Passenger Presence Module

DTC B0081 (Passenger Presence Module)

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 B0081 11
- Passenger Presence Module High Input

DTC B0081 4B
- Passenger Presence Module Calibration Not Learned

DTC B0081 5A
- Passenger Presence Module Not Plausible

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 air bag 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.

B0081 5A

The Passenger Presence Module sets this code when the Passenger Presence Module has lost communication with the Inflatable Restraint Sensing and Diagnostic Module.

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 Module 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, Power Inverter, 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

Description and Operation

SIR System Description and Operation Description and Operation

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

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 Passenger Presence System Programming and Setup.

* Both K36 Inflatable Restraint Sensing and Diagnostic Module and K85 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 K36 Inflatable Restraint Sensing and Diagnostic Module sets a B0081 3A when an incorrect K85 Passenger Presence Module is installed.

1. Verify that the seat is free of any objects or an aftermarket seat heater.

• If objects and/or an aftermarket seat heater is present

1. Remove objects and/or aftermarket seat heater.

2. Ignition ON, clear the DTC.

3. Verify that DTC B0081 is not set

• If the DTC B0081 is set, replace the B60 Passenger Presence Sensor

• If the DTC B0081 is not set

4. All OK.

• If the seat is empty and does not have an aftermarket seat heater

2. Verify that DTC B0081 3A is not set in the K36 Inflatable Restraint Sensing and Diagnostic Module.

• If DTC B0081 3A is set in the K36 Inflatable Restraint Sensing and Diagnostic Module
Replace the K85 Passenger Presence Module.

• If DTC B0081 3A is not set in the K36 Inflatable Restraint Sensing and Diagnostic Module

3. Verify that DTC B0081 11 or DTC B0081 4B is not set in the K85 Passenger Presence Module.

Note: The K36 Inflatable Restraint Sensing and Diagnostic Module sets a redundant B0081 00 DTC when the K85 Passenger Presence Module sets a DTC B0081 11 or B0081 4B.

• If DTC B0081 11 or DTC B0081 4B is set in the K85 Passenger Presence Module
Perform the passenger presence system preload procedure. Refer to Passenger Presence System Programming and Setup Passenger Presence System Programming and Setup.

• If neither of these DTCs are set in the K85 Passenger Presence Module

4. Verify DTC B0081 5A is not set in the K85 Passenger Presence Module.

• If DTC B0081 5A is set in the K85 Passenger Presence Module

1. Verify the connections at the K36 Inflatable Restraint Sensing and Diagnostic Module and K85 Passenger Presence Module, for terminal corrosion, properly seated connectors, and the connector position assurance is installed.

2. Clear the DTC.

3. Verify DTC B0081 5A does not set in the K85 Passenger Presence Module.

• If DTC B0081 5A sets, replace the K85 Passenger Presence Module.

• If DTC B0081 5A does not set

4. All OK.

• If DTC B0081 5A is not set in the K85 Passenger Presence Module

5. All OK.

Repair Instructions

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

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