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.

### Diagnostic Fault Information

Circuit | Short to Ground | High Resistance | Open | Short to Voltage
--- | --- | --- | --- | ---
Passenger Air Bag OFF Indicator Control | 4 | 2* | 2 | --
Passenger Air Bag ON Indicator Control | 5 | 3* | 3 | --
Ground Circuit | -- | 1* | 1 | --
1. No indicators will illuminate. 2. The OFF indicator will not illuminate. 3. The ON indicator will not illuminate. 4. The OFF indictor will illuminate any time the ignition is ON. 5. The ON indictor will illuminate any time the ignition is ON.

* High resistance may cause any or all indicators to illuminate less bright than normal.

### Circuit/System Description

The passenger air bag ON/OFF indicators are used to notify the driver when the Passenger Presence System (PPS) has enabled or disabled the I/P inflator module. When the ignition is turned ON, the ignition voltage is supplied to the passenger air bag ON/OFF indicators and to the PPS module. The instrument panel cluster (IPC) grounds all indicator control circuits to the passenger air bag ON/OFF indicators for illumination. The IPC receives serial data messages from the supplemental inflatable restraints system to illuminate the indicators as necessary.

### Reference Information

#### Schematic Reference

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

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Important: The passenger air bag ON and OFF indicators may not operate as expected if there are supplemental inflatable restraint (SIR) DTCs. Repair all SIR DTC before proceeding with this diagnostic.

1. Ignition ON, the passenger air bag ON and OFF indicators should both illuminate for approximately 5 seconds for a bulb check.
2. Monitor the parameter Passenger Classification in Passenger Presence System with a scan tool. With the passenger seat unoccupied, the parameter should display Empty Seat. The passenger air bag OFF indicator should illuminate.
3. Apply enough weight on the passenger seat to change the parameter display to Small. The passenger air bag OFF indicator should remain illuminated.
4. Apply additional weight to change the parameter display to Large. The passenger air bag indicator should switch from OFF to ON within 5 seconds.

### Circuit/System Testing

Important: When removing connectors inspect for 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 inflatable restraint passenger air bag ON/OFF indicator.
2. Test for less than 1.0 ohm between the ground circuit terminal 8 and ground.

⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the PPS module.

3. Connect a test lamp between the signal circuit terminal 4 and ground.
4. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds.

⇒ | If the test lamp is always off, test the signal circuit for a short to ground. If the circuit tests normal replace the PPS module.

⇒ | If the test lamp is always on, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the PPS module.

5. Connect a test lamp between the signal circuit terminal 3 and ground.
6. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds.

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

⇒ | If the test lamp is always on, test the control signal for a short to voltage or an open/high resistance. If the circuit tests normal replace the PPS module.

7. If all circuits test normal, replace the inflatable restraint passenger air bag ON/OFF indicator.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Inflatable Restraint Instrument Panel Module Indicator Replacement

• | SIR/SRS Wiring Repairs

• | Control Module References for PASSENGER AIRBAG ON/OFF indicator module replacement, setup, and programming