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 Presence Sensor Circuit Malfunction

DTC B0074 04
- Passenger Presence Sensor Open

Circuit/System Description

The passenger presence module monitors the passenger presence sensor status continually. Whenever the passenger presence sensor has an internal malfunction, the passenger presence module will set DTC B0074.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B0074 00

The passenger presence module has detected a disconnection from the passenger presence sensor.

B0074 04

The passenger presence module has detected an open circuit.

Action Taken When the DTC Sets

The SDM will set a DTC B0081 00 after receiving a fault present message from the passenger presence module and requests the instrument cluster 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 (Electrical Diagrams)
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 (Circuit Testing)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Connector Repairs (Connector Repairs)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

Note: This system allows you to service each component separately (module and/or sensing mat). Perform a Passenger Presence System Rezeroing (Passenger Presence System Rezeroing) procedure whenever a component is replaced. Inspect the following component connectors for damage or corrosion. Repair or replace the affected component/connector:

* Passenger presence module
* Passenger presence module harness connector
* Seat wiring harness to vehicle harness connector

The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click.

1. Observe with the scan tool if the fault changes status while moving the passenger seat forward and backward through its full range of motion. The status should stay consistent.

• If the status changes this could be indication of a seat to vehicle harness connection issue, refer to Circuit/System Testing.

2. Observe with the scan tool if the fault changes status while moving the harness near each connector listed below. The status should stay consistent.

* Passenger presence module
* Passenger presence sensor
* Any seat harness inline

• If the reading is erratic while moving the harness, perform the following:

* Inspect each connector terminal for damage or corrosion and repair as necessary.
* Insure each connector and CPA is correctly seated.

Circuit/System Testing

Note: This system allows you to service each component separately (module and/or sensing mat). Perform a Passenger Presence System Rezeroing (Passenger Presence System Rezeroing) whenever a component is replaced. Inspect component connectors for damage or corrosion. Repair or replace the affected component/connector:

1. Confirm that all Passenger presence system connectors are fully seated.
2. Verify DTC B0074 is not set.

• If the DTC is set, replace the B60 passenger presence sensor.

Repair Instructions

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

Inflatable Restraint Front Passenger Mass Sensor Replacement (Inflatable Restraint Front Passenger Mass Sensor Replacement)