Supplemental Inflatable Restraints
DTC B0081 (SDM)
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 00
- Passenger Presence Module Malfunction
DTC B0081 3A
- Passenger Presence Module Incorrect Component Installed
Circuit/System Description
When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) and the passenger presence module perform tests to diagnose critical malfunctions. Upon a successful power-up mode the SDM will illuminate both PASSENGER AIRBAG ON/OFF indicators located in the overhead center console. If the SDM detects a fault in the passenger presence module, it may disable the front passenger air bag deployment loop, set DTC B0081 00 or DTC B0081 3A and illuminate the AIRBAG indicator.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
Conditions for Setting the DTC
B0081 00
The SDM has received a fault present message from the passenger presence module.
B0081 3A
The SDM has received a message from the passenger presence module indicating a vehicle to passenger presence module mismatch.
Action Taken When the DTC Sets
* The SDM 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 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 [1][2]Air Bag Systems
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
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 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 system rezero procedure whenever a component is replaced.
Note: Both SDM and Passenger Presence Module set DTC B0081 but with different symptom 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.
1. Verify that DTC B1001 is not set in the SDM.
• If DTC B1001 is set in the SDM
• Refer to DTC B1001 Supplemental Inflatable Restraints.
• If DTC B1001 does not set in the SDM
2. Verify that DTC B0074, B101D, or B101E is not set in the passenger presence module.
• If any of these DTCs are set in the passenger presence module
• If any of the DTCs are set in the passenger presence module, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
• If none of these DTCs are set in the passenger presence module
Note: The SDM sets a redundant B0081 00 DTC when the passenger presence module sets a DTC B0081 11 or B0081 42.
3. Verify that DTC B0081 00 is not set in the SDM
• If DTC DTC B0081 00 is set in the SDM
• Refer to the PPS DTC B0081 (SDM) DTC B0081 (Passenger Presence Module) Passenger Presence Module.
• If DTC DTC B0081 00 is not set in the SDM
Note: The SDM sets a B0081 3A when an incorrect passenger presence module is installed.
4. Verify that DTC B0081 3A is not set in the SDM.
• If DTC DTC B0081 3A is set in the SDM
• Replace the K85 passenger presence module.
• If DTC DTC B0081 3A is not set in the SDM
5. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for passenger presence module and SDM replacement, setup, and programming