For 1990-2009 cars

• | 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.

• | Do not repair any of the following components. Service the following components by replacement only:

- | The inflatable restraint sensing and diagnostic module (SDM)

- | The inflatable restraint IP (inflator) module

- | The inflatable restraint steering wheel (inflator) module

- | The inflatable restraint steering wheel module coil

- | The inflatable restraint front end discriminating sensor

• | Use only original GM replacement parts available from your authorized GM dealer. Do not use salvaged parts for repairs to the SIR system.

• | Do not install any of the following components if the components have been dropped from a height of 91 centimeters (3 feet) or greater. Discard the component:

- | The inflatable restraint sensing and diagnostic module (SDM)

- | The inflatable restraint IP (inflator) module

- | The inflatable restraint steering wheel (inflator) module

- | The inflatable restraint steering wheel module coil

- | The inflatable restraint front end discriminating sensor

• | 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, only apply power to the SIR system when 1 of the following 2 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 SIR Diagnostic System Check. Perform the SIR 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 SIR Diagnostic System Check may result the following conditions:

- | Extended diagnostic time

- | Incorrect diagnosis

- | Unneeded parts replacement