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 (PSB), the seat belt is retracted by a motor upon receiving a signal from the pre-collision sensor (Front center millimeter wave radar sensor + driving support ECU + object recognition ECU) and skid control ECU, to optimize the restraint performance.
* The skid control ECU sends the trigger signal to the seat belt control ECU through CAN communication when it detects certain vehicle conditions such as a vehicle spin, under-steer or sudden braking. The seat belt control ECU operates the PSB upon receiving the signal.
* The pre-collision sensor detects on-coming vehicles and objects which are on the road ahead by using a millimeter wave radar and it also determines in advance whether a collision is unavoidable from information such as the position, speed and oncoming route of the object. The driving support ECU sends a signal to seat belt control ECU through CAN communication to activate the PSB motor to retract the seat belt before a crash. This function works when the vehicle speed is below 5 km/h if the conditions are right.
* If the pre-collision system (PCS) fails, the words 'CHECK PCS SYSTEM' will be shown on the multi information display in the meter. The exclusive PCS warning lamp is then lit up. When the system is not available due to dirt on the radar however, 'PCS NOT AVAILABLE NOW' is displayed instead 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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