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 connectors for poor connections or loose terminals.
- Check the radio reception in an open area. Poor reception/interference can be caused by tall buildings, mountains, or high-voltage power lines that are nearby.
- If you can only tune channel 000, 001, 174, or 247, make sure that the audio unit is set to the channel mode. If it is set to channel mode, call XM satellite radio customer support and check the account activation status.

1. Turn on the audio unit and select XM radio.

2. Check for an error message on the display.

Are there any messages displayed?

YES -

Go to error code list Audio System Error Codes.�

NO -

- With navigation: Go to step 3.
- Without navigation: Go to step 9.

3. Make sure the ignition switch is in LOCK (0).

4. Disconnect audio disc changer connector B (14P).

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

6. Check for continuity between audio disc changer connector B (14P) and body ground according to the table.









Is there continuity?

YES -

There is a short to body ground in the wire(s) between the XM receiver and the audio disc changer. Replace the affected shielded harness.�

NO -

Go to step 7.

7. Check for continuity between terminals of audio disc changer connector B (14P) according to the table.









Is there continuity between any of the terminals?

YES -

There is a short in the wires between the XM receiver and the audio disc changer. Replace the affected shielded harness.�

NO -

Go to step 8.

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













Is there continuity?

YES -

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

NO -

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

9. Make sure the ignition switch is in LOCK (0).

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

11. Disconnect audio unit connector D (14P).

12. Check for continuity between audio unit connector D (14P) and body ground 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 13.

13. Check for continuity between terminals of audio unit connector D (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 14.

14. Check for continuity between audio unit connector D (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. 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.�