Tests AH: DTC U0121 - Lost Communication With Anti-Lock Brake System Control Module (ABS)

PINPOINT TEST AH: DTC U0121 - LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM CONTROL MODULE (ABS)

Normal Operation
The instrument cluster (IC) sets DTC U0121 if data messages received from the ABS module over the high speed controller area network (HS-CAN) are missing. For a complete list of all network messages, refer to Information Bus (Module Communications Network).

This pinpoint test is intended to diagnose the following:
- Module communication
- Instrument cluster (IC)

AH1-AH2:

AH3-AH4: