GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Lucerne 🢒 DTC 🢒 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 a primary data key, which is a 4-digit number, and a secondary data key, which is a portion of the vehicle identification number (VIN). 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
    • The 4-digit primary data key stored in the SDM does not match the 4 digits stored in the BCM.
    • The VIN stored in the BCM does not match that of the vehicle.
    • The VIN stored in the SDM does not match that of the BCM.

Action Taken When the DTC Sets
    • The SDM commands ON the AIR BAG warning lamp via serial data communications.
    • The SDM disables all deployments.

Conditions for Clearing the DTC
    • The last 4-digit Primary Data Key in the SDM match the last 4 digits stored in the BCM.
    • The VIN that is stored in the SDM matches the VIN 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 with the new information.

Reference Information

Description and Operation Reference

SIR System Description and Operation

Electrical Information Reference

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

Scan Tool Reference

    •  Scan Tool Data List
    •  Scan Tool Data Definitions

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 DTCs and recheck.
  2. Verify the scan tool parameter Secondary Key Status is Valid.
    3. ⇒If the Secondary Key Status is not valid, verify that Received VIN Digits 2-5 and Received VIN Digits 2-5 parameters match the vehicle VIN. If the parameters do not match the VIN, reprogram the BCM.
    ⇒If the Secondary Key Status is not valid, verify that Received VIN Digits 2-5 and Received VIN Digits 6-7 parameters match the vehicle VIN. If the parameters match the VIN, reprogram the SDM.
  3. Verify the scan tool parameter Primary Key Status is Valid.
    4. ⇒If the Primary Key Status is not valid, verify that the Received Primary Key and the SDM Primary Key parameters match. If the parameters do not match, use the scan tool to perform the Setup SDM Primary Key in BCM.
  4. If all parameters are correct, use the scan tool to clear the DTCs. Verify that DTC B1001 is cleared.
    5. ⇒If DTC B1001 is still 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 and BCM replacement, setup, and programming