For 1990-2009 cars

Important: The following steps must be completed before using the symptom tables.

• | Perform Diagnostic System Check - SIR before using the Symptom Tables in order to verify that all of the following are true:

- | There are no DTCs set.

- | The inflatable restraint sensing and diagnostic module (SDM) can communicate via the class 2 data link.

• | Review the system operation in order to familiarize yourself with the system functions. Refer to SIR System Operation .

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the SIR system. Refer to Checking Aftermarket Accessories in Wiring Systems.

• | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

### Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

### Symptom List

Refer to AIR BAG Warning Lamp Circuit Malfunction in order to diagnose the symptom.