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.
Door Multiplex Control Unit
Remove driver's door trim panel to gain access to door multiplex control unit connector. Turn ignition off. Disconnect door multiplex control unit 20-pin harness connector. See Fig 1 . Check connector terminals and contacts. Repair as necessary and retest system. If connector terminals and contacts are okay, perform input tests. If test results are as specified, perform testing procedure on passenger's multiplex control unit. See PASSENGER'S MULTIPLEX CONTROL UNIT .
Use the Manual With the Right Hardware
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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.