B0074

DTC B0074

Diagnostic Instructions

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



DTC Descriptors
DTC B0074 00
- Passenger Occupant Classification Sensor Circuit

DTC B0074 04
- Passenger occupant Classification Sensor Open Circuit




Circuit/System Description

When the ignition is turned ON, the passenger presence system (PPS) module continually monitors the status of the seat flex mat if the flex mat does not communicate or the PPS module determines the flex mat has an internal malfunction DTC B0074 will set.


Conditions for Running the DTC

Ignition voltage is between 9-16 volts.


Conditions for Setting the DTC


B0074
* The SDM has received a fault message from the PPS module.
* DTC B0074 is a type B DTC.



Action Taken When the DTC Sets

The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG 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.



Reference Information
Schematic Reference

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

Component Connector End Views (Connector Views)
Description and Operation

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

* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Testing

Verify DTC B0074 is not set.

If the DTC is set, replace the flex mat.



Repair Instructions

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

* Inflatable Restraint Passenger Presence System Replacement - Front (Service and Repair)
* Control Module References (Programming and Relearning) for PPS and SDM replacement, setup, and programming.