Audio System Symptom Troubleshooting - Poor or no sound with XM radio (Audio unit does display XM channels)
Poor or no sound with XM radio (Audio unit does display XM channels)
NOTE:
Check the vehicle 12 volt battery condition first.
Check the radio reception in an open area. Poor reception/interference can be caused by tall buildings, mountains, or high-voltage power lines are nearby.
If you can only tune to channel 000, 001, and 174, make sure the XM radio is set to channel mode (see the Owner's Manual), if it is set to channel mode, call XM Radio customer support at 800-852-9696, and check the account activation status.
Check the connectors for poor connections or loose terminals.
1.
Problem verification:

Problem verification
?1.
Park the vehicle outside with a clear view of the southern horizon.

?2.
Turn the vehicle to the ON mode.

?3.
Turn on the audio system, and select the XM radio.

?4.
Set the proper XM radio station.

Does the XM radio play?

     
YES
     
     
     
Intermittent failure, the system is OK at this time.?
     
NO
     
     
     
The failure is duplicated, go to step 2.
2.
Shorted wire check (GA AUDIO lines) 1:

Shorted wire check (GA AUDIO lines) 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connectors.
Audio unit connector D (12P)
XM receiver connector A (14P)

?3.
Check for continuity between these test points and body ground individually.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector D (12P): disconnected
 
XM receiver connector A (14P): disconnected

Connector
Terminal
Audio unit connector D (12P)
No. 3
No. 4
No. 9
No. 10

Is there continuity?

     
YES
     
     
     
There is a short to body ground in the wire(s) between the audio unit and the XM receiver. Replace the affected shielded harness.?
     
NO
     
     
     
The GA AUDIO wires are not shorted to ground. Go to step 3.
3.
Shorted wire check (GA AUDIO lines) 2:

Shorted wire check (GA AUDIO lines) 2
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector D (12P): disconnected
 
XM receiver connector A (14P): disconnected

Test point 1
Audio unit connector D (12P)
Test points 2
Audio unit connector D (12P)
No. 3
No. 4, No. 5, No. 9, No. 10
No. 4
No. 5, No. 9, No. 10
No. 5
No. 9, No. 10
No. 9
No. 10

Is there continuity between any of the terminals?

     
YES
     
     
     
There is a short in the wires between the audio unit and the XM receiver. Replace the affected shielded harness.?
     
NO
     
     
     
The GA AUDIO wires are not shorted in the wires. Go to step 4.
4.
Open wire check (GA AUDIO lines):

Open wire check (GA AUDIO lines)
?1.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Audio unit connector D (12P): disconnected
 
XM receiver connector A (14P): disconnected

Test point 1:
Audio unit connector D (12P)
Test point 2:
XM receiver connector A (14P)
No. 9
No. 1
No. 10
No. 2
No. 3
No. 7
No. 4
No. 8

Is there continuity?

     
YES
     
     
     
The GA AUDIO wires are OK. Go to step 5.
     
NO
     
     
     
There is an open in the wire(s) between the audio unit and the XM receiver. Replace the affected shielded harness.?
5.
XM receiver check (substitution):

XM receiver check (substitution)
?1.
Substitute a known-good XM receiver.

?2.
Reconnect all the connectors, and recheck.

Does the symptom go away?

     
YES
     
     
     
     
NO