Navigation Communication Line Circuit Troubleshooting
Navigation Communication Line Circuit Troubleshooting1. 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 climate control unit.
2. Do the Navi system link.
Is the Air-Con or TALK/BACK icon red?
YES
- If Air-con icon is red, go to step 3.
- If TALK/BACK icon is red, go to "voice control does not work/respond" Voice Control Does Not Work/Respond in the navigation system symptom troubleshooting.
NO - Go to step 9.
3. Turn the ignition switch to LOCK (0).
4. Disconnect navigation unit connector A (20P).
5. Disconnect the climate control unit connector B (16P).
6. Check for continuity between the following terminals of the climate control unit connector B (16P) and navigation unit connector A (20P).
Is there continuity?
YES - Go to step 7.
NO - Repair open in the wire(s) between the climate control unit and the navigation unit.
7. Check for continuity between body ground and the climate control unit connector B (16P) No. 1, 9 and No. 10 terminals 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.
8. Reconnect the climate control unit connector B (16P).
9. Disconnect navigation unit connector A (20P).
10. Connect the navigation unit connector A (20P) No. 4, 14 and No. 15 terminals with a jumper wire.
11. Turn the ignition switch ON (II).
12. Press and hold the AUTO button, then press and hold the OFF button.
Is the HEAT/VENT indicator solid with the remaining icons blinking?
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.