B1001

CIRCUIT DESCRIPTION
When you first turn ON the ignition, the inflatable restraint Sensing and Diagnostic Module (SDM) compares the restraints ID that is stored in the SDM to the restraints ID that is stored in the Body Control Module (BCM). The restraints ID that is being compared contains the last tour digits of the SDM part number. Next, the SDM compares the VIN that is stored in the SDM to the VIN that is stored in the BCM. For more detailed information concerning the Class 2 data lines, refer to Data Link Communications Circuit Description in Data Link Communications.

CONDITIONS FOR RUNNING THE DTC
Ignition 1 voltage is within the normal operating voltage range.

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 information that is stored in the SDM does not match the VIN information that is stored in the BCM. This test is only run once during power up initialization.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM commands ON the AIR BAG warning lamp via Class 2 serial data.
^ The SDM disables all deployments.

CONDITIONS FOR CLEARING THE DTC
The restraints ID that is stored in the SDM matches the restraints ID that is stored in the BCM and the VIN information that is stored in the SDM matches the VIN information that is stored in the BCM.

DIAGNOSTIC AIDS
DTC B1001 is an indication that the restraints ID's stored in both the BCM and SDM do not match or that the VIN's stored in both the BCM and SDM do not match. If either the BCM and/or PCM were replaced, the replacement modules need to be reprogrammed for proper operation.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks to see it the correct VIN is programmed in the Powertrain Control Module (PCM).
4. This step checks to see if the body control module (BCM) has been replaced.
5. This step explains the proper steps to perform after a BCM has been replaced in order for the BCM to operate properly.
6. This step checks to see if the correct VIN is programmed in the BCM.
7. This step explains how to properly program the VIN into the BCM.