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 illuminates both PASSENGER AIR BAG ON/OFF indicators for 5 seconds. The PPS module conducts tests on the PPS components and circuits while both PASSENGER AIR BAG ON/OFF indicators are illuminated. 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 illuminate the AIR BAG indicator to notify the driver of a PPS malfunction.

### Reference Information

#### SIR Schematics

SIR Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

SIR System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

Important: When removing connectors inspect fro damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected.

• | Inflatable restraint passenger air bag ON/OFF indicator.

• | Inflatable restraint passenger air bag ON/OFF indicator wiring harness.

1. Ignition OFF, disconnect the harness connector at the accessory switch.
2. Test for less than 1.0 ohm between the ground circuit terminal H and ground

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.

⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance, if the circuit tests normal and the ignition fuse is open, test or replace the accessory switch.

4. With the right front passenger seat occupied, verify that a test lamp illuminates between the control circuit terminal E and B+.

⇒ | If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PPS module.

5. With the right front passenger seat vacant, verify that a test lamp does not illuminate between the control circuit terminal E and B+.

⇒ | If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the PPS module.

6. With the right front passenger seat vacant, verify that a test lamp illuminates between the control circuit terminal D and B+.

⇒ | If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PPS module.

7. With the right front passenger seat occupied, verify that a test lamp does not illuminate between the control circuit terminal D and B+.

⇒ | If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the PPS module.

8. If all circuits test normal, test or replace the accessory switch.

### Component Testing

1. Ignition OFF, disconnect the harness connector at the accessory switch.
2. Install a 2A fused jumper wire between the ignition terminal A and 12 volts. Momentarily install a jumper wire between the control terminal E and ground. Verify the ON indicator illuminates.

⇒ | If the ON indicator does not illuminate, replace the accessory switch.

3. Install a 2A fused jumper wire between the ignition terminal A and 12 volts. Momentarily install a jumper wire between the control terminal D and ground. Verify the OFF indicator illuminates.

⇒ | If the OFF indicator does not illuminate, replace the accessory switch.

### 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