U0186

U0186-LOST COMMUNICATION WITH AUDIO AMPLIFIER





For a complete wiring diagram Refer to Diagrams/Electrical.

- When Monitored:

With the ignition on.

Battery voltage between 10 and 16 volts.

IOD fuse installed.

FCM is configured correctly.

- Set Condition:

Bus messages not received from the Amplifier for approximately 2 to 5 seconds.





Diagnostic Test

1.VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Refer to the Stored Lost Communication test procedure. Stored Lost Communication DTCs
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

2.CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS

With the scan tool, read active DTCs from all modules.

NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

- Diagnose and repair the DTC.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 3

3.VERIFY THAT THE AMPLIFIER IS ACTIVE ON THE BUS

Turn the ignition on.

With the scan tool, select ECU View.

Verify that the Amplifier is active on the bus.

Is the Amplifier active on the bus?

Yes

- Go To 4

No

- Refer to the no response test procedure.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

4.CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS

With the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs "Logged Against" the Amplifier?

Yes

- Replace/update the Amplifier.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace/update the module that set this DTC
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test