B1891

DTC B1891 - AIR BAG TONE WARNING INDICATOR CIRCUIT SHORT TO BATTERY OR IGNITION

Normal Operation
The restraints control module (RCM) monitors its connection to the Generic Electronic Module (GEM) at pin 19, connector T-2100b. This connection is used to signal a chime if the air bag indicator is inoperative and another air bag system fault exists. If the RCM detects a short to battery or ignition on the connection to the GEM, it will store a diagnostic trouble code (DTC) B1891 in memory.

Possible Causes
An air bag tone warning indicator circuit short to battery or ignition could be caused by:
- a short to battery or ignition on (LB/B) wire.
- a damaged or inoperative GEM.
- 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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