Test F: LFC 53/DTC B1891 - Air Bag Tone Warning Indicator Circuit Short to Battery

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

F1-F3:

F3-F5:

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

If the RCM detects a short to battery 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 circuit short to battery or ignition can be caused by:
- damaged wiring, terminals or connectors.
- a damaged or inoperative instrument cluster module.
- a faulted RCM.