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.
2005 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Terminals Of Ecu
- SEAT BELT CONTROL ECUΒ SEAT BELT CONTROL ECU - REFERENCE TABLE
Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Value S63-1 (MOR+) -S63-18 (PGND) R - W-B Seat belt motor RH power source line Ignition switch ON 4.0 to 8.5 V S63-2 (MOL+) -S63-18 (PGND) W - W-B Seat belt motor LH power source line Ignition switch ON 4.0 to 8.5 V S63-3 (IG1) - Body ground GR -Body ground Seat belt control ECU power source line Ignition switch ON 10 to 14 V S63-4 (CANH) - Body ground - CAN communication Engine idling Pulse generation S63-6 (CANL) - Body ground - CAN communication Engine idling Pulse generation S63-7 (SIL) Y Diagnosis check Check if communication is available using a hand-held tester Communication is available S63-9 (+B) - Body ground B - W-B Seat belt control ECU power source line Always 10 to 14V S63-10 (MOR-) - Body ground G - Body ground Seat belt motor RH ground line Ignition switch ON 4.0 to 8.5 V S63-11 (MOL-) - Body ground L - Body ground Seat belt motor LH ground line Ignition switch ON 4.0 to 8.5 V S63-18 (PGND) - Body ground W-B -Body ground Seat belt control ECU ground line Always Below 1 Ξ©
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.