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 an overview of each diagnostic category.

### DTC Descriptor

DTC 064: PPS Communication/ID Performance

### Circuit/System Description

The Inflatable Restraint Passenger Presence System (PPS) is used to monitor the weight of an occupant on the front outboard passenger seat and communicate the status to the sensing and diagnostic module (SDM) whether to enable or suppress the deployment of the instrument panel (I/P) module. The PPS consist of an electronic control module, silicone filled sensor pad, pressure sensor, seat belt tension retractor sensor, wiring harness, and PASSENGER AIR BAG ON/OFF indicators. The silicone filled sensor pad is located under the passenger seat foam cushion and is connected by a hose clamped to the pressure sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the pressure sensor. The pressure sensor sends a voltage signal to the PPS module. If the pressure from the occupant's weight is less than a specified value, the PPS module will send a suppress signal to the SDM to disable the I/P module. If the pressure from the occupant's weight is higher than a specified value, the PPS module will send an enable signal to the SDM to enable the I/P module. The PPS module will notify the customer of the enable/disable status by turning on one of the PASSENGER AIR BAG ON/OFF indicators located on the instrument panel. The PPS monitors itself for faults and will set flash DTC if a fault is detected. The PPS will also notify the SDM of a fault. The SDM will respond by setting either DTC B0092 or B0098 and requesting the instrument panel cluster (IPC) to turn the AIR BAG indicator ON.

### Conditions for Running the DTC

Ignition 1 voltage is within the normal operating voltage range.

### Conditions for Setting the DTC

• | The PPS has lost communications with the SDM.

• | The PPS verification ID does not match the ID that is stored in the SDM.

### Action Taken When the DTC Sets

• | The SDM disables the instrument panel (I/P) module deployment loop.

• | The SDM commands the AIR BAG indicator ON via class 2 serial data.

### Conditions for Clearing the DTC

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

• | The scan tool CLEAR DTC command has been issued.

• | A history DTC will clear once 255 malfunction-free ignition cycles have occurred.

### Diagnostic Aids

Important: DTC B0098 is an indication that the SDM has received an incorrect PPS verification ID. The SDM will continue to request the verification ID from the PPS for 5 seconds. If the SDM does not receive the correct verification ID from the PPS within 5 seconds, the SDM will set DTC B0098 as current, illuminate the AIR BAG indicator, and disable the I/P module deployment loop. If either the SDM or PPS were replaced make sure the correct part numbers were used for the vehicle application.

DTC B0092 or B0098 will set if the PPS has a current malfunction and has set DTC 064. The SDM will set DTC B0092 or B0098 as current and command the AIR BAG indictor ON. This is done to notify the driver of any PPS malfunctions. When DTC B0092 or B0098 are present it is important to check the PPS for any current DTCs. Refer to Passenger Presence System Flash Code Procedures .

### Reference Information

#### Schematic Reference

SIR Schematics

#### Connector End View Reference

SIR Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

1. Ignition ON. With the scan tool check for DTC 064 as a current DTC. Refer to Passenger Presence System Flash Code Procedures .

⇒ | If DTC 064 is NOT a current DTC, rezero the PPS system.

2. Ignition ON. If DTC 064 is a current DTC, check for DTC B0098 as a current DTC.

⇒ | If DTC B0098 is a current DTC, refer to DTC B0098 .

3. Ignition OFF. Inspect the PPS module, SDM and main seat harness connectors for corrosion or damage.

⇒ | If any of the above conditions are found, make the appropriate repair.

4. Reconnect all components, and test the PPS class 2 serial data circuit for a short to voltage.

⇒ | If any of the above conditions are found, make the appropriate repair. Reconnect all components and rezero the PPS.

5. Replace the PPS.

⇒ | After replacement and rezeroing of the PPS are completed, verify that DTC 064 does not reset. Perform the repair verification.

6. If DTC 064 resets, replace the SDM.

⇒ | After replacement and setup of the SDM is completed, rezero the PPS. Perform the repair verification.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | SIR/SRS Wiring Repairs

• | Control Module References for PPS and SDM replacement, setup, and programming