Audio Communication Line Circuit Troubleshooting
Audio Communication Line Circuit Troubleshooting1. Turn the ignition switch to LOCK (0).
2. Disconnect climate control unit connector A (28P) and the audio-HVAC subdisplay or display unit 12P connector.
3. Check for continuity between the following terminals of climate control unit connector A (28P) and the audio-HVAC subdisplay or display unit 12P connector.
Is there continuity?
YES - Go to step 4.
NO - Repair open in the wire between climate control unit connector A (28P) and the audio-HVAC subdisplay or display unit 12P connector.
4. Check for continuity between body ground and climate control unit connector A (28P) No. 19 and No. 20 terminals individually.
Is there continuity?
YES - Repair short to body ground in the wire between climate control unit connector A (28P) and the audio-HVAC control unit 12P connector.
NO - Go to step 5.
5. Reconnect climate control unit connector A (28P).
6. Connect the audio-HVAC subdisplay or display unit 12P connector No. 7 and No. 8 terminals with a jumper wire.
7. Turn the ignition switch to ON (II).
8. Press and hold the DEF button and OFF button.
Is the DEF button LED blinking?
YES - Audio-HVAC subdisplay unit or display unit is faulty, replace the audio-HVAC subdisplay unit or audio-HVAC display unit.
NO - Climate control unit is faulty, replace the climate control unit.