ranges:
Important: Depending on the specific intersection geometry and conditions, assistance may not operate correctly. Drivers should always follow traffic rules and visually confirm safety before turning.
Source: Pages 259-260
---
Function Description:
At intersections and similar locations, when the system detects an approaching vehicle or motorcycle crossing the vehicle's path, the system provides collision warnings and automatic braking.
How It Works:
Operating Speeds (vehicles and motorcycles crossing from the side):
Important: System operation depends on intersection geometry. Assistance may not operate correctly in all intersection types.
Source: Page 260
---
Function Description:
When driving at low speeds, if the driver depresses the accelerator pedal strongly while the system detects a collision possibility, the system restricts engine output and may apply light braking to prevent unintended acceleration into an obstacle.
Applicable Vehicles: This feature operates on automatic transmission vehicles. Manual transmission vehicles do not have this function.
How It Works:
Driver Alerts:
Operating Speed Range: This function operates at 0-9 mph (0-15 km/h) with objects at all relative speeds within this range.
Source: Pages 261-262
---
Function Description:
For vehicles equipped with Adaptive Variable Suspension, when the system determines a collision is high probability, the system controls shock absorber damping to optimize vehicle posture and help maintain stability.
How It Works:
Note: This feature is only available on vehicles equipped with Adaptive Variable Suspension system.
Source: Page 263
---
How the System Detects Objects:
Objects are detected based on their size, shape, and movement. The system relies on front-mounted sensors that continuously scan the road ahead.
Important Factor: Depending on the ambient brightness, movement, posture, and direction of a detectable object, it may not be detected and the system may not operate properly. Lighting conditions significantly impact detection reliability.
Why Relative Speed Differential Matters:
The PCS system requires a relative speed differential between your vehicle and the detected object to trigger reliably. Simply approaching a stationary object may not activate the system—the system calculates speed differences, not just proximity. This is why the system activates more predictably at higher speeds (above 32 mph) where speed differential is clearer.
Source: Page 261, Manual + TacomaWorld.com community research
---
The system may determine that collision risk is high and operate even though an actual collision is not likely in these situations:
Source: Page 261
---
The system may fail to detect a detectable object and not operate properly in these situations:
General Detection Failures:
Pedestrian-Specific Non-Detection:
Bicycle-Specific Non-Detection:
Timing-Related Non-Detection:
Emergency Steering Assist Specific Limitations:
Wall Detection Limitations (Automatic Transmission Vehicles):
Source: Pages 261-262
---
The Pre-Collision System will not operate in the following situations, regardless of collision risk:
Source: Page 262
---
The system monitors driver inputs and will not operate or will cancel operation when the system determines the driver is taking independent evasive action:
Rationale: The system is designed to assist the driver, not override driver decisions. When the system detects that the driver is actively controlling the vehicle, it backs away to prevent conflicting control inputs.
Source: Page 262
---
The Pre-Collision System can be enabled/disabled and warning timing can be adjusted through the vehicle's customization settings. Settings are accessed through the vehicle's multi-information display.
Location: Customization settings (refer to page 643 in the owner's manual for navigation details)
Important: All PCS settings are reset to defaults each time the engine switch is turned ON. Settings modified through customization are persistent and will be applied at the next engine start.
Source: Page 643
---
---
Pre-Collision System (ON/OFF):
Warning Timing (Later/Default/Earlier):
Note: The Earlier setting provides more warning time but may increase false positive alerts. The Later setting reduces alerts but provides less reaction time.
Source: Page 643
---
The TSS 3.0 forward-facing camera mounted behind your windshield requires professional recalibration after any windshield service, collision repair, or major front-end work. This is a critical maintenance step, not optional.
When Calibration is Required:
TSS Calibration Before Lift Installation:
If you're planning to lift your 4th Gen Tacoma and will need windshield replacement, schedule TSS calibration while the vehicle is still at stock height. This ensures the forward-facing camera and radar sensors are calibrated correctly before suspension modifications alter sight lines.
Source: 4GTaco.com community research
Cost Expectations: Recalibration typically costs $300-500 and is covered under warranty after accidents. This is cheaper than collision damage and essential for system reliability.
Warranty Coverage for TSS Diagnostics:
TSS system diagnostics and verification are free during the 3-year/36,000-mile basic warranty. Dealers should not charge diagnostic fees for investigating PCS indicators. If a dealer attempts to charge for TSS diagnostics, request warranty coverage.
Source: 4GTaco.com, ToyotaNation.com community research
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Real owners report that Pre-Collision Brake Control is particularly useful during low-speed maneuvering, such as slowly pulling into a tight garage. The automatic braking assistance helps prevent accidental impacts in confined spaces where human reaction time might be slower.
Source: ToyotaNation.com community research
---
The TSS 3.0 system, including PCS, performs well in urban and city driving with frequent stops. The dynamic radar cruise control and pre-collision warning work together effectively in stop-and-go traffic patterns common in metropolitan areas.
Source: ToyotaNation.com community research
---
Misunderstanding Detection Distance as a Safety Problem:
Some owners report PCS activating at approximately 4-5 feet from obstacles, and interpret this as a system malfunction. This is normal operation—the system is designed to activate at distances that allow emergency braking to be effective, not at excessive distances. Dealer recalibration attempts usually confirm the system is working correctly. Understanding normal behavior prevents unnecessary dealer visits and expensive troubleshooting.
Source: TacomaWorld.com
Ignoring Windshield Replacement Calibration Requirements:
The TSS 3.0 camera mounted behind the windshield requires professional recalibration after any windshield service. Skipping this step can result in unpredictable PCS behavior including false positives or failures to detect genuine threats.
Source: 4GTaco.com
Relying on PCS for Daily Driving Safety Instead of Active Attention:
The system functions as an emergency collision-reduction feature, not a daily driving aid. Owners expecting the system to be a "safety net" for inattentive driving experience excessive false alerts. The system works best when combined with attentive driving.
Source: TacomaWorld.com
---
Owner's Manual Pages:
Additional Sources:
Disclaimer:
This guide is derived from the official 2024+ Toyota Tacoma Owner's Manual with supplementary information from the owner community and authoritative sources. Always follow your official owner's manual for warranty compliance. This is a reference guide only. Driving safely is solely the responsibility of the driver.
(Reference: Owner's Manual, pg. 253-263, 643)
Official Manual Information
Safety Precautions
WARNING: For safe use
Driving safely is solely the responsibility of the driver. Pay careful attention to the surrounding conditions in order to ensure safe driving. Never use the pre-collision system in place of normal braking operations. This system cannot help avoid or reduce the impact of a collision in every situation. Over-reliance on this system to drive the vehicle safely may lead to an accident resulting in death or serious injury.
Source: Page 253
WARNING: System Effectiveness
Although the pre-collision system is designed to help avoid or help reduce the impact of a collision, its effectiveness may change according to various conditions. Therefore, it may not always be able to achieve the same level of performance. Read the following items carefully. Do not overly rely on this system and always drive carefully.
Source: Page 253
WARNING: Pre-collision braking
When the pre-collision braking function is operating, a large amount of braking force will be applied.
Source: Page 256
WARNING: Braking function limitations
The pre-collision braking function is not designed to hold the vehicle stopped. If the vehicle is stopped by pre-collision brake control, the driver should operate the brakes immediately as necessary.
Source: Page 256
WARNING: Braking function operation conditions
The pre-collision braking function may not operate if certain operations are performed by the driver. If the accelerator pedal is being depressed strongly or the steering wheel is being turned, the system may determine that the driver is taking evasive action and possibly prevent the pre-collision braking function from operating.
Source: Page 256
WARNING: Braking cancellation by driver input
If the brake pedal is being depressed, the system may determine that the driver is taking evasive action and possibly delay the operation timing of the pre-collision brake control.
Source: Page 256
WARNING: Acceleration Suppression at Low Speed (steering wheel operation)
If the steering wheel is being turned, the system may determine that the driver is taking evasive action and possibly prevent the Acceleration Suppression at Low Speed function from operating or possibly causing its operation to be canceled.
Source: Page 257
WARNING: Emergency steering assist cancellation
The emergency steering assist will be canceled when the system determines that lane departure prevention control has completed.
Source: Page 257
WARNING: Emergency steering assist operation conditions
Depending on operations performed by the driver, emergency steering assist may not operate or operation may be canceled.
Source: Page 257
---
Pre-Collision System Overview
The Toyota Pre-Collision System (PCS) is a sensor-based safety feature that helps detect objects in the vehicle's path and provides multiple layers of intervention to help avoid or mitigate collisions. It uses front-mounted sensors to monitor the road ahead and determine collision probability.
The system operates through several coordinated functions:
- Alerts the driver through warnings when a collision is possible
- Assists braking if driver response is insufficient
- Applies automatic braking if collision is imminent
- Provides steering assistance to help maintain vehicle stability
- Controls suspension stiffness to optimize vehicle posture
- Restricts acceleration in low-speed situations
System Activation: The Pre-Collision System is enabled each time the engine switch is turned ON. The system is fully functional once the vehicle has been driven a certain amount after engine start.
Important: The system requires adequate electrical supply from the vehicle battery. If the battery has been recently disconnected and reconnected, the system will not operate until the vehicle has been driven a sufficient distance.
Source: Pages 253-254
---
What PCS Can Detect
The system can detect the following objects in the vehicle's path:
- Vehicles (cars, trucks, and other motor vehicles)
- Pedestrians (people in various postures and movements)
- Bicycles (ridden bicycles only; stationary bicycles not detected)
- Motorcycles (ridden motorcycles only)
- Walls (barriers, guardrails, and solid structures)
Detection Principle: Objects are detected based on their size, shape, and movement. The system continuously monitors these characteristics to determine if a collision threat exists.
Source: Page 254
---
Real-World Performance Context
As of early 2025, there are no documented Technical Service Bulletins or recalls for TSS 3.0 PCS malfunctions on 4th Gen Tacoma. The system has strong reliability, though the platform is still relatively new (2024+ model years).
Pro Tips from the Community:
Understanding Relative Speed Activation: The PCS system requires a relative speed differential between your vehicle and the detected object to trigger reliably. Simply approaching a stationary object may not activate the system—the system calculates speed differences, not just proximity. This is why the system activates more predictably at higher speeds (above 32 mph) where speed differential is clearer.
Source: TacomaWorld.com PCS discussion forum
Typical Activation Distance is Normal: Some owners report PCS activating at approximately 4-5 feet from obstacles and interpret this as a system malfunction. This is normal operation—the system is designed to activate at distances that allow emergency braking to be effective, not at excessive distances. Understanding normal behavior prevents unnecessary dealer visits.
Source: TacomaWorld.com PCS discussion forum
---
Core Functions and Operation
1. Pre-Collision Warning
Function Description:
When PCS detects high collision risk, it immediately alerts you with visual and auditory warnings, giving you time to react.
How It Works:
- A buzzer sounds to alert the driver
- An icon appears on the multi-information display
- A warning message displays on the screen
- If the detectable object is a vehicle, moderate braking is automatically initiated with the warning
Cancellation: While the pre-collision warning is operating, if the steering wheel is operated heavily or suddenly, the pre-collision warning may be canceled.
Operating Speed Ranges:
| Detectable Object | Vehicle Speed | Relative Speed |
|---|---|---|
| Preceding vehicles, stopped vehicles | 3-110 mph (5-180 km/h) | 3-110 mph (5-180 km/h) |
| Oncoming vehicles | 20-110 mph (30-180 km/h) | 50-130 mph (80-220 km/h) |
| Bicycles | 3-50 mph (5-80 km/h) | 3-50 mph (5-80 km/h) |
| Pedestrians | 3-50 mph (5-80 km/h) | 3-50 mph (5-80 km/h) |
| Preceding motorcycles, stopped motorcycles | 3-110 mph (5-180 km/h) | 3-50 mph (5-80 km/h) |
| Oncoming motorcycles | 20-110 mph (30-180 km/h) | 20-110 mph (30-180 km/h) |
Source: Pages 255-257
---
2. Pre-Collision Brake Assist
Function Description:
If collision risk is high and you're not braking hard enough, the system automatically adds braking force to help you avoid impact.
How It Works:
- System monitors driver's brake pedal input
- Compares collision risk against braking force being applied
- If additional braking is needed, system increases brake pressure automatically
- Provides additional stopping power without requiring driver intervention
Operating Speed Ranges:
| Detectable Object | Vehicle Speed | Relative Speed |
|---|---|---|
| Preceding vehicles, stopped vehicles | 20-110 mph (30-180 km/h) | 7-110 mph (10-180 km/h) |
| Bicycles | 20-50 mph (30-80 km/h) | 20-50 mph (30-80 km/h) |
| Pedestrians | 20-50 mph (30-80 km/h) | 20-50 mph (30-80 km/h) |
| Preceding motorcycles, stopped motorcycles | 20-110 mph (30-180 km/h) | 7-50 mph (10-80 km/h) |
Source: Page 257
---
3. Pre-Collision Brake Control (Automatic Emergency Braking)
Function Description:
When a collision is imminent, the system automatically applies the brakes to help you avoid it or reduce the impact.
How It Works:
- Continuously monitors distance and collision probability
- When collision becomes imminent, activates automatic braking
- Applies braking force without requiring driver pedal input
- Designed to provide maximum stopping force in collision-avoidance scenarios
Critical Safety Information:
- When pre-collision braking is active, a large amount of braking force will be applied
- The system is not designed to hold the vehicle stopped after collision avoidance
- If the vehicle is stopped by pre-collision brake control, the driver must immediately operate the brakes to maintain vehicle stop
Cancellation Conditions:
The pre-collision braking function will be canceled if:
- The accelerator pedal is strongly depressed (driver is accelerating)
- The steering wheel is operated heavily or suddenly (driver is steering hard)
Source: Page 258
---
4. Emergency Steering Assist
Function Description:
When collision risk is high and specific conditions are met, the system provides steering assistance to help enhance vehicle stability and prevent lane departure. This function works in conjunction with the vehicle's lane departure prevention control.
Activation Requirements:
- The system determines a collision is high probability
- Sufficient space exists within the current lane for evasive steering maneuvers
- The driver is actively operating the steering wheel (hands on wheel)
How It Works:
- System monitors steering input and collision vectors
- Provides counter-steering assistance to help vehicle avoid collision
- Works to keep vehicle in appropriate lane position
- Operates simultaneously with pre-collision warning alerts
Visual Alert: During assistance, in addition to the pre-collision warning, a specific icon is displayed on the multi-information display.
Cancellation Conditions:
The emergency steering assist will be canceled when:
- The system determines that lane departure prevention control has completed
- The accelerator pedal is strongly depressed (high acceleration)
- The steering wheel is turned heavily
- The brake pedal is depressed
- The turn signal lever is operated
- The driver actively turns the steering wheel in the opposite direction of system operation
When System Cannot Operate:
- Turn signal lights are flashing
- VSC (Vehicle Stability Control) OFF indicator is illuminated
Source: Page 259
---
5. Intersection Collision Avoidance Support (Left/Right Turn)
Function Description:
When turning left or right at an intersection and the system detects oncoming traffic, pedestrians, or bicycles in the vehicle's path, the system provides collision warnings and automatic braking assistance.
Activation Scenarios:
- When turning left/right at an intersection and crossing the path of an oncoming vehicle
- When turning left/right and a pedestrian or bicycle is detected in the intersection
Operating Speed Ranges:
| Detectable Object | Vehicle Speed | Oncoming Speed | Relative Speed |
|---|---|---|---|
| Oncoming vehicles | 3-25 mph (5-40 km/h) | 3-45 mph (5-75 km/h) | 7-70 mph (10-115 km/h) |
| Pedestrians | 3-20 mph (5-30 km/h) | N/A | 3-25 mph (5-40 km/h) |
| Bicycles | 3-20 mph (5-30 km/h) | N/A | 3-30 mph (5-50 km/h) |
Important: Depending on the specific intersection geometry and conditions, assistance may not operate correctly. Drivers should always follow traffic rules and visually confirm safety before turning.
Source: Pages 259-260
---
6. Intersection Collision Avoidance Support (Crossing Vehicles)
Function Description:
At intersections and similar locations, when the system detects an approaching vehicle or motorcycle crossing the vehicle's path, the system provides collision warnings and automatic braking.
How It Works:
- Monitors for vehicles or motorcycles approaching from cross-traffic directions
- Evaluates collision probability based on vehicle speeds and trajectories
- Provides pre-collision warning when collision risk is high
- Applies pre-collision braking to help avoid collision or reduce impact
Operating Speeds (vehicles and motorcycles crossing from the side):
| Crossing Vehicles/Motorcycles | Vehicle Speed | Crossing Speed | Relative Speed |
|---|---|---|---|
| Side approach | 3-38 mph (5-60 km/h) | Your vehicle speed or less | 25 mph or less (40 km/h or less) |
Important: System operation depends on intersection geometry. Assistance may not operate correctly in all intersection types.
Source: Page 260
---
7. Acceleration Suppression at Low Speed
Function Description:
When driving at low speeds, if the driver depresses the accelerator pedal strongly while the system detects a collision possibility, the system restricts engine output and may apply light braking to prevent unintended acceleration into an obstacle.
Applicable Vehicles: This feature operates on automatic transmission vehicles. Manual transmission vehicles do not have this function.
How It Works:
- System monitors accelerator pedal pressure at low speeds
- When strong acceleration is detected and collision risk exists
- Engine output is restrained
- Light braking may be applied to restrict acceleration
- Helps prevent accidents caused by pedal confusion (acceleration instead of braking)
Driver Alerts:
- A buzzer sounds when the function activates
- A warning indicator appears on the instrument cluster
- A message displays on the multi-information display: "Accelerator Pedal is Pressed"
Operating Speed Range: This function operates at 0-9 mph (0-15 km/h) with objects at all relative speeds within this range.
Source: Pages 261-262
---
8. Suspension Control (Adaptive Variable Suspension)
Function Description:
For vehicles equipped with Adaptive Variable Suspension, when the system determines a collision is high probability, the system controls shock absorber damping to optimize vehicle posture and help maintain stability.
How It Works:
- System coordinates with collision detection signals
- Controls the damping force of shock absorbers in real-time
- Adjusts suspension stiffness to improve vehicle stability
- Works during pre-collision scenarios to help vehicle maintain optimal posture
Note: This feature is only available on vehicles equipped with Adaptive Variable Suspension system.
Source: Page 263
---
System Limitations and Detection Challenges
Understanding Detection
How the System Detects Objects:
Objects are detected based on their size, shape, and movement. The system relies on front-mounted sensors that continuously scan the road ahead.
Important Factor: Depending on the ambient brightness, movement, posture, and direction of a detectable object, it may not be detected and the system may not operate properly. Lighting conditions significantly impact detection reliability.
Why Relative Speed Differential Matters:
The PCS system requires a relative speed differential between your vehicle and the detected object to trigger reliably. Simply approaching a stationary object may not activate the system—the system calculates speed differences, not just proximity. This is why the system activates more predictably at higher speeds (above 32 mph) where speed differential is clearer.
Source: Page 261, Manual + TacomaWorld.com community research
---
Situations Where System May Over-Detect (False Positives)
The system may determine that collision risk is high and operate even though an actual collision is not likely in these situations:
- When passing a detectable object
- When changing lanes while overtaking a detectable object
- When suddenly approaching a detectable object
- When approaching a detectable object or other objects on the roadside (guardrails, utility poles, trees, walls)
- When there is a detectable object or other object by the roadside at the entrance of a curve
- When there are patterns or painting ahead that may be mistaken for a detectable object
- When passing a detectable object that is changing lanes or turning left/right
- When passing a stopped detectable object preparing to make a left/right turn
- When a detectable object stops immediately before entering the vehicle's path
- When passing through locations with structures above the road (traffic signs, billboards)
- When approaching electric toll gates, parking barriers, or other opening/closing barriers
- When turning left/right and oncoming traffic, pedestrians, or bicycles cross in front
- When attempting to turn left/right in front of oncoming traffic, pedestrians, or bicycles
- When turning left/right and oncoming traffic, pedestrians, or bicycles stop or change course before entering the path
- When turning left/right and oncoming vehicles turn left/right in front of the vehicle
- When the steering wheel is operated toward the path of an oncoming vehicle
- When there is an object moving above or under the road
Source: Page 261
---
Situations Where System May Not Detect (False Negatives)
The system may fail to detect a detectable object and not operate properly in these situations:
General Detection Failures:
- When a detectable object is approaching the vehicle
- When the vehicle or detectable object is wandering (changing lane position)
- When a detectable object makes an abrupt maneuver (sudden swerving, acceleration, deceleration)
- When suddenly approaching a detectable object
- When the detectable object is near a wall, fence, guardrail, manhole cover, steel plate, or another vehicle
- When there is a structure above a detectable object
- When part of a detectable object is hidden by another object (large luggage, umbrella, guardrail)
- When multiple detectable objects are overlapping
- When a bright light (such as the sun) is reflecting off a detectable object
- When a detectable object is white and looks extremely bright
- When the color or brightness of a detectable object causes it to blend in with surroundings
- When a detectable object cuts in front of or suddenly emerges in front of the vehicle
- When approaching a vehicle that is diagonal to your vehicle's path
Pedestrian-Specific Non-Detection:
- If a pedestrian is shorter than approximately 3.2 feet (1 meter) or taller than approximately 6.5 feet (2 meters)
- When the silhouette of a pedestrian is unclear (wearing raincoat, long skirt, bulky clothing)
- When a pedestrian is bending forward or squatting
- When a pedestrian is moving at high speed
- When a pedestrian is pushing a stroller, wheelchair, bicycle, or other vehicle
- When a detectable object blends in with the surrounding area (dim at dawn/dusk, dark at night/in tunnel)
Bicycle-Specific Non-Detection:
- If a bicycle is a child-sized bicycle
- If a bicycle is carrying a large load
- If a bicycle is carrying an extra passenger
- If a bicycle is being ridden with a forward-leaning posture
- If a bicycle has an unusual shape (child seat equipped, tandem bicycles)
- When a bicycle is moving at high speed
Timing-Related Non-Detection:
- When the vehicle has not been driven for a certain amount of time after the engine was started
- While turning left/right or a few seconds after turning
- While driving around a curve and a few seconds after driving around a curve
- When turning left/right and an oncoming vehicle is driving in a lane 3 or more lanes away
- When turning left/right and the direction of vehicle traffic differs greatly from the traffic flow direction
- When turning left/right and a pedestrian or bicycle behind the vehicle comes in front (as if overtaking)
- When at an intersection, the approaching crossing vehicle is very long (large truck, towing trailer)
Emergency Steering Assist Specific Limitations:
- When a detectable object is too close to the vehicle
- When there is insufficient space to perform evasive steering maneuvers
- When an obstruction exists in the evasion direction
- When there is an oncoming vehicle
Wall Detection Limitations (Automatic Transmission Vehicles):
- When scenery behind the wall is visible (glass door, grid fence)
- When the wall is slanted or low
- When the wall is narrow (such as a pole)
- When the wall is made of plants (hedge)
- When the road is reflected on the wall
- When the vehicle is approaching the wall at an angle
Source: Pages 261-262
---
General Operating Conditions
When System Cannot Operate
The Pre-Collision System will not operate in the following situations, regardless of collision risk:
- When the PCS is disabled through the customization settings
- When the shift lever is in Reverse (R)
- When the vehicle has not been driven a certain amount after a battery terminal has been disconnected and reconnected
- When turn signal lights are flashing (for certain functions)
- When VSC OFF indicator is illuminated (Emergency Steering Assist)
Source: Page 262
---
Driver Input Override
The system monitors driver inputs and will not operate or will cancel operation when the system determines the driver is taking independent evasive action:
- When the accelerator pedal is strongly depressed (indicates driver is accelerating)
- When the steering wheel is operated heavily or suddenly (indicates active steering input)
- When the brake pedal is depressed (indicates driver is already braking)
- When the turn signal lever is operated (indicates intentional turning)
Rationale: The system is designed to assist the driver, not override driver decisions. When the system detects that the driver is actively controlling the vehicle, it backs away to prevent conflicting control inputs.
Source: Page 262
---
Configuration and Customization
Accessing PCS Settings
The Pre-Collision System can be enabled/disabled and warning timing can be adjusted through the vehicle's customization settings. Settings are accessed through the vehicle's multi-information display.
Location: Customization settings (refer to page 643 in the owner's manual for navigation details)
Important: All PCS settings are reset to defaults each time the engine switch is turned ON. Settings modified through customization are persistent and will be applied at the next engine start.
Source: Page 643
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Available Settings
| Setting | Options | Default |
|---|---|---|
| Pre-Collision System | ON / OFF | ON |
| Warning Timing | Later / Default / Earlier | Default |
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Setting Descriptions
Pre-Collision System (ON/OFF):
- ON: System is active and will monitor for collisions
- OFF: System is completely disabled; no warnings, no braking assistance
Warning Timing (Later/Default/Earlier):
- Earlier: Warning triggers at greater distance from potential collision (more conservative)
- Default: Standard warning timing based on typical collision response scenarios
- Later: Warning triggers at shorter distance from potential collision (more aggressive)
Note: The Earlier setting provides more warning time but may increase false positive alerts. The Later setting reduces alerts but provides less reaction time.
Source: Page 643
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Sensor Calibration and Maintenance
The TSS 3.0 forward-facing camera mounted behind your windshield requires professional recalibration after any windshield service, collision repair, or major front-end work. This is a critical maintenance step, not optional.
When Calibration is Required:
- Windshield replacement or repair
- Front-end collision damage
- Major suspension or steering repairs
TSS Calibration Before Lift Installation:
If you're planning to lift your 4th Gen Tacoma and will need windshield replacement, schedule TSS calibration while the vehicle is still at stock height. This ensures the forward-facing camera and radar sensors are calibrated correctly before suspension modifications alter sight lines.
Source: 4GTaco.com community research
Cost Expectations: Recalibration typically costs $300-500 and is covered under warranty after accidents. This is cheaper than collision damage and essential for system reliability.
Warranty Coverage for TSS Diagnostics:
TSS system diagnostics and verification are free during the 3-year/36,000-mile basic warranty. Dealers should not charge diagnostic fees for investigating PCS indicators. If a dealer attempts to charge for TSS diagnostics, request warranty coverage.
Source: 4GTaco.com, ToyotaNation.com community research
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Real-World Performance and Practical Use
Low-Speed Maneuver Effectiveness
Real owners report that Pre-Collision Brake Control is particularly useful during low-speed maneuvering, such as slowly pulling into a tight garage. The automatic braking assistance helps prevent accidental impacts in confined spaces where human reaction time might be slower.
Source: ToyotaNation.com community research
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Stop-and-Go Traffic Performance
The TSS 3.0 system, including PCS, performs well in urban and city driving with frequent stops. The dynamic radar cruise control and pre-collision warning work together effectively in stop-and-go traffic patterns common in metropolitan areas.
Source: ToyotaNation.com community research
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Common Mistakes to Avoid
Misunderstanding Detection Distance as a Safety Problem:
Some owners report PCS activating at approximately 4-5 feet from obstacles, and interpret this as a system malfunction. This is normal operation—the system is designed to activate at distances that allow emergency braking to be effective, not at excessive distances. Dealer recalibration attempts usually confirm the system is working correctly. Understanding normal behavior prevents unnecessary dealer visits and expensive troubleshooting.
Source: TacomaWorld.com
Ignoring Windshield Replacement Calibration Requirements:
The TSS 3.0 camera mounted behind the windshield requires professional recalibration after any windshield service. Skipping this step can result in unpredictable PCS behavior including false positives or failures to detect genuine threats.
Source: 4GTaco.com
Relying on PCS for Daily Driving Safety Instead of Active Attention:
The system functions as an emergency collision-reduction feature, not a daily driving aid. Owners expecting the system to be a "safety net" for inattentive driving experience excessive false alerts. The system works best when combined with attentive driving.
Source: TacomaWorld.com
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Source Attribution
Owner's Manual Pages:
- System overview and detection: Pages 253-254
- Core functions and safety warnings: Pages 255-262
- Configuration settings: Page 643
Additional Sources:
- TacomaWorld.com - Owner forums discussion
- 4GTaco.com - TSS indicator guide
- ToyotaNation.com - TSS 3.0 owner experiences
- 4thgentacoma.com - TSS discussion threads
Disclaimer:
This guide is derived from the official 2024+ Toyota Tacoma Owner's Manual with supplementary information from the owner community and authoritative sources. Always follow your official owner's manual for warranty compliance. This is a reference guide only. Driving safely is solely the responsibility of the driver.
