Sensing and Diagnostic Module

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 System Malfunction

DTC B0081 3A
- Passenger Presence System 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 instrument panel 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 and 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.

Reference Information
Schematic Reference

SIR Schematics ([1][2]Air Bag Systems)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

SIR System Description and Operation (SIR System 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 Verification

Note:
* This system is serviced as a kit (seat foam, module and/or sensing mat). Perform a passenger presence system preload procedure whenever a component is replaced. Refer to Passenger Presence System Preload Test (Passenger Presence System Preload Test).
* 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.

1. Verify that DTC B1001 is not set in the SDM.

• If the DTC is set in the SDM, refer to DTC B1001 (B1001).

2. Verify that DTC B0074, B101D, or B101E is not 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).

Note: The SDM sets a redundant B0081 00 DTC when the passenger presence module sets a DTC B0081 11 or B0081 4B.

3. Verify that DTC B0081 00 is not set in the SDM

• If DTC B0081 00 is set in the SDM, then the passenger presence module has set a B0081 11 or a B0081 4B. Refer to B0081 (Passenger Presence Module) for diagnosis.

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 B0081 3A is set in the SDM, replace the K85 passenger presence module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for passenger presence module and SDM replacement, setup, and programming