Supplemental Inflatable Restraints (Inflatable Restraint Sensing and Diagnostic Module)

DTC B0081 (Inflatable Restraint Sensing and Diagnostic 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 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 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 and/or illuminate the AIRBAG indicator.

Conditions for Running the DTC

Ignition voltage is between 9-16 V.

Conditions for Setting the DTC

B0081 00

The inflatable restraint sensing and diagnostic module has received a fault present message from the passenger presence module.

B0081 3A

The inflatable restraint sensing and diagnostic module has received a message from the passenger presence module indicating a vehicle and passenger presence module mismatch.

B0081 71

The inflatable restraint sensing and diagnostic module has received invalid data from the passenger presence 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.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Supplemental Inflatable Restraint 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: Both K36 inflatable restraint sensing and diagnostic module and K85 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 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, B0081, B101D, or B101E is not set in the K85 Passenger Presence Module.

• If any of these DTCs are set in the K85 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 K85 Passenger Presence Module

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

Note: The K36 inflatable restraint sensing and diagnostic module sets a DTC B0081 3A when an incorrect K85 Passenger Presence Module is installed.

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

• If DTC B0081 symptom byte 3A or 71 is not set in the K36 inflatable restraint sensing and diagnostic module

4. 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