GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Epica 🢒 Restraints 🢒 SIR 🢒 Inflatable Restraint Sensing and Diagnostic Module Replacement

Removal Procedure

    Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section.

    Caution: Refer to SIR Caution in the Preface section.


    Object Number: 1256124 Size: SH

    Important: If the vehicle interior has been exposed to extensive water intrusion such as water leaks, driving through high water, flooding, or other causes, then the sensing and diagnostic module (SDM) and SDM connector may need to be replaced. With the ignition OFF, inspect the area of SDM, including the carpet. If any significant soaking or evidence of previous soaking is detected, the water must be removed, the water damage repaired, and the SDM and SDM connector must be replaced. Before attempting any of these repairs, the SIR must be disabled. Refer to SIR Disabling and Enabling .

  1. Disable the supplemental inflatable restraints (SIR). Refer to SIR Disabling and Enabling
  2. Remove the floor console. Refer to Front Floor Console Replacement .
  3. Remove the connector position assurance lock, which is tethered to the SDM connector.
  4. Disconnect the SDM electrical connector.
  5. Remove the SDM mounting bolts.
  6. Remove the SDM.

Installation Procedure

    Caution: Refer to SIR Special Tool Caution in the Preface section.

    CAUTION: Be careful when you handle a sensing and diagnostic module (SDM). Do not strike or jolt the SDM. Before applying power to the SDM:

       • Remove any dirt, grease, etc. from the mounting surface
       • Position the SDM horizontally on the mounting surface
       • Point the arrow on the SDM toward the front of the vehicle
       • Tighten all of the SDM fasteners and SDM bracket fasteners to the specified torque value
    Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SRS system repairs.

  1. Install the SDM with the arrow pointing toward the front of the vehicle.

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


    Object Number: 1256125 Size: SH
  2. Install the SDM mounting bolts.

    3. Tighten
    Tighten the SDM mounting bolts to 10 N·m (89 lb in).

  3. Connect the SDM electrical connector.
  4. Install the connector position assurance lock.
  5. Install the floor console. Refer to Front Floor Console Replacement .
  6. Enable the SIR. Refer to SIR Disabling and Enabling .
  7. Refer to Control Module References for programming and setup information.