Test B: LFC13/DTC B1891 - Air Bag Tone Warning Indicator CKT Short to Battery

B1:

B2:

B3 - B4:

B5 - B6:

Normal Operation
The Restraints Control Module (RCM) monitors its connection to the Generic Electronic Module (GEM) at C310a pin 11. 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 GEM, it will store Diagnostic Trouble Code (DTC) B1891 in memory. The RCM will also flash Lamp Fault Code (LFC) 13 (or a higher priority code if one exists) on the air bag indicator.

Possible Causes
An air bag tone warning indicator circuit short to battery or ignition can be caused by:
^ a short to battery or ignition on circuit 1083 (LB/BK).
^ a damaged or inoperative GEM. a damaged RCM.