Integrated Trailer Brake Module (ITBM)

U0121-00-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE

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

- When Monitored:
Continuously when the ignition is on.

The battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fuse installed.

Totally Integrated Power Module (TIPM) is configured correctly.

- Set Condition:
Bus messages not received from the Anti-lock Brake System (ABS) Module for approximately two to five seconds.





VERIFY THE DTC IS ACTIVE

NOTE: Make sure the IOD fuse is installed and the battery is fully charged before proceeding.

1. Turn the ignition on.
2. With the scan tool, read active DTCs.

Is the DTC active at this time?

Yes

- Totally Integrated Power Module (TIPM) Perform the U0121-00-Lost Communication with Anti-lock Brake System (ABS) Control Module diagnostic procedure.

No

- Perform the Stored Lost Communication DTCs diagnostic procedure.