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 step 5 in 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 Continuity Between No 15 Terminal Of Door Multiplex Connector A (20P) And 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 Continuity Between B9 Terminal Of Passenger's Multiplex Connector B (22P) And 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.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.