B1001

CIRCUIT DESCRIPTION
When you first turn the ignition switch to the RUN position, the inflatable restraint sensing and diagnostic module (SDM) compares the restraints ID stored in the SDM to the restraints ID stored in the body control module (BCM). The restraints ID being compared contains the last four digits of the SDM part number. The SDM then compares the vehicle identification number (VIN) stored in the SDM to the VIN stored in the BCM. For more detailed information concerning the Class 2 data lines, refer to Data Link Communications Description and Operation in Data Link Communications.

CONDITIONS FOR SETTING THE DTC
^ Ignition 1 voltage is within the normal operating voltage range.
^ The restraints ID stored in the SDM does not match the restraints ID stored in the BCM, or the VIN information stored in the SDM does not match the VIN information 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 AIR BAG deployments.

CONDITIONS FOR CLEARING THE DTC
^ The restraints ID stored in the SDM matches the restraints ID stored in the BCM and the VIN information stored in the SDM matches the VIN information stored in the BCM.
^ You issue a scan tool CLEAR CODES command.
^ A history DTC will clear once 255 malfunction free ignition cycles have occurred.

When the SDM detects that no DTCs are present, the SDM commands the AIR BAG warning lamp OFF.

DIAGNOSTIC AIDS
DTC B1001 is an indication that the restraint 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

Steps 1-4:

Steps 5-9:

The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks to see if 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.