B1877

Pinpoint Test 28: LFC 46/DTC B1877/B1885 - DRIVER PRETENSIONER CIRCUIT RESISTANCE HIGH OR LOW

Normal Operation
The restraints control module (RCM) monitors the resistance of the circuit to the driver safety belt buckle pretensioner. When the RCM detects a resistance that is out of the expected range (high or low) it will set lamp fault code (LFC) 46 and diagnostic test (DTC) B1877 or 1877.

Possible Causes
An out-of-range resistance on the drive safety belt buckle pretensioner circuit can be caused by:
- an out-of-range resistance on circuit (LG/R).
- an out-of-range resistance on circuit (LG/B).
- an out-of-range resistance on the driver pretensioner.
- an RCM internal concern.

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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