Audio System Symptom Troubleshooting - Poor or no sound with XM radio (Audio-navigation unit does display XM channels)

Poor or no sound with XM radio (Audio-navigation 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.
	Check the connectors for poor connections or loose terminals.

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 set the proper XM radio station.

Is the audio output from the speakers when playing the XM radio?


	YES

Intermittent failure, the system is OK at this time.?


	NO

The failure is duplicated, go to step 2.

Shorted wire check (GA AUDIO lines):

Shorted wire check (GA AUDIO lines)

?1.	Turn the vehicle to the OFF (LOCK) mode.

?2.

Disconnect the following connectors.

Audio-navigation unit connector D (12P)

XM receiver connector A (14P)

?3.

Check for continuity between the following test points and body ground individually.

Test condition	Vehicle OFF (LOCK) mode
	Audio-navigation unit connector D (12P): disconnected
	XM receiver connector A (14P): disconnected

Connector	Terminal
Audio-navigation 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-navigation unit and the XM receiver. Replace the affected shielded harness.?


	NO

The GA AUDIO wires are not shorted to ground. Go to step 3.

Shorted wire check (SH GA AUDIO line to another lines):

Shorted wire check (SH GA AUDIO line to another lines)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	Audio-navigation unit connector D (12P): disconnected
	XM receiver connector A (14P): disconnected

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

Is there continuity between any of the terminals?


	YES

There is a short in the wires between the audio-navigation unit and the XM receiver. Replace the affected shielded harness.?


	NO

The SH GA AUDIO wire is OK. Go to step 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-navigation unit connector D (12P): disconnected
	XM receiver connector A (14P): disconnected

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

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-navigation unit and the XM receiver. Replace the affected shielded harness.?

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

Replace the original XM receiver.?


	NO

Replace the audio-navigation unit.?