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.
Section 29 (Multiplex Control System): Description
Multiplex control system consists of a driver, passenger, and door multiplex control units. These 3 control units integrate independent control units using multiplex communication lines. See Fig 1 .
Driver's multiplex control unit is located behind driver's side kick panel. Passenger's multiplex control unit is located behind passenger's side kick panel. Door multiplex control unit is located in driver's door and is incorporated in power window master switch.
Multiplex control system includes a multiplex function, wake-up/sleep function, fail-safe function, and a 2-mode self-diagnostic function. Self-diagnostic Mode 1 is used to diagnose multiplex control system. Self-diagnostic Mode 2 is used to diagnose a failure in input line of each system.
Multiplex integrated control system includes engine oil pressure indicator flasher circuit, seat belt reminder circuit, and lights-on and key-in reminder circuits. Other controlled systems include dash illumination brightness control, entry illumination, rear window defogger, trunk opener, power door locks (with keyless entry), power windows (with key-off timer operation), wiper/washers (with speed respondent intermittent wiper), security alarm system and interlock system.
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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.