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

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

F1-F3:

F3-F5:

Lamp Fault Codes (LFCs)







The lamp fault code (LFC) indicates the specific fault associated with diagnostic trouble code (DTC) B1891.

Normal Operation
The restraints control module (RCM) monitors its connection to the lighting control module (LCM) at C310a pin 23. This connection is used to signal a chime if the air bag indicator is inoperative and another SRS fault exists.

If the RCM detects a short to battery on the connection to the LCM, it will store DTC B1891 memory and flash LFC 10-15 on the air bag indicator.

Possible Causes
An air bag tone warning circuit short to battery ignition can be caused by:
- faulted wiring, terminals or connectors.
- a damaged or inoperative LCM.
- a faulted RCM.