GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2009 🢒 H2 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 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

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 sensing and diagnostic module (SDM) has enabled or disabled the instrument panel (I/P) inflator module. When the ignition is turned ON, the SDM will communicate with the instrument panel cluster (IPC) to illuminate both Passenger Air Bag ON/OFF indicators for 5 seconds. The SDM conducts tests on the inflatable restraint I/P module disable switch circuits while both PASSENGER AIR BAG ON/OFF indicators are illuminated. If no malfunctions are detected, the SDM will turn the PASSENGER AIR BAG indicator ON or OFF, depending on the status of the inflatable restraint I/P module disable switch. If a malfunction is detected, the SDM will store a DTC, default the Passenger Air Bag ON/OFF indicator to the OFF state. The SDM will request the instrument panel cluster (IPC) to illuminate the AIR BAG indicator to notify the driver of a malfunction.

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
    •  SIR/SRS 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.

   • Instrument panel cluster (IPC) module
   • Sensing and diagnostic module (SDM)
   • IPC module wiring harness
   • SDM wiring harness

  1. Ignition OFF, disconnect the harness connector at the inflatable restraint passenger air bag On/Off indicator.
  2. Ignition OFF, test for less then 1 ohm between the ground circuit terminal 2 and ground.
    3. ⇒If greater then 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 control circuit terminal 3 and the ignition circuit terminal 4. With the passenger seat unoccupied, then occupied the test lamp should switch states within 5 seconds.
    5. ⇒If the test lamp is always on, test the control circuit for a short to ground. If all circuits test normal replace the IPC.
    ⇒If the test lamp is always off, test the control circuit for a short to voltage or an open/high resistance. If all circuits test normal replace the IPC.
  5. Connect a test lamp between the control circuit terminal 1 and the ignition circuit terminal 4. 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 all circuits test normal replace the IPC.
    ⇒If the test lamp is always off, test the control circuit for a short to voltage or an open/high resistance. If all circuits test normal replace the IPC.
  6. 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.

    •  SIR/SRS Wiring Repairs
    •  Control Module References for IPC and SDM replacement, setup, and programming