Audio Unit Button(s) Do Not Work

NOTE: If only the XM button is not working. Go to POOR OR NO SOUND WITH XM RADIO .

Turn the ignition switch to ON (II).
Try several buttons to check function.
Do all buttons work normally?
1. 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).
2. NO - Go to step 3.
Turn the ignition switch OFF.
Disconnect audio unit connector C (26P) and display panel control unit connector A (14P).
Check for continuity between audio unit connector C (26P) terminal C13 and body ground.

Fig 1: Checking Continuity Between Terminal C13 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair a short to ground in the wire between the audio unit and the display panel control unit.
2. NO - Go to step 6.
Check for continuity between audio unit connector C (26P) terminal C26 and body ground.

Fig 2: Checking Continuity Between Terminal C26 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair a short to ground in the wire between the audio unit and the display panel control unit.
2. NO - If the vehicle is not equipped with navigation, go to step 7. If the vehicle is equipped with navigation, go to step 8.
Substitute a known good audio unit, and retest the function of the buttons.
Do the button operate normally?
1. YES - Replace the original audio unit.
2. NO - Replace the display panel control unit.
Disconnect navigation control unit connector A (20P) and display panel control unit connector E (22P).
Check for continuity between audio unit connector A (20P) terminal No. 10 and body ground.

Fig 3: Checking Continuity Between Terminal No. 10 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair a short to ground in the wire between the navigation control unit and the display panel control unit.
2. NO - Go to step 10.
Check for continuity between audio unit connector A (20P) terminal No. 20 and body ground.

Fig 4: Checking Continuity Between Terminal No. 20 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair a short to ground in the wire between the navigation control unit and the display panel control unit.
2. NO - Go to step 11.
Check the operation of the navigation display buttons.
Do the navigation buttons operate normally?
1. YES - Go to step 13.
2. NO - Go to step 12.
Substitute a known-good navigation control unit, and recheck the button operation.
Do the buttons operate normally?
1. YES - Replace the original navigation control unit.
2. NO - Go to step 13.
Substitute a known-good audio unit, and recheck the button operation.
Do the buttons operate normally?
1. YES - Replace the original audio unit.
2. NO - Replace the display panel control unit.