Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System Outline
* The pre-collision seat belt (PSB) can be retracted by a motor to optimize the restraint performance of the seat belt in an emergency. It operates based upon signals from the pre-collision sensors (Millimeter wave radar sensor + distance control ECU) and skid control ECU with actuator.
* The skid control ECU with actuator sends trigger signals to the seat belt control ECU through CAN communication when it detects certain vehicle conditions such as a spin, under-steer or sudden braking. The seat belt control ECU activates the PSB upon receiving these signals.
* The pre-collision sensor detects an on-coming vehicle or object on the road ahead using a millimeter wave radar and uses information from the distance control ECU such as the position, speed and on-coming route of the object to determine in advance whether a collision is unavoidable or not. The distance control ECU also sends signals to seat belt control ECU through CAN communication to activate PSB motor to retract the seat belt before a crash. This function can operate even when the vehicle speed is 0 km/h if the conditions are right.
* If the pre-collision system (Hereinafter called PCS) experiences a malfunction, 'CHECK PCS SYSTEM' is shown in the meter on the multi information display. The warning lamp exclusively for the PCS will then be lit up. If the system is not available, such as when dirt is on the radar, 'PCS NOT AVAILABLE NOW' will be displayed and the warning lamp will blink.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.