Climate Control/Navigation Communication Line Circuit Troubleshooting
Operate the climate control system in several modes.
Is the climate control system OK?
YES
-
Go to
Step 2
.
NO
-
Do the
self-diagnostic with the HDS
or the
climate control unit.
■
Do the Navi system link.
Is the Air-Con icon red?
YES
-
Go to
Step 3
.
NO
-
Go to
Step 9
.
Turn the ignition switch OFF.
Disconnect navigation unit connector A (20P).
Disconnect the climate control unit 32P connector.
Check for continuity between the following terminals of the climate control unit 32P connector and navigation unit connector A (20P).
32P:
20P:
No. 5
No. 4
No. 6
No. 14
No. 21
No. 15
Is there continuity?
YES
-
Go to
Step 7
.
NO
-
Repair open in the wire(s) between the climate control unit and the navigation unit.■
Check for continuity between body ground and the navigation unit connector A (20P) terminals No. 4, 14, and 15 individually.
Is there continuity?
YES
-
Repair short to body ground in the wire(s) between the climate control unit and the navigation unit.■
NO
-
Go to
Step 8
.
Reconnect the climate control unit 32P connector.
Disconnect navigation unit connector A (20P).
Connect navigation unit connector A (20P) terminals No. 4, 14, and 15 with a jumper wire.
Turn the ignition switch ON (II).
Press the RECIRCULATION CONTROL and OFF buttons.
Does the RECIRCULATION CONTROL indicator turn on?
YES
-
Do the Unit check with the navigation system.
■
NO
-
Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit .■
