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 radio reception in an open area. Poor reception/interference can be caused by tall buildings, mountains, or high-voltage power lines are nearby.

1. Turn the ignition switch to ACC (I).
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. Error Codes

NO -
- With navigation: Go to step 7.
- Without navigation: Go to step 4.

4. Disconnect audio unit connector D (14P) and XM receiver connector A (14P).




5. Check for continuity between XM receiver connector A (14P) and body ground according to the table. Then check for continuity between the same terminals listed in the table and audio unit connector D (14P) No. 4 terminal (the harness shield).

Is there continuity?

YES - Repair short in the wire between the audio unit and the XM receiver, or replace the appropriate shielded harness.

NO - Go to step 6.




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

Is there continuity?

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

NO - Repair open in the wire between audio unit and XM receiver.

7. Disconnect audio disc changer connector B (14P) and XM receiver connector A.




8. Check for continuity between XM receiver connector A (14P) and body ground according to the table. Then check for continuity between the same terminals listed in the table and audio disc changer connector B (14P) No. 4 terminal (the harness shield).

Is there continuity?

YES - Repair short in the wire between the audio disc changer and the XM receiver, or replace the appropriate shielded harness.

NO - Go to step 9.




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

Is there continuity?

YES - Go to step 10.

NO - Repair open in the wire between audio disc changer and XM receiver.

10. Disconnect audio disc changer connector A (18P) and audio unit connector D (14P).




11. Check for continuity between audio disc changer connector A (18P) and body ground according to the table. Then check for continuity between the same terminals listed in the table and audio disc changer connector A (18P) No. 11 terminal (the harness shield).

Is there continuity?

YES - Repair short in the wire between the audio disc changer and the audio unit, or replace the appropriate shielded harness.

NO - Go to step 12.




12. Check for continuity between audio disc changer connector A (18P) and audio unit connector D (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 - Repair open in the wire between audio disc changer and the audio unit.