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.
Multiplex Communication Functions
Multiplex control system reduces the number of wire harnesses by sending digital signals over shared multiplex communication lines. A CPU converts input signals from each switch to digital signals, and transmits these as serial signals. Transmitted serial signals from multiplex control units are converted to switch signals for switch operation. There are 3 dedicated communication lines between multiplex control units. From door unit to driver's unit Gray 20-pin connector terminal No. 15 (Brown/Yellow wire), from driver's unit Gray 26-pin connector terminal B9 (Brown/White wire) to passenger's unit, and from passenger's unit to driver's unit Gray 26-pin connector terminal A9 (Red/Yellow wire).
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.