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
* In the pre-collision seat belt (Hereinafter called PSB), the seat belt is retracted to optimize the restraint performance with the motor by receiving signal from the pre-collision sensor (Front center millimeter wave radar sensor + driving support ECU + object recognition ECU) and skid control ECU.
* Skid control ECU sends trigger signal to seat belt control ECU through CAN communication when detecting certain vehicle conditions such as spin condition, under-steer condition and sudden braking. Seat belt control ECU operates PSB upon receiving the signal.
* Pre-collision sensor detects an on-coming vehicle or object on the road ahead with the millimeter wave radar and determines in advance whether a collision is unavoidable from information such as the position, speed and on-coming route of the object. The driving support ECU sends signal to seat belt control ECU through CAN communication to activate PSB motor to retract the seat belt before a crash. This function works when the vehicle speed is above 5 km/h if conditions are right.
* When the pre-collision system (Hereinafter called PCS) has failure, 'CHECK PCS SYSTEM' is shown on the multi information display in the meter. The warning lamp exclusively for PCS is lit up then. When the system is not available due to dirt on the radar, 'PCS NOT AVAILABLE NOW' is displayed and the warning lamp blinks.
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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.
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