Diesel Data: Automotive Repair

Tests AA

PINPOINT TEST AA: LFC 36/DTC B1995 - DRIVER SIDE AIR BAG CIRCUIT RESISTANCE LOW


Test AA1:






Test AA2:






Test AA3-AA4:






Test AA4-AA5:






Normal Operation

WARNING: Do not disconnect the wire connector at side air bag module. This is a permanent connection. Doing so may result in air bag accidental deployment, which may result in personal injury.

The restraints control module (RCM) monitors the resistance of the driver side air bag circuit loop and the air bag module igniter at RCM C310b pin 2 and 3. If the resistance is less than 3.6 ohms, the RCM will store diagnostic trouble code (DTC) B1995 and flash lamp fault code (LFC) 36.

Possible Causes
A low resistance on the driver side air bag circuit can be caused by:
- damaged wiring on circuit 30S-JA37 (RD/GN).
- damaged wiring on circuit 31S-JA37 (BK/GN).
- damaged driver side air bag module.
- a faulted RCM.
- damaged electrical connector shorting bar.
- damaged electrical connector camming beam.