Test D: LFC 53/DTC B1891-ABS Tone Warn Ind Ckt Short to Batt

D1 - D2:

D2 - D3:

D4 - D5:

Normal Operation
The Restraints Control Module (RCM) monitors its connection to the lighting control module at C310b 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 voltage on the connection to the lighting control module, it will store Diagnostic Trouble Code (DTC) B1891 in memory. The RCM will also 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 damaged or inoperative lighting control module.
^ RCM is faulted.