Restraint System Diagnosis

Diagnostics Chart (Part 1 Of 2):

Diagnostics Chart (Part 2 Of 2):

CIRCUIT DESCRIPTION
When the ignition is turned ON, the following things happen in no specific order. 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 four digits of the SDM part number. The SDM compares the VIN that is stored in the SDM to the VIN that is stored in the Powertrain Control Module (PCM) and the BCM.

CONDITIONS FOR RUNNING THE DTC
Ignition voltage is within the normal operating voltage range. (This test is only run once during power up initialization.)

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 PCM and the BCM.

ACTION TAKEN WHEN THE DTC SETS
^ The SDM commands ON the AIR BAG warning lamp.
^ 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 PCM and the BCM.

DIAGNOSTIC AIDS
DTC B1001 is an indication that the restraints ID stored in both the BCM and SDM do not match or that the VIN stored in the PCM, 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 if the correct VIN is programmed in the PCM.
4. This step checks to see if the correct VIN is programmed in the BCM.
6. This step checks to see that the BCM is programmed with the correct SDM part number.