AC: LFC 37/DTC B1999 - Passenger Air Bag Circuit Resistance Low

Normal Operation
The Restraints Control Module (RCM) monitors the resistance of the passenger side air bag circuit loop and the air bag module igniter at RCM C1 pins 5 and 6. If the resistance is less than 1.4 ohms, the RCM will store Diagnostic Trouble Code (DTC) B1999 and flash Lamp Fault Code (LFC) 37.

Possible Causes
A low resistance on the passenger side air bag circuit can be caused by:
- damaged wiring on circuit 1259 (WH/YE).
- damaged wiring on circuit 1260 (BN/YE).
- damaged passenger side air bag module.
- damaged RCM.
- damaged shorting bar or camming beam in C233 or C314.

Pinpoint Test Steps:

AC1 - AC2:

AC3 - AC4:

AC5 - AC6:

AC7: