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 01
- Passenger Presence Sensor Short to Battery

DTC B0074 02
- Passenger Presence Sensor Short to Ground

DTC B0074 08
- Passenger Presence Sensor Performance - Signal Invalid

DTC B0074 11
- Passenger Presence Sensor High Input

Circuit/System Description

The passenger presence module monitors the sensor status continually. Whenever the sensor mat 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 01

The passenger presence module has detected a short to voltage.

B0074 02

The passenger presence module has detected a short to ground.

B0074 08

The passenger presence module has detected an invalid signal.

B0074 11

The passenger presence module has detected a short to voltage.

Action Taken When the DTC Sets

The SDM requests the instrument panel 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 inflatable restraint sensing and diagnostic module or passenger presence module were replaced verify that 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

* 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 Testing

Note: This system is serviced as a kit (module and sensing mat). Perform Passenger Presence System Programming and Setup Programming and Relearning 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 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. Confirm that all passenger presence module and sensor connectors are fully seated.

2. Verify DTC B0074 is not set.

• If DTC B0074 is set
Replace the K85 passenger presence module.

• If DTC B0074 does not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Programming and Relearning for passenger presence system and inflatable restraint sensing and diagnostic module replacement, programming and setup