U1503

U1503-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM FCM

For a complete wiring diagram Refer to Diagrams/Electrical Diagrams By Number


- When Monitored:

Continuously with the ignition on.

- Set Condition:

When the Anti-Lock Brake Module detects an incorrect CAN message from the Front Control Module (FCM).







Diagnostic Test


1. CHECK IF FCM CAN BUS DTCs ARE PRESENT

With the scan tool, read FCM DTCs.

Are there any FCM CAN BUS DTCs present?

Yes

- Perform ABS VERIFICATION TEST. ABS Verification Test

No

- Replace the Anti-Lock Brakes Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test