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

DTC B1001 SDM

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.

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 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. Use the scan tool in the SIR menu, go to Data Display then SIR menu, then go to Key Identification menu. Look at the Secondary Key Status to see if the scan tool show this as being Valid. Verify the scan tool shows this Secondary Key Status is Valid.
    3. ⇒If the Secondary Key Status is not valid then look at the Received VIN Digits 2-7. Compare Received VIN Digits to the vehicle VIN.
    ⇒If the VIN is different from the vehicle, then the BCM has the incorrect VIN programmed. Use the scan tool to program the BCM.
  3. Use the scan tool in the SIR menu, go to Data Display then SIR menu, then go to Key Identification menu. Look at the Primary Key Status to see if the scan tool shows this as being Valid. Verify the scan tool shows the Primary Key Status is Valid.
    4. ⇒If the Primary Key Status is not valid, then look at the Received Primary Key. Compare Received Primary Key to the stored SDM Primary Key. If the SDM Primary Key differs from the Received Primary Key, use the scan tool to Setup SDM Primary Key into BCM procedure.
  4. Ignition ON, 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