Toyota Pre-Collision System Malfunction (See How To Fix It) | Welding body (2023)

A Toyota vehicle is a pleasure to drive, as it offers reliability and advanced safety features. One such safety feature is the Pre-Collision System (PCS), which is designed to help detect potential collisions and take proactive measures to avoid or mitigate them.

However, like any technology, PCS can occasionally fail, causing drivers to worry.

Here are some steps to follow to fix a pre-collision system malfunction in Toyota vehicles, which include:

Step 1: Reset the vehicle

Step 2: Reset or calibrate the system before the crash

Step 3: Inspect the sensors

Step 4: Reset the electronic systems

Step 5: Check the ABS and airbag sensors

Step 6: Seek professional help

In this comprehensive guide, we'll explore the causes of Toyota pre-crash system failures, how to fix them, and how to prevent them from happening in the first place.

Understanding the system before it crashes

Before diving into the causes and fixes of a malfunctioning pre-crash system, it is essential to understand what this system does and how it works.

PCS is part of Toyota's Safety Sense package, which includes a variety of safety features designed to protect drivers, passengers, pedestrians and other road users.

The Pre-Collision with Pedestrian Detection (PCS w/PD) system uses a combination of radar and camera technology to detect potential collisions with vehicles, pedestrians and in some cases, bicyclists and motorcyclists.

When the system detects a potential collision, it provides audible and visual warnings to alert the driver. If the driver takes no action to avoid a collision, the system can automatically apply the brakes to prevent a collision or reduce its impact.

Causes of pre-crash system failure

There are many possible causes of PCS failure, including:

  1. Dirty or clogged sensors:If the front radar sensor, sensor cover, or camera becomes dirty or clogged, the system will not be able to accurately detect potential collisions, resulting in a malfunction.
  2. Technical errors or software problems:Like any computer technology, PCS can have software or programming problems that can cause the system to malfunction.
  3. Misaligned or separated parts:If the PCS components are not properly calibrated or disconnected, the system may not accurately scan the road, which may lead to malfunctions.
  4. Damaged parts:If any hardware component of the PCS becomes damaged or worn out over time, the system may stop working properly.
  5. Vehicle Stability Control (VSC):If the VSC system has been disabled by the driver or a malfunction has occurred, the PCS may not operate properly.
  6. Defective ABS or airbag sensor:If there is a problem with the anti-lock braking system (ABS) or airbag speed sensor, or if the ABS pump is faulty, this can also cause the PCS to fail.

How to fix pre-collision system failure for Toyota?

If you have a PCS failure, follow these steps to diagnose and resolve the problem:

Step 1: Reset the vehicle

First, try resetting the vehicle by turning off the engine, waiting about 10 minutes, and then turning it back on. This simple step can sometimes fix minor problems and recalibrate the system.

Step 2: Reset or calibrate the system before the crash

If the problem persists, consider resetting or recalibrating the PCS. This can be done by accessing the system settings via the vehicle's multi-information display and following these steps:

  1. Locate the gauge control switch on the steering wheel.
  2. Press the UP or DOWN button until the Settings menu appears on the main multi-information screen.
  3. Using the LEFT or RIGHT button, scroll through the menus and find the Pre-Collision System feature.
  4. Press and hold the OK button for 2 seconds to enter the system settings menu.
  5. Inside the settings menu, press the OK button again to disable the Pre-Crash System.
  6. Repeat these steps to turn the system back on after waiting at least 10 minutes.

Step 3: Inspect the sensors

If the PCS still does not work properly, check for sensor problems. Make sure they are properly installed, clean and free of obstructions.

If you have installed an additional rack or lift kit, these may cause the sensor to misalign and require recalibration.

Step 4: Reset the electronic systems

If the problem persists, try resetting all the electronics in the vehicle by disconnecting the battery and reconnecting it after a few minutes.

While doing this, check the wiring for damage, loose connections or blown fuses.

Step 5: Check the ABS and airbag sensors

Check the ABS and airbag sensors to make sure they are working properly and accurately detecting vehicle speed.

This task can be difficult to perform on your own, so consider consulting with a professional if necessary.

Step 6: Seek professional help

If you cannot solve the problem yourself, it is best to consult a professional mechanic or Toyota dealer. They can accurately diagnose the problem and perform any necessary repairs or recalibration to get your computer back to working order.

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Preventing system failures before a crash

While it is important to know how to fix PCS failures, prevention is always better than cure. Here are some tips to prevent PCS failures:

  1. Keep the sensors clean:Clean the front radar sensor, sensor cover and camera regularly to ensure they can accurately detect potential collisions.
  2. Avoid subsequent modifications:Avoid installing aftermarket racks or lift kits that could cause sensor misalignment or other PCS problems.
  3. Perform routine maintenance:Schedule regular maintenance and inspections for your Toyota vehicle to identify and fix potential problems early.
  4. Software update:Keep your vehicle's software up-to-date as manufacturers may release updates to address known issues or improve system performance.
  5. Consult an expert:If you notice any warning signs or experience difficulty with PCS, seek professional help immediately to diagnose and resolve the problem.

Frequently asked questions

Can I drive my Toyota with a pre-crash system failure?

While a faulty PCS may not directly affect the drivability of your vehicle, it could compromise your safety. It is imperative to resolve the PCS failure as soon as possible to reduce the risk of being involved in a crash.

At what speeds does the system operate before the crash?

The pre-collision system is most effective at detecting vehicles and automatically braking when the car is traveling between 7 and 110 mph.

At lower speeds, the system may have trouble determining whether a collision is likely.

What is the minimum speed for Toyota's pre-crash system?

The minimum speed for Toyota's pre-collision system is approx6,2 mph. However, the pre-collision system in Toyota Safety Sense-P can detect pedestrians at speeds in between6,2 mphdo49,7 mph.

Where are the pre-crash system sensors located?

The front radar sensor is usually located behind the radiator grille or under the Toyota badge, while the camera is usually located in the middle of the windshield, either on the back of the interior mirror or at the bottom of the windshield.

Where is the pre-collision assist sensor located?

The location of the pre-collision assist sensor on the 2019 Ford F-150 has not been determined. However, [3] states that the 2020 Ford F-150 pre-collision assist sensor is located on the front fascia.

It is important to note that any malfunctioning Pre-Collision System (PCS) should be addressed by an authorized dealer and although it is possible to disable or adjust the sensitivity of the PCS in Toyota and Ford vehicles, this is not recommended as it may lead to safety issues and fail to prevent a crash.

Can you drive with a pre-crash system failure?

No, it is not recommended to drive a vehicle with a malfunctioning system prior to a crash. If the system is not working properly, it may not be able to detect potential collisions, which could lead to accidents and injuries.

In the case of Lexus vehicles, if the pre-collision system is not working properly, it is recommended that the vehicle not be driven until the problem is resolved by an authorized dealer.

However, it is important to note that the pre-collision system is designed as a safety feature, and disabling or adjusting its sensitivity in any way can lead to safety issues and possible crashes.

How much does a crash sensor cost?

The cost to repair minor damage to front or rear ultrasonic sensors used with park assist systems can range from $500 to $1,300.

Additionally, after a minor collision, advanced safety systems such as blind spot monitoring, automatic emergency braking, and lane departure warning can double the cost of repairs, which can range from $500 to $3,000, depending on the model and type of sensors and their location.

Failure of Toyota's pre-collision system:Ideas on what the problem could be>>Watch the video below:


Toyota's Pre-Collision System is an important safety feature designed to prevent or mitigate crashes. However, like any other technology, it can break down from time to time due to various factors, such as dirty sensors, software problems or damaged components. By following the steps outlined in this guide, you can diagnose and correct a PCS malfunction and ensure that your vehicle remains safe and reliable. Regular maintenance and inspections can prevent breakdowns and keep your Toyota running flawlessly for years to come.

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