Passenger Presence System Indicator Circuit Malfunction

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 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 in Diagnostic Aids. Component Tests and General Diagnostics

Test Description

Step 1 - Step 8:

Step 9 - Step 10:

The numbers below refer to the step numbers on the diagnostic table.
4. This step tests the ignition 1 voltage circuit between the inside rearview mirror and the underhood fuse block for a short to ground, high resistance, or an open.
5. This step tests the passenger air bag OFF indicator control circuit for a short to ground, a high resistance, or an open.
6. This step tests the passenger air bag ON indicator control circuit for a short to ground, a high resistance, or an open.
7. This step tests the PPS module for proper operation.