Diagnostic Procedure
LOSS OF COMMUNICATION ON PRIVATE BUS - SDARS SYMPTOM CHART
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Turn the ignition off. Disconnect the Satellite Receiver Module harness connectors. Disconnect the Satellite Radio Multiplexer harness connectors. Measure the resistance between ground and the Audio Bus 2 circuit. Is the resistance below 100 ohms? Yes --> Repair the Audio Bus 2 circuit for a short to ground between the Satellite Receiver Module and the Multiplexer. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 2 |
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| 2 | Turn the ignition off. Disconnect the Satellite Receiver Module harness connectors. Disconnect the Satellite Radio Multiplexer harness connectors. Measure the resistance of the Audio Bus 2 circuit between the Satellite Receiver Module and the Multiplexer. Is the resistance below 5.0 ohms? Yes --> Go To 3 No --> Repair the Audio Bus 2 circuit for an open between the Satellite Receiver Module and the Multiplexer. Perform BODY VERIFICATION TEST - VER 1 . |
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| 3 | Turn the ignition off. Disconnect the Satellite Receiver Module harness connectors. Disconnect the Satellite Radio Multiplexer harness connectors. Turn the ignition on. Measure the voltage of the Audio Bus 2 circuit. Is the voltage above 2 volts? Yes --> Repair the Audio Bus 2 circuit for a short to voltage between the Satellite Receiver Module and the Multiplexer. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 4 |
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| 4 | Turn the ignition off. Disconnect the Satellite Radio Multiplexer harness connectors. Disconnect the Radio harness connector. Measure the resistance between ground and the Audio Bus 1 circuit. Is the resistance below 100 ohms? Yes --> Repair the Audio Bus 1 circuit for a short to ground between the Radio and the Multiplexer. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 5 |
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| 5 | Turn the ignition off. Disconnect the Radio harness connector. Disconnect the Satellite Radio Multiplexer harness connectors. Measure the resistance of the Audio Bus 1 circuit between the Radio and the Multiplexer. Is the resistance below 5.0 ohms? Yes --> Go To 6 No --> Repair the Audio Bus 1 circuit for an open between the Radio and the Multiplexer. Perform BODY VERIFICATION TEST - VER 1 . |
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| 6 | Turn the ignition off. Disconnect the Radio harness connector. Disconnect the Satellite Radio Multiplexer harness connectors. Turn the ignition on. Measure the voltage of the Audio Bus 1 circuit. Is the voltage above 2 volts? Yes --> Repair the Audio Bus 1 circuit for a short to voltage between the Radio and the Multiplexer. Perform BODY VERIFICATION TEST - VER 1 . No --> Go To 7 |
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| 7 | Turn the ignition off.
NOTE:
Disconnect the Satellite Receiver Module harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
NOTE:
Disconnect the Satellite Radio Multiplexer harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
NOTE:
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. Attempt to reset the DTC. Does the DTC reset? Yes --> Go To 8 No --> Test Complete. |
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| 8 | Replace the Satellite Receiver Module in accordance with the service information. Start the vehicle and operate the Satellite Radio. Attempt to reset the DTC. Does the DTC reset? Yes --> Go To 9 No --> Test Complete. |
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| 9 | If there are no other possible causes remaining, view repair. Repair Replace the Radio in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1 . |
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