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 or the climate control unit.
2. Do the system links.
Is the A/C or Mic icon red?
YES -
- If A/C icon is red, go to step 3.
- If Mic icon is red, go to "voice control does not work/respond" in the navigation system symptom troubleshooting Symptom Troubleshooting.
NO -
Go to step 8.
3. Turn the ignition switch to LOCK (0).
4. Disconnect audio-navigation unit connector D (20P).
5. Disconnect climate control unit connector B (12P).
6. Check for continuity between the following terminals of climate control unit connector B (12P) and audio-navigation unit connector D (20P).
Is there continuity?
YES -
Go to step 7.
NO -
Repair an open in the wire(s) between the climate control unit and the audio-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 audio-navigation unit.
NO -
Reconnect the climate control unit connector B (12P), then go to step 9.
8. Turn the ignition switch to LOCK (0).
9. Connect the audio-navigation unit connector D (20P) terminals No. 4, No. 5, and No. 14 with jumper wires.
10. Turn the ignition switch to ON (II).
11. Press and hold the AUTO and ON/OFF buttons, then turn the ignition switch to ON (II).
12. Check the mode indicator displaying in the audio-navigation switch panel display.
Is the HEAT/VENT indicator solid with the remaining icons blinking?
YES -
Substitute a known-good audio-navigation unit (including the HDD), and recheck. If the symptom goes away, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.
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.