No Response From RRM (Radio Receiver Module)

NO RESPONSE FROM RRM (RADIO RECEIVER MODULE)

For a complete wiring diagram, refer to the Wiring Information.






1. TEST FOR INTERMITTENT CONDITION

NOTE: Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

1. Turn the ignition on.

NOTE: Make sure the battery voltage is between 10.0 and 16.0 volts.

2. With the scan tool, read the module status.

NOTE: Check the BCM for any active CAN hardware DTCs, perform DTC before proceeding.

Does the scan tool indicate that the module is active on the bus?

Yes

- Go To 2

No

- The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Turn the ignition off.
2. Disconnect the Radio harness connector.
3. Using a 12-volt test light connected to ground, check the Fused B(+) circuit.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the open or short in the Fused B(+) circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE GROUND CIRCUIT FOR AN OPEN
1. Using a 12-volt test light connected to 12-volts, check the Ground circuit.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the open in the Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE CAN B BUS CIRCUIT FOR AN OPEN
1. Measure the resistance of the CAN B Bus (-) circuit between the Radio harness connector and the BCM harness connector.
2. Measure the resistance of the CAN B Bus (+) circuit between the Radio harness connector and the BCM harness connector.

Is resistance below 5.0 Ohms on both circuits?

Yes

- Replace the Radio.Radio - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the open in the CAN B Bus circuit. Inspect the connector for damage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.