B1427

B1427-REMOTE RADIO SWITCH INPUT CIRCUIT HIGH

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

- When Monitored:
With the Radio on.

- Set Condition:
The CCN Detects the Radio Control MUX circuit is open or shorted to voltage.





1. CHECK FOR ACTIVE DTC
1. With the scan tool, read the active DTC's.
2. Turn the ignition on.
3. With the scan tool, read the active DTC's.

Does the scan tool display B1427: REMOTE RADIO SWITCH INPUT CIRCUIT HIGH?

Yes

- Go To 2

No

- The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Perform the BODY VERIFICATION TEST. Body Verification Test

2. LEFT REMOTE RADIO SWITCH
1. Turn the ignition off.
2. Disconnect the Left Remote Radio Switch harness connector.
3. Turn the ignition on.
4. With the scan tool monitor the Remote Radio Control Switch voltage.

Is the voltage approximately 5.0 volts?

Yes

- Replace the Left Remote Radio Switch.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Go To 3

3. RIGHT REMOTE RADIO SWITCH
1. Turn the ignition off.
2. Disconnect the Right Remote Radio Switch harness connector.
3. Turn the ignition on.
4. With the scan tool monitor the Remote Radio Control Switch voltage.

Is the voltage approximately 5.0 volts?

Yes

- Replace the Right Remote Radio Switch.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Go To 4

4. STEERING CONTROL MODULE
1. Turn the ignition off.
2. Disconnect the SCM C2 harness connector.
3. Turn the ignition on.
4. With the scan tool monitor the Remote Radio Control Switch voltage.

Is the voltage approximately 5.0 volts?

Yes

- Check the (X20) Radio Control MUX circuit for a open between the SCM and the remote radio switches. If ok, replace the steering control module.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Go To 5

5. (X20) RADIO CONTROL MUX CIRCUIT SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Instrument Cluster C3 harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (X20) Radio Control MUX circuit.

Is the voltage above 10.0 volts?

Yes

- Repair the (X20) Radio Control MUX circuit for a short to voltage.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Go To 6

6. (X20) RADIO CONTROL MUX CIRCUIT OPEN
1. Disconnect the Instrument Cluster C3 harness connector.
2. Measure the resistance of the (X20) Radio Control MUX circuit.

Is the resistance above 100.0 ohms?

Yes

- Repair the (X20) Radio Control MUX circuit for a open.
- Perform BODY VERIFICATION TEST. Body Verification Test

No

- Replace the Instrument Cluster.
- Perform BODY VERIFICATION TEST. Body Verification Test