NAV. Communication Line Circuit Troubleshooting

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).

CONNECTOR TERMINAL CHART (8 OF 8)

30P	20P
No. 24	No. 4
No. 25	No. 15
No. 26	No. 14

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

G03690962

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. 24, 25, and 26 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 wires 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.