Body Control System Diagnosis

DTC B1001

CIRCUIT DESCRIPTION
After entering the RUN power mode, the inflatable restraint sensing and diagnostic module (SDM) receives the VIN from BCM, via the class 2 serial data circuit. The SDM also receives a message from the body control module (BCM) containing its restraints ID. The restraints ID contains the last four digits of the SDM part number. The module compares the information stored in its memory with the information received from the BCM. If either the VIN or the restraints ID stored in the BCM do not match those stored in the SDM, the SDM sets DTC B1001.

CONDITIONS FOR RUNNING THE DTC
- Battery voltage is between 9-16 volts.
- The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The restraints ID that is stored in the SDM does not match the restraints ID that is stored in the BCM, or the VIN that is stored in the SDM does not match the VIN that is stored in the BCM.

ACTION TAKEN WHEN THE DTC SETS
The following module specific actions may occur:
- The SDM commands the AIR BAG indicator ON.
- The SDM disables all deployment loops.

CONDITIONS FOR CLEARING THE DTC
- A current DTC clears when the malfunction is no longer present.
- A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

DIAGNOSTIC AIDS
DTC B1001 sets if the restraints ID or the VIN stored in the BCM and SDM do not match. If either the BCM or the SDM were replaced, that module needs to be reprogrammed for proper operation.

TEST

Steps 1-3:

Steps 4-7: