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 42
- Passenger Presence Module Calibration Not Programmed
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 located in the overhead center console. If the Inflatable Restraint Sensing and Diagnostic Module detects a fault in the Passenger Presence Module, it may disable the front passenger 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 42
The Passenger Presence Module Rezero procedure has failed.
B0081 11
The Passenger Presence Module has failed the Passenger Presence Module Rezero procedure.
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 allows you to service each component separately (module and sensor/sensing mat). Perform a passenger presence rezero procedure whenever a component is replaced.
Note: The Inflatable Restraint Sensing and Diagnostic Module and Passenger Presence Module can 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. Use the table below in identifying specific module DTC B0081 application and symptom byte that sets with it.
Note: 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 42.
2. Verify that DTC B0081 11 or DTC B0081 42 is not set in the Passenger Presence Module.
• If DTC B0081 11 or DTC B0081 42 is set in the Passenger Presence Module
Perform the passenger presence system rezero procedure. Refer to Passenger Presence System Rezeroing Passenger Presence System Rezeroing.
• If DTC B0081 11 or DTC B0081 42 do not set in the Passenger Presence Module
3. 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 and Inflatable Restraint Sensing and Diagnostic Module replacement, programming and setup