Audio Remote Switch Does Not Work Properly

Audio Remote Switch Does Not Work Properly

NOTE:
- On vehicles with navigation, audio button operation can be checked by doing the hard key status test in the navigation unit check screen. See navigation diagnosis mode. System Diagnostic Mode
- Check the vehicle battery condition first.
- Check the connectors for poor connections or loose terminals.

1. Test the audio remote switch.

Is the audio remote switch OK?

YES - Go to step 2.

NO - Replace the audio remote switch.

2. Turn the ignition switch to ON (II).
3. Turn on the audio unit and check the audio unit operation (volume up, volume down, CH (+), CH (-), MODE).

Is the audio unit operation OK?

YES -
- With navigation: Go to step 4.
- Without navigation: Go to step 7.

NO -
- With navigation: Replace the navigation unit.
- Without navigation: Replace the audio unit.

4. Remove the navigation unit.
5. Measure the resistance between navigation unit connector B (22P) No. 6 and No. 7 terminals as specified in the table.






Is the resistance OK?

YES - Go to step 6.

NO - Repair open or high resistance in the circuit between the navigation unit and the audio remote switch. If the wires are OK, replace the cable reel.

6. Check for continuity between the No. 6 and No. 7 terminals of navigation unit connector B (22P) and body ground.






Is there continuity?

YES - Repair short to body ground in the circuit between the navigation unit and the audio remote switch. If the wires are OK, replace the cable reel.

NO - Replace the navigation unit.

7. Remove the audio unit.
8. Measure the resistance between audio unit connector B (20P) No. 6 and No. 7 terminals as specified in the table.






Is the resistance OK?

YES - Go to step 9.

NO - Repair open or high resistance in the circuit between the audio unit and the audio remote switch. If the wires are OK, replace the cable reel.

9. Check for continuity between the No. 6 and No. 7 terminals of audio unit connector B (20P) and body ground.






Is there continuity?

YES - Repair short to body ground in the circuit between audio unit and the audio remote switch. If the wires are OK, replace the cable reel.

NO - Replace the audio unit.