Chevrolet Trax: DTC B0081: Passenger presence module

Diagnostic Instructions

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

DTC Descriptors

DTC B0081 11

Passenger Presence Module High Input

DTC B0081 4B

Passenger Presence Module Calibration Not Learned

Circuit/System Description

When the ignition is turned ON, the Inflatable Restraint Sensing and Diagnostic Module and the Passenger Presence Module perform tests to diagnose critical malfunctions. Upon a successful power-up mode the Inflatable Restraint Sensing and Diagnostic Module will illuminate both PASSENGER AIRBAG ON/OFF indicators. If the Inflatable Restraint Sensing and Diagnostic Module detects a fault in the Passenger Presence Module, it may disable the passenger instrument panel air bag deployment loop, set DTC B0081 and illuminate the AIRBAG indicator.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

Any of the following conditions must exist for 5 seconds.

B0081 11

The Passenger Presence Module has failed the preload procedure.

B0081 4B

The Passenger Presence Module is not calibrated.

Action Taken When the DTC Sets

• The Inflatable Restraint Sensing and Diagnostic Module requests the instrument cluster to illuminate the AIR BAG indicator.
• The passenger instrument panel air bag deployment loop will be disabled.

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 system were replaced verify that the correct part numbers were used for the vehicle application.
• An 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.
• If this DTC is set as either current or history it may have been caused by:

• An aftermarket seat heater
• A scan tool, laptop, or other electronic device is in the seat
• The seat is damp or wet
• An object is in the seat

Reference Information

Description and Operation

Supplemental Inflatable Restraint System Description and Operation

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Use the table below in identifying specific module DTC B0081 application and symptom byte that sets with it.

NOTE:

• This system is serviced as a kit (seat foam, module and sensing mat).

  Perform a passenger presence system preload procedure whenever a component is replaced. Refer to Passenger Presence System Programming and Setup .

• Both Inflatable Restraint Sensing and Diagnostic Module and Passenger Presence Module set DTC B0081 but with different symptoms bytes.

  Therefore it is important to identify which module has set the DTC B0081.

  Use the symptom bytes as a way of identify the correct module to diagnose.

• The Inflatable Restraint Sensing and Diagnostic Module sets a B0081 3A when an incorrect Passenger Presence Module is installed.

1. Verify that DTC B0081 3A is not set in the Inflatable Restraint Sensing and Diagnostic Module.

• If DTC B0081 3A is set in the Inflatable Restraint Sensing and Diagnostic Module

Replace the K85 Passenger Presence Module.

• If DTC B0081 3A is not set in the Inflatable Restraint Sensing and Diagnostic Module

NOTE: The Inflatable Restraint Sensing and Diagnostic Module sets a B0081 00 DTC when the Passenger Presence Module sets a DTC B0081 11 or B0081 4B.

2. Verify that DTC B0081 11 or DTC B0081 4B is not set in the Passenger Presence Module.

• If DTC B0081 11 or DTC B0081 4B is set in the Passenger Presence Module

Perform the passenger presence system rezero procedure. Refer to Passenger Presence System Programming and Setup .

• If DTC B0081 11 or DTC B0081 4B is not set in the Passenger Presence Module

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Passenger Presence Module or Inflatable Restraint Sensing and Diagnostic Module replacement, programming and setup

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