Restraint System Diagnosis

DTC B1001

CIRCUIT DESCRIPTION
The inflatable restraint sensing and diagnostic module (SDM) stores the vehicles restraint ID from the vehicle identification number (VIN) and the last 4 digits of the SDM part number. When the ignition is turned ON, the SDM compares this information to the information stored in the body control module (BCM) over the GMLAN communication circuit. If there is a mismatch between the information stored in the SDM and BCM, DTC B1001 will set.

DTC DESCRIPTOR




This diagnostic procedure supports the following DTC:
DTC B1001 SDM Option Configuration Error

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description

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

CONDITIONS FOR SETTING THE DTC
B1001 00
- The last 4 digits of the SDM part number does not match the last 4 digits stored in the BCM.
- The VIN stored in the BCM does not match that of the vehicle.

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

CONDITIONS FOR CLEARING THE MIL/DTC
- The last 4 digits of the SDM part number match the last 4 digits stored in the BCM.
- The restraints ID that is stored in the SDM matches the restraints ID that is stored in the BCM.

DIAGNOSTIC AIDS
This DTC is an indication that an incorrect SDM is installed in the vehicle, or that the SDM and/or the BCM was replaced without reprogramming the BCM with the new information.

TEST DESCRIPTION

Steps 1-10:

The numbers below refer to the step numbers on the diagnostic table.
2. This test checks for current SDM DTCs.
3. This test checks to see if the correct VIN is programmed in the BCM.
4. This step explains that the BCM must have the correct VIN.
6. This test checks to see if after clearing the DTCs, this DTC is current.