GM Service Manual Online
For 1990-2009 cars only
    • Do not expose the inflator modules to temperatures above 65°C (150°F).
    • Verify the correct replacement part number. Do not substitute a component from a different vehicle.
    • Service these components by replacement only.
    • Do not repair any of the following components:
       - The Supplemental Restraint Sensing and Diagnostic Module (SDM)
       - The Supplemental Restraint IP (Inflator) Module
       - The Supplemental Restraint IP Module Switch
       - The Supplemental Restraint Steering Wheel (Inflator) Module
       - The Supplemental Restraint Steering Wheel Module Coil
       - The Supplemental Restraint Front End Discriminating Sensor
    • Use only original replacement parts available from your authorized dealer. Do not use salvaged parts for repairs to the SIR system.
    • Discard any of the following components if the component has been dropped from a height of 91 cm (3  ft) or greater:
       - The Supplemental Restraint Sensing and Diagnostic Module (SDM)
       - The Supplemental Restraint IP (Inflator) Module
       - The Supplemental Restraint IP Module Switch
       - The Supplemental Restraint Steering Wheel (Inflator) Module
       - The Supplemental Restraint Steering Wheel Module Coil
       - The Supplemental Restraint Front End Discriminating Sensor
    • When you replace the SDM, verify that the following conditions are true:
       - The mounting surface is clean.
       - The arrow on the module points toward the front of the vehicle.
       - The module is flat on the mounting surface, parallel to the vehicle datum line.
       - The module fasteners are installed and tightened as specified.
    • In order to avoid setting false diagnostic trouble codes, only apply power to the SRS when one of the following two conditions are met:
       - All SRS components are properly mounted and electrically connected.
       - A diagnostic procedure directs you to apply power.
    • Begin diagnosis of malfunctions with the SRS Diagnostic System Check. Perform the SRS Diagnostic System Check in order to verify the following items:
       - The proper operation of the AIR BAG warning lamp
       - Communication with the SDM through the serial data line
       - The presence or absence of diagnostic trouble codes
       - Whether additional diagnosis is required and where the information resides

Not beginning with the SRS Diagnostic System Check could cause extended diagnostic time, incorrect diagnosis, and unneeded parts replacement.