Shorted Communication Line Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Honda Odyssey, 2003 Honda Odyssey, 2002 Honda Odyssey, 2001 Honda Odyssey, and 2000 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

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 Continuity Between No. 15 Terminal Of Door Multiplex Connector A (20P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES: Repair short to ground in the wire between door multiplex control unit connector A (20P) and the driver's under-dash fuse/relay box.
2. NO: Go to step 6.
Check for continuity between No. 9 terminal of passenger's multiplex connector B (22P) and body ground.

Fig 2: Checking Continuity Between No. 9 Terminal Of Passenger's Multiplex Connector B (22P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES: Repair short to ground in the wire between passenger's multiplex control unit connector B (22P) and driver's multiplex control unit connector B (22P).
2. NO: Replace driver's multiplex control unit and recheck the symptom.