Tests BL: DTC U1900 - CAN Communication Bus Fault - Receive Error

PINPOINT TEST BL: DTC U1900 - CAN COMMUNICATION BUS FAULT - RECEIVE ERROR

BL1-BL3:

BL4:

Normal Operation
The restraints control module (RCM) monitors the HS-CAN for messages from the instrument cluster module and the powertrain control module. If the RCM detects a communication bus fault or missing messages, it will store diagnostic trouble code (DTC) U1900 in memory and illuminate the air bag indicator.

Fault Conditions
The RCM monitors for the following fault conditions:
- Missing message from the instrument cluster module
- Missing message from the powertrain control module (PCM)

Possible Causes
A CAN communication bus fault - receive error can be caused by:
- damaged wiring, terminals or connectors.
- a faulted instrument cluster module.
- a faulted powertrain control module (PCM).
- a faulted RCM.