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 in memory and flash LFC 10-15 on the air bag indicator.

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