Navigation Communication Line Circuit Troubleshooting
Navigation Communication Line Circuit Troubleshooting
1. Operate the climate control system in several modes.
Is the climate control system OK?
YES -
Go to step 2.
NO -
Do the Self-Diagnostic Function with the HDS How to Troubleshoot the Climate Control System or the climate control unit How to Troubleshoot the Climate Control System.�
2. Do the System Links in navigation System Diagnostic Mode Navigation System Diagnostic Mode.
Is the A/C icon red?
YES -
Go to step 3.
NO -
Disconnect navigation unit connector B (32P), then go to step 9.
3. Turn the ignition switch to LOCK (0).
4. Disconnect navigation unit connector B (32P).
5. Disconnect climate control unit connector B (12P).
6. Check for continuity between the following terminals of climate control unit connector B (12P) and navigation unit connector B (32P).
Is there continuity?
YES -
Go to step 7.
NO -
Repair an open in the wire(s) between the climate control unit and the navigation unit.�
7. Check for continuity between body ground and climate control unit connector B (12P) terminals No. 7, No. 8, and No. 9 individually.
Is there continuity?
YES -
Repair a short to body ground in the wire(s) between the climate control unit and the navigation unit.�
NO -
Go to step 8.
8. Reconnect climate control unit connector B (12P).
9. Connect navigation unit connector B (32P) terminals No. 4, No. 20, and No. 21 with jumper wires.
10. Press and hold both the AUTO button, then press and hold the OFF button ('08-09 models) or ON/OFF button ('10-11 models), then turn the ignition switch to ON (II).
11. Check the mode indicator displaying in the audio-HVAC subdisplay unit.
Is the HEAT/VENT indicator solid with the remaining icons blinking?
YES -
Do the Unit check with the navigation system Navigation System Diagnostic Mode.�
NO -
Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit Climate Control Unit Removal/Installation (With Navigation).�