GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Rendezvous - FWD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Passenger Presence System Indicator Circuit Malfunction

Circuit Description

The PASSENGER AIR BAG ON/OFF indicators located on the rearview mirror 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 commands both PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. Then the PPS module conducts tests on the PPS components and circuits while both PASSENGER AIR BAG ON/OFF indicators are ON. 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 sensing and diagnostic module (SDM) that a DTC has been set. The SDM will request the instrument panel cluster (IPC) to turn the AIR BAG indicator ON to notify the driver of a PPS malfunction.

Diagnostic Aids

The following are possible causes of the malfunction:

    • A short in the passenger air bag OFF indicator control circuit
    • A short in the passenger air bag ON indicator control circuit
    • An open or high resistance in the passenger air bag OFF indicator control circuit
    • An open or high resistance in the passenger air bag ON indicator control circuit

Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Test the inside rearview mirror ignition 1 voltage circuit for a short to ground, a high resistance, or an open.

    2.

  2. This step tests the passenger air bag OFF indicator control circuit for a short to ground, a high resistance, or an open.

    3.

  3. This step tests the passenger air bag ON indicator control circuit for a short to ground, a high resistance, or an open.

    4.

  4. This step tests the PPS module for proper operation.

Step

Action

Yes

No

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn OFF the ignition.
  2. Disconnect the passenger presence system (PPS) module connector located under the passenger seat. Refer to Control Module References for replacement, setup, and programming.
  3. Inspect the PPS module connector for corrosion or damage. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 3

3
  1. Disconnect the inside rearview mirror connector located at the back of the mirror.
  2. Inspect the inside rearview mirror connector for corrosion or damage. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 4

4

  1. Turn OFF the ignition.
  2. Test the inside rearview mirror ignition 1 voltage circuit for one of the following:
    3. • An open
    • High resistance
    • Short to ground
  3. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step  10

Go to Step 5

5

Test the PASSENGER AIR BAG OFF indicator control circuit between the rearview mirror and the PPS for one of the following:

    • An open
    • High resistance
    • Short to voltage

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Test the PASSENGER AIR BAG ON indicator control circuit between the rearview mirror and the PPS for one of the following:

    • An open
    • High resistance
    • Short to voltage

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 7

7

  1. Turn OFF the ignition.
  2. Connect a test lamp between the ignition 1 voltage circuit and the passenger air bag OFF indicator control circuit at the inside rearview mirror connector terminals.
  3. Empty the front passenger seat.
  4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

8

Replace the rearview mirror. Refer to Inside Rearview Mirror Replacement .

Did you complete the replacement?

Go to Step 10

--

9

Replace the PPS. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 10

--

10
  1. Reconnect all PPS and rearview mirror system components.
  2. Verify that all components, connectors, and connector position assurances (CPAs) are properly mounted.
  3. Use the scan tool in order to clear the SIR and PPS DTCs.
  4. Rezero the PPS. Refer to Passenger Presence System Programming and Setup .
  5. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2