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 Closure Motor
- CHECK BACK DOOR CLOSURE MOTOR
- Turn ignition switch OFF.
- Check the signal between back door closure control unit connector and ground with oscilloscope.CONNECTOR TERMINAL VOLTAGE REFERENCE
Connector Terminals (Wire color) Back door condition Signal (Reference value) (+) (-) D106 2 (PU) Ground Fully closed --> fully open 3 (G) Fully open --> fully closed
OK or NG
OK : GO TO 2.
NG : Replace back door closure control unit.
- CHECK HARNESS CONTINUITY
- Disconnect back door closure control unit and back door closure motor connector.
- Check continuity between back door closure control unit connector D106 terminals 2, 3 and back door closure motor connector D109 terminals 1, 2.
2 (PU) - 1 (PU) : Continuity should exist.
3 (G) - 2 (G) : Continuity should exist.
- Check continuity between back door closure control unit connector D106 terminals 2, 3 and ground.
2 (PU) - Ground : Continuity should not exist.
3 (G) - Ground : Continuity should not exist.
OK or NG
OK : Replace back door closure motor.
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.