B1871

DTC B1871 / LFC 25 - PASSENGER AIR BAG DEACTIVATION (PAD) SWITCH FAULT

Normal Operation
The restraints control module (RCM) monitors the status of the passenger air bag deactivation (PAD) switch at connector S-250 pin 8 (W/LB). The PAD switch signals the RCM by switching a resistance to ground. If the RCM senses 900 - 1100 ohms in the PAD switch, it enables the passenger side air bag and turns off the PAD switch warning lamp. If the RCM senses 400 - 600 ohms in the PAD switch, it deactivates the passenger side air bag and turns the PAD switch warning lamp on. If the RCM detects an invalid resistance, it will store a diagnostic trouble code (DTC) B1871 in memory and flash a lamp fault code (LFC) 25 (or higher priority code if one exists) on the air bag indicator.

Possible Causes
- a damaged or inoperative PAD switch.
- a faulted RCM.
- wiring, terminals, or connectors.

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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