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DTC 064




DTC 064

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC 064
- PPS Communication/ID Performance

Circuit/System Description

The Passenger Presence System (PPS) is used to monitor the weight of an occupant on the front passenger seat and communicate the status to the inflatable restraint sensing and diagnostic module (SDM) whether to enable or suppress the deployment of the passenger instrument panel air bag. The PPS consist of an electronic control module, silicone filled sensor pad, passenger presence sensor, passenger seat belt tension 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 passenger presence sensor. The weight of the occupant sitting in the front passenger seat is measured as a pressure change within the bladder by the passenger presence sensor. The passenger presence sensor sends a voltage signal to the passenger presence module. If the pressure from the occupant's weight is less than a specified value, the passenger presence module will send a suppress signal to the SDM to disable the passenger instrument panel air bag. If the pressure from the occupant's weight is higher than a specified value, the passenger presence module will send an enable signal to the SDM to enable the passenger instrument panel air bag. The passenger presence module will notify the customer of the enable/disable status by illuminating 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 passenger presence module 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 illuminate the AIRBAG indicator.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

* The passenger presence module has lost communications with the SDM.
* The passenger presence module 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 requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Diagnostic Aids

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


Reference Information
Schematic Reference

SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

SIR System Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) 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 component/connector.


* Passenger presence module

* SDM

* Passenger presence module wiring harness connector

* SDM wiring harness connector


1. Ignition OFF, disconnect the harness connector at the passenger presence module and the SDM.
2. Test for less than 1 ohm between the serial data circuit terminal 18 at the passenger presence module harness connector and terminal 2 at the SDM harness connector.

• If greater than the specified range, test the serial data circuit for an open/high resistance.

3. If all circuits test normal, test or replace the passenger presence module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs (SIR/SRS Wiring Repairs)
* Control Module References (Programming and Relearning) for passenger presence system or SDM replacement, setup, and programming

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