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Home >> Buick >> 2012 >> LaCrosse AWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0081 >> Supplemental Inflatable Restraints

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

DTC B0081 71
- Passenger Presence Module Invalid Data

Circuit/System Description

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module (SDM) and the passenger presence detection module perform tests to diagnose critical malfunctions. Upon a successful power-up mode the SDM will illuminate both PASSENGER AIRBAG ON/OFF indicators. If the SDM detects a fault in the passenger presence detection module, it may disable the 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 detection module.

B0081 3A

The SDM has received a message from the passenger presence detection module indicating a vehicle and passenger presence module mismatch.

B0081 71

The SDM has received invalid data from the passenger presence detection module.

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 detection 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 detection 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 detection system.

Reference Information
Schematic Reference

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

Component Connector End Views Connector End Views By Name
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 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 Programming and Setup Programming and Relearning.
* Both K36 inflatable restraint sensing and diagnostic module and K85 passenger presence detection 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 K36 inflatable restraint sensing and diagnostic module.

• If DTC B1001 is set in the K36 inflatable restraint sensing and diagnostic module
Refer to DTC B1001 Supplemental Inflatable Restraints.

• If DTC B1001 is not set in the K36 inflatable restraint sensing and diagnostic module

2. Verify that DTC B0074, B101D, or B101E is not set in the K85 passenger presence detection module.

• If any of these DTCs are set in the K85 passenger presence detection module
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If none of these DTCs are set in the K85 passenger presence detection module

Note: The K36 inflatable restraint sensing and diagnostic module sets a redundant B0081 00 DTC when the K85 passenger presence detection module sets a DTC B0081 11 or B0081 4B.

3. Verify that DTC B0081 00 is not set in the K36 inflatable restraint sensing and diagnostic module

• If DTC B0081 00 is set in the K36 inflatable restraint sensing and diagnostic module
Refer to B0081 (Passenger Presence Module) for diagnosis.

• If DTC B0081 00 is not set in the K36 inflatable restraint sensing and diagnostic module

Note: The K36 inflatable restraint sensing and diagnostic module sets a B0081 3A when an incorrect K85 passenger presence detection module is installed.

4. Verify that DTC B0081 symptom byte 3A or 71 is not set in the K36 inflatable restraint sensing and diagnostic module.

• If DTC B0081 symptom byte 3A or 71 is set in the K36 inflatable restraint sensing and diagnostic module
Replace the K85 passenger presence detection module.

• If DTC B0081 symptom byte 3A or 71 is not set in the K36 inflatable restraint sensing and diagnostic 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 system and SDM replacement, programming and setup

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