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.
Shorted Communication Line Test
- Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
- Carefully pry off the driver's door switch trim (see FRONT DOOR PANEL REMOVAL/INSTALLATION )
- Disconnect door multiplex connector A (20P).
- Disconnect passenger's multiplex control unit connector B (22P).
- Check for continuity between No. 15 terminal of door multiplex connector A (20P) and body ground.Fig 1: Checking For Continuity Between No. 15 Terminal Of Door Multiplex Connector A (20P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
- YES -Repair short to ground in the wire between door multiplex control unit connector and body ground.
- NO -Go to step 6.
- Check for continuity between B9 terminal of passenger's multiplex connector B (22P) and body ground.Fig 2: Checking For Continuity Between B9 Terminal Of Passenger's Multiplex Connector B (22P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
- YES -Repair short to ground in the wire between passenger's multiplex control unit connector and driver's multiplex control unit connector.
- NO -Replace driver's multiplex control unit and recheck the symptom.
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.
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