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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.
Symptoms Of Faulty Wake-Up Communication Line
1998 Acura 3.5RL Special EditionSECTION Symptoms Of Faulty Wake-Up Communication Line
WARNING: This page is about a different car, the 1997 Acura 3.5RL. However, it is still accessible from the selected car via links, so may be relevant.
- An open in a communication line will cause most systems to not operate because one multiplex control unit cannot wake up other multiplex control units. Multiplex control units that are not awake will wake up when a related switch is operated. Turning ignition switch to ON position will wake up all multiplex control units.
- If a communication line is shorted to ground:
- Driver's and passenger's multiplex control units will not wake up except when ignition is in ON position and a wake-up signal from door multiplex control unit is received.
- Driver's multiplex control unit can wake up by a switch operation related to door multiplex control unit, but passenger's multiplex control unit cannot wake up by a switch operation.
- Turning ignition switch to ON position will wake up all multiplex control units.
- If a communication line is shorted to battery voltage:
- Most systems will not operate because one multiplex control unit cannot wake up other multiplex control units.
- Possible blown fuse or a faulty transistor in multiplex control unit.
- One multiplex control unit can wake up from a related switch operation, but other multiplex control units cannot wake up.
- Driver's multiplex control unit can wake up by a switch operation related to door multiplex control unit, but passenger's multiplex control unit cannot wake up by a switch operation.
- Turning ignition switch to ON position will wake up all multiplex control units.
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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.