GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Cobalt 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC B1001

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions 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 serial data 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

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 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

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing
  1. Ignition ON, use the scan tool to request SIR DTCs. Verify that DTC B1001 is set as current.
    2. ⇒If DTC B1001 is history, clear codes and recheck.
  2. Using the scan tool check the BCM that is programmed with the VIN. Verify that the BCM is programmed with the correct VIN number with the vehicle VIN plate.
    3. ⇒If the BCM has the wrong VIN number refer to BCM in Repairs Instructions for programming.
  3. Using the scan tool perform the Setup SDM Part Number into BCM procedure.
  4. Ignition ON use the scan tool to clear the DTCs. Verify that DTC B1001 is cleared.
    5. ⇒If DTC B1001 was current replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  SIR/SRS Wiring Repairs
    •  Control Module References for SDM or BCM replacement, setup, and programming