For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### Circuit Description

The PASSENGER AIR BAG ON/OFF indicators located on the instrument panel are used to notify the driver when the passenger presence system (PPS) has enabled or disabled the instrument panel (I/P) inflator module. The PPS air bag indicators will also inform the driver of any PPS malfunctions. When the ignition is turned on, the PPS module is supplied with ignition 1 voltage and commands both PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. The PPS module conducts tests on the PPS components and circuits while both PASSENGER AIR BAG ON/OFF indicators are ON. If no malfunctions are detected the PPS module will turn the PASSENGER AIR BAG indicator ON or OFF depending on the status of the PPS. If a malfunction is detected, the PPS module will store a DTC, default the PPS to the OFF state and communicate with the SDM that a DTC has been set. The SDM will request the instrument panel cluster (IPC) to turn the AIR BAG indicator ON to notify the driver of a PPS malfunction.

### Diagnostic Aids

Use this procedure to diagnosis one or both PPS indicators inoperative.

The following can cause an intermittent condition:

• | A short in the passenger air bag OFF indicator control circuit

• | A short in the passenger air bag ON indicator control circuit

• | An open or high resistance in the passenger air bag OFF indicator control circuit

• | An open or high resistance in the passenger air bag ON indicator control circuit

### Reference Information

#### SIR Schematics

SIR Schematics

#### Connector End View Reference

• | SIR Connector End Views

• | Antilock Brake System Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

1. With the ignition OFF, Disconnect the inside accessory switch connector. Inspect the connector for damage or corrosion that may cause a malfunction

⇒ | If a condition exists, make the appropriate repair.

2. Ignition ON, test the ignition 1 voltage circuit for 9-16 volts. If ignition 1 voltage is not present, test for an open/high resistance or a short to ground.

⇒ | If a condition exists, make the appropriate repair.

3. With the ignition OFF, Connect a test lamp between the ignition 1 voltage circuit and the passenger air bag OFF indicator control circuit at the accessory switch connector terminals. Ignition ON, test lamp should illuminate.

⇒ | If the test lamp illuminates, replace the accessory switch.

4. Test the passenger air bag OFF indicator control circuits for a short to ground, open/high resistance.

⇒ | If a condition exists, make the appropriate repair

5. Replace the PPS.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Accessory Switch Replacement

• | SIR/SRS Wiring Repairs

• | Control Module References for PPS replacement, setup, and programming