Navigation Communication Line Circuit Troubleshooting

Disconnect navigation unit connector A (20P) ('07 model) or connector A (32P) ('08-10 models).
Disconnect the climate control unit 30P connector.

Check for continuity between the following terminals of the front climate control unit 30P connector and navigation unit connector A (20P) ('07 model) or connector A (32P) ('08-10 models).

'07 model

CONNECTOR TERMINALS REFERENCE

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

Fig 1: Identifying Continuity Between Terminals Of Front Climate Control Unit 30P Connector And Navigation Unit Connector (07 Model)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

'08-10 models

CONNECTOR TERMINALS REFERENCE

30P	32P
No. 6	No. 21
No. 17	No. 20
No. 24	No. 4

Fig 2: Identifying Continuity Between Terminals Of Front Climate Control Unit 30P Connector And Navigation Unit Connector (08-09 models)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 4.

NO - Repair open in the wire(s) between the front climate control unit and the navigation unit.

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

Fig 3: Identifying Continuity Between Body Ground And Front Climate Control Unit 30P Connector No. 6, 17, And 24 Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short to body ground in the wire(s) between the front climate control unit and the navigation unit.

NO - Check for loose wire or poor connections at the front climate control unit 30P connector and at the navigation unit connector A (20P) ('07 model) or connector A (32P) ('08-10 models). If the connections are good, substitute a known-good front climate control unit and/or navigation unit, and recheck. If the symptom/indication goes away, replace the original front climate control unit and/or navigation unit.