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 function with the HDS (see HOW TO USE THE HDS TO CHECK FOR DTCS ) or climate control unit, (see HOW TO USE THE CLIMATE CONTROL UNIT SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS ). ■
- Do the Navi system link, (see SYSTEM DIAGNOSTIC MODE
)
Is the A/C or TALK/BACK icon red?
YES -
- A/C icon is red, go to step 3.
- If other icon is red, check navigation system error code (DTCs)
NO - Go to step 9
- Turn the ignition switch to LOCK (0).
- Disconnect navigation unit connector B (32P).
- Disconnect climate control unit connector B (20P).
- Check for continuity between the following terminals of climate control unit connector B (20P) and navigation unit connector B (32P).
20P: 32P:
No. 2: No. 4
No. 9: No. 21
No. 10: No. 20
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 climate control unit connector B (20P) terminals No. 2, 9, and No. 10 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 climate control unit connector B (20P).
- Disconnect navigation unit connector B (32P).
- Connect the navigation unit connector B (32P) terminals No. 4, 20, and No. 21 with jumper wires.
- Turn the ignition switch to ON (II).
- 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 (see UNIT CHECK (QUICK CHECK) ). ■
NO - Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ). ■