B0074

DTC B0074

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 Descriptors
DTC B0074 00
- Passenger Occupant Classification Sensor

DTC B0074 0D
- Passenger Occupant Classification Sensor Circuit Resistance Above Threshold

DTC B0074 0E
- Passenger Occupant Classification Sensor Circuit Resistance Below Threshold

DTC B0074 0F
- Passenger Occupant Classification Sensor Circuit Erratic (Wet Seat)

Circuit/System Description

The passenger presence system (PPS) sensor continually monitors itself and if a fault in this circuit occurs, a DTC will set. When the sensing and diagnostic module (SDM) detects this DTC within the PPS, it will notify the customer of the enable/disable status by illuminating the OFF indicator on the PASSENGER AIR BAG ON/OFF indicators. Then the PPS will communicate to the SDM through serial data communications that a PPS fault is present. The SDM will then disable the deployment of the instrument panel module and then illuminate the AIR BAG warning indicator.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

* The SDM has received a fault message from the PPS module.
* The PPS detects a wet seat fault if DTC B0074 0F is set.

Action Taken When the DTC Sets

* The SDM disables the instrument panel module deployment loop.
* The SDM will illuminate the OFF portion of the PASSENGER AIR BAG ON/OFF indicator.
* 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 (SIR System 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

Programming and Relearning (Programming and Relearning) for scan tool information

Circuit/System Testing

Note: The passenger presence system (PPS) is a calibrated unit. When replacing the assembly all parts in the service kit must remain together. Do not mix any of the old parts with the new parts. PPS comes in as part of a service kit which contains a seat foam, pressure sensor and a electronic control unit (ECU) module (if applicable).

When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:

* PPS module
* PPS sensor wiring harness

1. Verify that no other PPS DTCs are set.

• If other PPS DTCs are set, investigate those DTCs first.

2. Verify that DTC B0074 0F is not set.

• If the DTC is set, verify there are no electronic devices on the passenger seat. If not, then verify the seat is dry by removing the trim from the seat bottom frame. IF the seat is wet, allow 24-48 hours dry time. If the DTC is history, do not replace PPS. Clear PPS codes.

3. Verify that DTC B0074 00, B0074 0D, or B0074 0E is not set.

• If any of the DTCs are set then replace the PPS 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 PPS module replacement, setup, and programming