NAV. Communication Line Circuit Troubleshooting

WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect navigation unit connector A (20P).
Disconnect the climate control unit 30P connector.

Check for continuity between the following terminals of the climate control unit 30P connector and navigation unit connector A (20P).

CLIMATE CONTROL UNIT 30P CONNECTOR AND NAVIGATION UNIT CONNECTOR A (20P)

30P	20P
No. 6	No. 15
No. 17	No. 14
No. 24	No. 4

Fig 1: Checking Continuity Between Terminals Of Climate Control Unit 30P Connector And Navigation Unit Connector A (20P)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 4.
NO - Repair any open in the wire(s) between the climate control unit and the navigation unit.

Check for continuity between body ground and the climate control unit 30P connector terminals No. 6, 17 and 24 individually.

Fig 2: Checking Continuity Between Body Ground And Climate Control Unit 30P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair any short to body ground in the wire(s) between the climate control unit and the navigation unit.
2. NO - Check for loose wire or poor connections at the climate control unit 30P connector and at the navigation unit connector A (20P). If the connections are good, substitute a known-good climate control unit and/or navigation unit, and recheck. If the symptom/indication goes away, replace the original climate control unit and/or navigation unit.