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 and overview of each diagnostic category.

### DTC Descriptors

DTC 1052: PPS Preload Failure Region 1
DTC 1053: PPS Preload Failure Region 2
DTC 1054: PPS Preload Failure Region 3
DTC 1055: PPS Preload Failure Region 4

### Circuit/System Description

The passenger presence system (PPS) is divided up into 4 regions. When there is an unwanted force being applied to one or more PPS regions, the PPS will set a diagnostic trouble code (DTC). If the PPS detects any preload DTC within the PPS, it will communicate to the sensing and diagnostic module (SDM) through a dedicated serial data circuit that a PPS fault is present. The SDM will set DTC B0081 indicating a problem within the PPS and will suppress the deployment of the instrument panel (I/P) module and illuminate the AIR BAG indicator.

### Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

### Conditions for Setting the DTC

The PPS will set a DTC when a region has detected a preload/pressure on it, refer to chart below for specific region.

DTC | Preload Regions
--- | ---
DTC 1052 | Region 1
DTC 1053 | Region 2
DTC 1054 | Region 3
DTC 1055 | Region 4

### Action Taken When the DTC Sets

• | The PPS will set a DTC for the appropriate region and communicate the fault to the SDM.

• | The SDM will set DTC B0081 and request the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

• | The PPS will illuminate the passenger air bag status OFF indicator.

### Conditions for Clearing the DTC

• | The condition for setting the DTC no longer exists.

• | A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

### Diagnostic Aids

• | When passenger seat bottom trim cover is serviced or removed, the trim cover, when reinstalled may apply certain unwanted pressure to the PPS causing DTCs 1052-1055 to set.

• | It may be necessary to perform the PPS preload test procedure more then once before replacing any parts.

### 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.

• | PPS module

• | PPS module wiring harness

1. Verify DTC 1051 is not set.

⇒ | If DTC 1051 is set, refer to DTC 1051.

2. Verify that DTC 1052, 1053, 1054, or 1055 is not set.

⇒ | If any of the DTCs are set, perform Passenger Presence System Programming and Setup. If the DTC resets, replace the PPS.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PPS module replacement, setup, and programming