GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Spark 🢒 Preface 🢒 Cautions and Notices 🢒 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: 1618027 Size: SH

    Caution: If the vehicle interior is exposed to moisture and becomes soaked up to the level of the sensing and diagnostic module (SDM), the SDM and SDM harness connector must be replaced. The SDM could be activated when powered, which could cause airbag deployment and result in personal injury.

  1. Disable the SIR system. Refer to SIR Disabling and Enabling .
  2. Remove the floor console. Refer to Front Floor Console Replacement .
  3. Remove the connector position assurance (CPA).
  4. Disconnect the sensing and diagnostic module (SDM) electrical connector (1).
  5. Remove the SDM fasteners (2).
  6. Remove the SDM (3).

Installation Procedure

    Object Number: 1618027 Size: SH
  1. Install the SDM (3).

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

    Caution: Be careful when you handle a sensor. Do not strike or jolt a sensor. Before applying power to a sensor:

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

  2. Install the SDM attaching nuts (2).

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

  3. Connect the SDM electrical connector (1).
  4. Install the connector position assurance lock, which is tethered to the SDM connector.
  5. Install the floor console. Refer to Front Floor Console Replacement .
  6. Enable the SIR system. Refer to SIR Disabling and Enabling .