Diagnostic Test

VERIFY DTC IS ACTIVE

NOTE:

Make sure the battery is fully charged before proceeding.

Turn the ignition on.
With the scan tool, read the active DTCs.
Does the scan tool display: U0121-00-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE?

Yes
- Refer to DTC INDEX (1 OF 2) and/or DTC INDEX (2 OF 2) and perform the U0121-87-Lost Communication with Anti-lock Brake System (ABS) Control Module-Missing Messages diagnostic procedure.
No
- Refer to STORED LOST COMMUNICATION DTCS and perform the Stored Lost Communication DTCs diagnostic procedure.