Poor or No Sound With XM Radio (Audio Unit Can Display XM Channels)

Poor or no sound with XM radio (Audio unit does display XM channels)

NOTE:
- Check the vehicle battery condition first.
- Check XM radio reception in an open area with good exposure to the southern horizon. Poor reception/interference can be caused by tall buildings, mountains, or high-voltage power lines.
- If you can only tune to channel 000, 001, 174, and 247, make sure the audio unit is set to channel mode (see owner's manual). If it is set to channel mode, call XM Satellite Radio customer support and check the account activation status.

1. Turn the ignition switch ON (II).
2. Turn on the audio unit and select XM radio.
3. Check for an error message on the display.

Are there any messages displayed?

YES - Go to error codes.

NO - Go to step 4.

4. Turn the ignition switch to LOCK (0).
5. Remove the audio-HVAC display module, and disconnect audio unit connector B (14P).

NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD player's load mechanism.

6. Disconnect XM receiver connector A (14P).
7. Check for continuity between audio unit connector B (14P) and body ground according to the table, then check for continuity between the same terminals listed in the table and audio unit connector B (14P) terminal No. 4 (the harness shield).






Is there continuity?

YES - Short in the wire(s) between audio unit and XM receiver. Replace the affected shielded harness.

NO - Go to step 8.


8. Check for continuity between the XM receiver connector A (14P) and the audio unit connector B (14P) according to the table.






Is there continuity?

YES - Substitute a known-good XM receiver, then reconnect all connectors and recheck. If the symptom/indication goes away, replace the original XM receiver. If the symptom/indication is still present, replace the audio unit.

NO - Open in the wire(s) between audio unit and XM receiver. Replace the affected shielded harness.