Audio Unit Button(s) Do Not Work
Audio unit button(s) do not workNOTE: If only the XM button is not working. Go to Poor Sound or No Sound With XM Radio.
1. Turn the ignition switch to ON (II).
2. Try several buttons to check function.
Do all buttons work normally?
YES - Intermittent problem. Check for loose or poor connections at the audio unit, the display panel control unit, and the navigation control unit (if equipped).
NO - Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect audio unit connector C (26P) and display panel control unit connector A (14P).
5. Check for continuity between audio unit connector C (26P) terminal C13 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the audio unit and the display panel control unit.
NO - Go to step 6.
6. Check for continuity between audio unit connector C (26P) terminal C26 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the audio unit and the display panel control unit.
NO - If the vehicle is not equipped with navigation, go to step 7. If the vehicle is equipped with navigation, go to step 8.
7. Substitute a known - good audio unit, and retest the function of the buttons.
Do the button operate normally?
YES - Replace the original audio unit.
NO - Replace the display panel control unit.
8. Disconnect navigation control unit connector A (20P) and display panel control unit connector E (22P).
9. Check for continuity between audio unit connector A (20P) terminal No. 10 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the navigation control unit and the display panel control unit.
NO - Go to step 10.
10. Check for continuity between audio unit connector A (20P) terminal No. 20 and body ground.
Is there continuity?
YES - Repair a short to ground in the wire between the navigation control unit and the display panel control unit.
NO - Go to step 11.
11. Check the operation of the navigation display buttons.
Do the navigation buttons operate normally?
YES - Go to step 13.
NO - Go to step 12.
12. Substitute a known-good navigation control unit, and recheck the button operation.
Do the buttons operate normally?
YES - Replace the original navigation control unit.
NO - Go to step 13.
13. Substitute a known-good audio unit, and recheck the button operation.
Do the buttons operate normally?
YES - Replace the original audio unit.
NO - Replace the display panel control unit.