Supplemental Inflatable Restraints

DTC B1001

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptor
DTC B1001 00
- SDM Option Configuration Error




Circuit/System 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.


Conditions for Running the DTC

Ignition voltage is between 9-16 volts.


Conditions for Setting the DTC

* 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 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.


Reference Information
Schematic Reference

SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

SIR System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Testing

1. Verify that the scan tool BCM VIN information matches the vehicle VIN.

• If the VINs do not match, reprogram the BCM.

2. Perform the SDM Setup SDM Part Number into BCM procedure.
3. With a scan tool, verify DTC B1001 is not set as current.

• If DTC B1001 is current replace the SDM.




Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Control Module References (Programming and Relearning)for SDM replacement, setup, and programming