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For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 LaCrosse 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Passenger Presence System Indicator Circuit Malfunction

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

Ignition 1 Voltage

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 (PPS) has enabled or disabled the instrument panel (I/P) inflator module. When the ignition is turned ON, the PPS module is supplied with voltage and illuminates both PASSENGER AIR BAG ON/OFF indicators for 5 seconds; then 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 diagnostic trouble code (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.

Diagnostic Aids

A history DTC maybe caused by an intermittent short or open in the ignition 1 circuit for the passenger AIR BAG ON/OFF indicator.

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 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 ohm between the ground circuit terminal 2 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 4 and ground.
    4. ⇒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 circuit fuse is open, test or replace the inflatable restraint passenger air bag ON/OFF indicator.
  4. Connect a test lamp between the ignition circuit terminal 4 and the control circuit terminal 3.
  5. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds.
    6. ⇒If the test lamp is always on, test the control circuit for a short to ground. If the circuit tests normal replace the PPS module.
    ⇒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 PPS module.
  6. Connect a test lamp between the ignition circuit terminal 4 and the control circuit terminal 1.
  7. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds.
    8. ⇒If the test lamp is always on, test the control circuit for a short to ground. If the circuit tests normal replace the PPS module.
    ⇒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 PPS module.
  8. 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 PPS replacement, setup, and programming