B0074

DTC B0074

Diagnostic Instructions

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

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 continuosly. 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.

Diagnostic Aids

- If either the SDM or PPS were replaced verify that the correct part numbers were used for the vehicle application.
- If this DTC is set as either current or history it may have been caused by an electronic device. If an electronic device (Computers, MP3 Players, Cell Phones, Diagnostic Scan Tool, etc.) was placed on the passenger seat the passenger presence module may command the passenger air bag indicator to turn on and/or command the passenger seat belt indicator to turn on. Make sure there are no objects on the passenger seat and clear the DTCs. If this DTC resets then perform this diagnostic. If the DTC does not reset there is no further work needed on the passenger presence system.
- If this DTC is set as either current or history it may have been caused by an aftermarket seat heater. The aftermarket seat heater may command the passenger air bag indicator to turn on and/or command the passenger seat belt indicator to turn on. Remove the aftermarket seat heater from the passenger seat and clear the DTCs. If this DTC resets then perform this diagnostic. If the DTC does not reset there is no further work needed on the passenger presence system.

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 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 for scan tool information Programming and Relearning.

Circuit/System Verification

Note: This system allows you to service each component separately (module and sensor/sensing mat). Perform a 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 sensor
- Passenger presence sensor harness 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.
-> The status changes

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

-> The status does not change

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
-> The status changes
-> 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.
-> The status does not change
3. All OK.

Circuit/System Testing

Note: This system allows you to service each component separately (module and sensor/sensing mat). Perform a 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 module and sensor connectors are fully seated.
2. Verify DTC B0074 is not set.

-> DTC B0074 is set.
-> Replace the B60 passenger presence sensor.

-> DTC B0074 does not set.

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure Verification Tests.
Control Module References for passenger presence sensor and SDM replacement, setup, and programming Programming and Relearning.