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 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 are nearby.
- If you can only tune to channel 000, 001, 174, and 247, make sure that the audio unit is set to the channel mode (see owner's manual). If it is set to the channel mode, call XM 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.

NO - Go to step 6.

4. Turn the ignition switch to LOCK (0).
5. Remove the audio-HVAC display module assembly, and disconnect audio unit connector B (14P).
6. Disconnect XM receiver connector A (14P) (without AcuraLink) or AcuraLink control unit (XM receiver) connector A (20P) (with AcuraLink).
7. Check for continuity between body ground and audio unit connector B (14P) terminal No. 5, No. 6, No. 13, and No. 14 individually.






Is there continuity?

YES - Short to body ground in the wire(s) between audio unit and XM receiver (without AcuraLink) or AcuraLink control unit (XM receiver) (with AcuraLink). Replace the affected shielded harness.

NO - Go to step 8.

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






Is there continuity?

YES - Short in the wire(s) between audio unit and XM receiver (without AcuraLink) or AcuraLink control unit (XM receiver) (with AcuraLink). Replace the affected shielded harness.

NO -
- Without AcuraLink: Go to step 9.
- With AcuraLink: Go to step 10.

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






Is there continuity?

YES - Substitute a known-good XM receiver 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 appropriate shielded harness.

10. Check for continuity between audio unit connector B (14P) and AcuraLink control unit (XM receiver) connector A (20P) according to the table.






Is there continuity?

YES - Substitute a known-good AcuraLink control unit (XM receiver) and recheck. If the symptom/indication goes away, replace the original AcuraLink control unit (XM receiver). If the symptom/indication is still present, replace the audio unit.

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