GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 TrailBlazer - 2WD 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Inflatable Restraint Sensing and Diagnostic Module Replacement

Removal Procedure

    Caution: Refer to SIR Caution in the Preface section.

    Caution: Do not strike or jolt the inflatable restraint sensing and diagnostic module (SDM). Before applying power to the SDM, make sure that it is securely fastened with the arrow facing toward the front of the vehicle. Failure to observe the correct installation procedure could cause SIR deployment, personal injury, or unnecessary SIR system repairs.


    Object Number: 741873 Size: SH
  1. Disable the supplemental inflatable restraint (SIR) system. Refer to SIR Disabling and Enabling .
  2. Remove the floor console. Refer to Console Replacement.
  3. Partially remove the console mounting bracket in order to allow access to the rear carpet. Refer to Floor Console Bracket Replacement.
  4. Position the rear carpet in order to access the sensing and diagnostic module (SDM).
  5. Disconnect the electrical connectors (2) from the SDM (1).

    6. Object Number: 741874 Size: SH
  6. Remove the nuts that retain the SDM to the floor panel.
  7. Remove the SDM from the vehicle.

Installation Procedure
  1. Remove any dirt, grease, etc. from the mounting surface.

    2. Object Number: 741874 Size: SH
  2. Install the SDM horizontally to the vehicle.
  3. Point the arrow on the SDM towards the front of the vehicle.

    4. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the nuts that retain the SDM to the floor panel.

    5. Tighten
    Tighten the nuts to 12 N·m (106 lb in).


    Object Number: 741873 Size: SH
  5. Connect the electrical connectors (2) to the SDM (1).
  6. Return the carpet to the fully installed position.
  7. Install the console mounting bracket to the floor panel. Refer to Floor Console Bracket Replacement.
  8. Install the floor console. Refer to Console Replacement.

    9. Important: The AIR BAG indicator may remain ON after the SDM has been replaced. DTC B1001 may set requiring the SDM part number to be set in multiple modules. If the indicator remains ON after enabling the SIR system, perform the diagnostic system check and follow the steps thoroughly to ensure that the SDM is set up properly.

  9. Enable the SIR system. Refer to SIR Disabling and Enabling.
  10. Refer to Control Module References for programming and setup information.