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.
Circuit Description
This circuit supplies power to operate the seat belt control ECU.
Ignition power supply to the seat belt control ECU:
Turn the ignition switch to the ON position to turn the D-IG1 relay on. The driver side J/B ECU supplies power to the luggage room J/B ECU, and the L-IG1 relay turns on to supply power to the seat belt control ECU.
HINT:
There may be a malfunction in the power source circuit if the pre-collision safety system does not operate normally even when both DTCs and normal system codes are not output, or if the normal system code is output and DTCs are not output.
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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.