Test F

PINPOINT TEST F: LFC 53/DTC B1891 - AIR BAG TONE WARNING INDICATOR CIRCUIT SHORTED TO VOLTAGE

Test F1-F3:

Test F3-F5:

Normal Operation
The connection between the instrument cluster module and RCM is used to signal a chime if the primary air bag indicator is inoperative and another SRS fault exists. The restraints control module (RCM) monitors this connection to the instrument cluster module at C310a pin 22.

If the RCM detects a circuit failure on the connection to the cluster, it will store diagnostic trouble code (DTC) B1891 in memory and flash lamp fault code (LFC) 53 (or a higher priority code if one exists) on the air bag indicator.

Possible Causes
An air bag tone warning indicator circuit short to voltage can be caused by:
- wiring, terminals, or connectors.
- a short to voltage on circuit 1083 (LB/BK).
- a faulted instrument cluster module.
- a faulted RCM.