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

Poor or no sound with XM radio (audio unit can display XM channels)

NOTE:
- Check the radio reception in an open area. Compare it to a known-good vehicle whenever possible. Poor reception/interference can be caused by tall buildings, mountains, or high-voltage power lines that are nearby.
- If you can only tune to channel 000.001, 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 radio customer support and check the account activation status.

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.

NO - 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. 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 the 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 the audio unit and the XM receiver.