B1999

Pinpoint Test 23: LFC 37/DTC B1999 - PASSENGER-SIDE 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 S-2041a and S-2041b, 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 (W/Y).
- damaged wiring on circuit (BR/Y).
- damaged passenger-side air bag module.
- damaged RCM.
- damaged shorting bar or camming beam in S-2041b or S-337.

WARNING: If the supplemental restraint system (SRS) is being serviced, the system must be deactivated and restraint system diagnostic tools must be installed.

The air bag restraint system diagnostic tools must be removed and the air bag modules reconnected when the system is reactivated to avoid non-deployment in a collision, resulting in possible personal injury.

NOTE: Diagnostics or repairs are not to be performed on a seat equipped with a seat side air bag with the seat in the vehicle. Prior to attempting to diagnose or repair a seat concern when equipped with a seat side air bag, the seat must be removed from the vehicle and the restraint system diagnostic tools must be installed in the seat side air bag electrical connectors. The restraint system diagnostic tools must be removed prior to operating the vehicle over the road.

NOTE: After diagnosing or repairing an SRS, the restraint system diagnostic tools must be removed before operating the vehicle over the road.

NOTE: After diagnosing or repairing a seat system, the restraint system diagnostic tools must be removed before operating the vehicle over the road.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.

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