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
--- | --- | --- | --- | ---
Voltage Reference | 1 | 1* | 1 | --
Passenger Air Bag OFF Indicator Control | 4 | 2* | 2 | --
Passenger Air Bag ON Indicator Control | 5 | 3* | 3 | --

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 has enabled or disabled the I/P inflator module. The sensing and diagnostic module (SDM) controls all of the indicator control circuits to the passenger air bag ON/OFF indicators. When the passenger presence system enables or disables the I/P inflator module it communicates with the SDM through serial data requesting illumination of the indicators.

### 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

Note: 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 Presence Detection Occupancy Status with a scan tool. With the passenger seat unoccupied, the parameter should display Empty. The passenger air bag OFF indicator should illuminate.
3. Apply enough weight to change the parameter display to Occupied. The passenger air bag indicator should switch from OFF to ON within 5 seconds.

### Circuit/System Testing

Note: 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 P14 inflatable restraint passenger I/P module indicator.
2. Connect a test lamp between a ground and the control circuit terminal 2.
3. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds.

⇒ | If the test lamp is always on, test the control circuit for a short to ground. If the circuit tests normal replace the K36 SDM.

⇒ | If the test lamp is always off, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the K36 SDM.

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

⇒ | If the test lamp is always on, test the control circuit for a short to ground. If the circuit tests normal replace the K36 SDM.

⇒ | If the test lamp is always off, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the K36 SDM.

6. If all circuits test normal, replace the P14 inflatable restraint passenger air bag ON/OFF indicator.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Hazard Warning Switch Replacement

• | SIR/SRS Wiring Repairs

• | Control Module References SDM replacement, setup, and programming