Air Bag Systems: Service and Repair

^ Do not expose 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 inflatable restraint front end discriminating sensor.
- The inflatable restraint IP (inflator) module.
- The inflatable restraint IP module switch.
- The inflatable restraint Sensing and Diagnostic Module (SDM).
- The inflatable restraint steering wheel (inflator) module.
- The inflatable restraint steering wheel module coil.

^ Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the SIR system.
^ Discard any of the following components if the components have been dropped from a height of 91 cm (3 ft) or greater.
- The Inflatable restraint front end discriminating sensor.
- The Inflatable restraint IP (inflator) module.
- The Inflatable restraint IP module switch.
- The inflatable restraint Sensing and Diagnostic Module (SDM).
- The inflatable restraint steering wheel (inflator) module.
- The inflatable restraint steering wheel module coil.

^ When you replace the SDM, verify that the following conditions are met:
- 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 (DTCs), only apply power to the SIR system when one of the following two conditions is met:
- All SIR system components are properly mounted and electrically connected.
- A diagnostic procedure directs you to apply power.

^ Begin diagnosis of malfunctions with the Diagnostic System Check - SIR. Refer to A Diagnostic System Check - SIR. Perform the Diagnostic System Check - SIR in order to verify the following:
- Proper operation of the AIR BAG warning lamp.
- Communication with the SDM through the Class 2 serial data line.
- The presence or absence of Diagnostic Trouble Codes (DTCs).
- Whether additional diagnosis is required and where the information resides.

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