B1877

DTC B1885 / 1877 / LFC 46 - DRIVER PRETENSIONER CIRCUIT RESISTANCE HIGH OR LOW

Normal Operation
The restraints control module (RCM) monitors the resistance of the circuit to the driver belt 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 code (DTC) B1885 or B1877.

Possible Causes
An out-of-range resistance on the driver belt pretensioner circuit can be caused by:
- wiring, terminals, or connectors.
- out-of-range resistance on the driver belt pretensioner.
- a faulted RCM.

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.

WARNING: Never probe the connectors on the air bag module. Doing so can result in air bag deployment, which can result in personal injury.

WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner.

Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury.

NOTE: After diagnosing or repairing an SRS, 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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