Diagnostic Procedure

LOSS OF COMMUNICATION ON PRIVATE BUS - SDARS - DIAGNOSTIC PROCEDURE

TEST	ACTION	APPLICABILITY
1	Turn the ignition off. Disconnect the Satellite Receiver Module harness connector. Disconnect the Satellite Radio Multiplexer harness connector. Measure the resistance between ground and the Audio Bus I circuit between the Receiver and Multiplexer. Is the resistance below 100 ohms? Yes: Repair the short to ground in the Audio Bus I circuit, between the Receiver and the Multiplexer. Perform BODY VERIFICATION TEST VER-1 . No: Go To 2	All
2	Turn the ignition off. Disconnect the Satellite Radio Receiver harness connector. Disconnect the Satellite Radio Multiplexer harness connector. Measure the resistance between ground and the Audio Bus I circuit between the Receiver and Multiplexer. Is the resistance above 5 ohms? Yes: Repair the open in the Audio Bus I circuit, between the Receiver and the Multiplexer. Perform BODY VERIFICATION TEST VER-1 . No: Go To 3	All
3	Turn the ignition off. Disconnect the Satellite Receiver Module harness connector. Disconnect the Satellite Radio Multiplexer harness connector. Turn the ignition on. Using a DVOM, probe the Audio Bus I circuit. Is the voltage above 2 volts? Yes: Repair short to voltage in the Audio Bus I circuit, between the Receiver and the Multiplexer. Perform BODY VERIFICATION TEST VER-1 . No: Go To 4	All
4	Turn the ignition off. Disconnect the Satellite Receiver Module harness connector. Disconnect the Satellite Radio Multiplexer harness connector. Measure the resistance between ground and the Audio Bus I circuit between the Radio and Multiplexer. Is the resistance below 100 ohms? Yes: Repair the short to ground in the Audio Bus I circuit, between the Radio and the Multiplexer. Perform BODY VERIFICATION TEST VER-1 . No: Go To 5	All
5	Turn the ignition off. Disconnect the Satellite Radio Receiver harness connector. Disconnect the Satellite Radio Multiplexer harness connector. Measure the resistance of the Audio Bus I circuit between the Radio and the Multiplexer. Is the resistance above 5 ohms? Yes: Repair the open in the Audio Bus I circuit, between the Radio and the Multiplexer. Perform BODY VERIFICATION TEST VER-1 . No: Go To 6	All
6	Turn the ignition off. Disconnect the Satellite Receiver Module harness connector. Disconnect the Satellite Radio Multiplexer harness connector. Turn the ignition on. Using a DVOM, probe the Audio Bus I circuit. Is the voltage above 2 volts? Yes: Repair short to voltage in the Audio Bus I circuit, between the Receiver and the Multiplexer. Perform BODY VERIFICATION TEST VER-1 . No: Go To 7	All
7	Turn the ignition off. NOTE: Before Continuing: Disconnect the Satellite Receiver harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. NOTE: Before Continuing: Disconnect the Satellite Radio Multiplexer harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. NOTE: Before Continuing: Disconnect the Radio harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors, repair as necessary. Pay particular attention to all Power and Ground circuits. Replace the Satellite Radio Multiplexer in accordance with the service information. Reconnect harness connectors and start the engine. Does the DTC set? Yes: Go To 8 No: Test Complete.	All
8	Replace the Satellite Receiver Module in accordance with the service information. Start the vehicle and operate the Satellite Radio. Does the DTC return? Yes: Go To 9 No: Test Complete.	All
9	If there are no other possible causes remaining, view repair. Repair: Replace the Radio in accordance with service procedures. Perform BODY VERIFICATION TEST VER-1 .	All