Communication Line Circuit Troubleshooting (With Navigation System)

WARNING: This page is about a different car, the 2003 Acura 3.2CL and 2002 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect navigation display unit connector A (5P).
Disconnect climate control unit connector B (20P).

Check for continuity between the following terminals of climate control unit connector B (20P) and navigation display unit connector A (5P).

CLIMATE CONTROL UNIT CONNECTOR B-TO-NAVIGATION DISPLAY UNIT CONNECTOR A CONTINUITY TEST

Climate Control Unit Connector B (20P) Terminal No.	Navigation Display Unit Connector A (5P) Terminal No.
8	2
12	4
14	3

Fig 1: Checking Continuity

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 display unit.

Check for continuity between the body ground and climate control unit connector B (20P) terminals No. 8, 12 and 14 individually.

Fig 2: Checking Continuity Between The Body Ground And Climate Control Unit Connector B (20P) Terminals No. 8, 12 And 14 Individually
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 display unit.
2. NO : Check for loose wires or poor connections at climate control unit connector B (20P) and at navigation display unit connector A (5P). If the connections are good, substitute a known-good climate control unit. If the problem still exists, replace the navigation display unit.