XM Radio Display Is Blank and No Station Information Is Displayed (With Navigation)

XM radio display is blank and no station information is displayed (with navigation)

NOTE:
- Check the vehicle battery condition first.
- Check the connectors for poor connections or loose terminals.

1. Measure the voltage between XM receiver connector A (14P) No. 1 terminal and body ground.






Is there battery voltage?

YES - Go to step 2.

NO - Repair open in the wire between No. 23 (10 A) fuse in the under-hood fuse/relay box and XM receiver connector A (14P) No. 1 terminal.

2. Turn the ignition switch to ON (II).
3. Measure the voltage between XM receiver connector A (14P) No. 11 terminal and body ground.






Is there less than 0.1 V?

YES - Go to step 4.

NO - Repair open in the wire between the XM receiver connector A (14P) No. 1 terminal and navigation unit connector E (14P) No. 11 terminal.

4. Turn the ignition switch to LOCK (0).
5. Measure the voltage between XM receiver connector A (14P) No. 2 terminal and body ground.






Is there 10 V or more present?

YES - Go to step 7.

NO - Go to step 6.

6. Measure the voltage between navigation unit connector E (14P) No. 2 terminal and body ground.






Is there 10 V or more present?

YES - Repair open or short to body ground in the wire between the navigation unit and XM receiver.

NO - Substitute a known-good navigation unit and recheck. If 10 V or more are present, replace the original navigation unit.

7. Turn the ignition switch to ON (II).
8. Measure voltage between the navigation unit connector E (14P) No. 2 terminal and body ground.






Is there less than 0.5 V?

YES - Go to step 9.

NO - Substitute a known-good navigation unit and recheck. If 0.5 V or less are present, replace the original navigation unit.

9. Turn the ignition switch to LOCK (0).
10. Disconnect navigation unit connector E (14P) and XM receiver connector A (14P).
11. Check for continuity between navigation unit connector E (14P) and body ground according to the table. Then check for continuity between the same terminals listed in the table and navigation unit connector E (14P) No. 3 terminal (the harness shield).






Is there continuity?

YES - Short to body ground in the wire(s) between navigation unit and XM receiver. Replace the affected shielded harness.

NO - Go to step 12.

12. Check for continuity between navigation unit connector E (14P) and XM receiver connector A (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 symptom/indication is still present, replace the navigation unit.

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