Poor Or No Sound With XM Radio (Audio Unit Does Display XM Channels)

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 battery condition first Testing and Inspection.
- Check the XM radio reception in an open area. Poor reception/interference can be caused by nearby tall buildings, mountains, or high-voltage power lines.
- Check the connectors for poor connections or loose terminals.
- If you can only tune to channel 000, 001, 174, and 247, make sure the audio unit is set to channel mode (see owners 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 to 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 code list Audio System Error Codes.�

NO -

Go to step 4.

4. Turn the ignition switch to LOCK (0).

5. Disconnect audio unit connector C (14P).

6. Disconnect XM receiver connector A (14P).

7. With navigation, disconnect USB adapter control unit connector A (14P). Without navigation, go to step 8.

8. Check for continuity between body ground and XM receiver connector A (14P) according to the table.









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 -

Go to step 9.

9. Check for continuity between terminals of audio unit connector C (14P) according to the table.









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 -

Go to step 10.

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













Is there continuity?

YES -

Substitute a known-good XM receiver XM Receiver Removal/Installation, then reconnect all of the connectors, and recheck. If the symptom/indication goes away, replace the original XM receiver XM Receiver Removal/Installation. If the symptom/indication is still present, replace the audio unit Audio Unit Removal/Installation.�

NO -

There is an open in the wire(s) between the audio unit and the XM receiver. Replace the affected shielded harness.�