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.
Check Select Unlock Relay Circuit
- CHECK SELECT UNLOCK CIRCUIT
- Turn ignition switch OFF.
- Disconnect BCM, rear door lock actuator (LH and RH), and passenger side select unlock relay connector.
- Check continuity between BCM connector M4 terminal 50 and passenger side select unlock relay connector M30 terminal 4.
50 (PU) - 4 (PU) : Continuity should exist.
- Check continuity between passenger side select unlock relay connector M30 terminal 4 and ground.
4 (PU) - Ground : Continuity should not exist.
- Check continuity between passenger side select unlock relay connector M30 terminal 3 and rear door lock actuator connector D52 (LH), D72 (RH) terminal 3.
3 (PU) - 3 (PU) : Continuity should exist.
- Check continuity between passenger side unlock relay connector M30 terminal 3 and ground.
3 (PU) - Ground : Continuity should not exist.
OK or NG
OK : Check passenger side select unlock relay.
NG : Repair or replace harness.
NO RELATED
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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.