B0081

DTC B0081

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.



DTC Descriptors
DTC B0081 39
- Replace AOS (Automatic Occupancy Sensing)

DTC B0081 3A
- Incorrect AOS Installed (Automatic Occupancy Sensing)

DTC B0081 5A
- AOS Not Configured (Automatic Occupancy Sensing)

DTC B0081 71
- AOS Range/Performance (Automatic Occupancy Sensing)




Circuit/System Description

When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint sensing and diagnostic module (SDM) performs tests to diagnose critical malfunctions within itself. When the SDM has completed the power-up mode, the SDM will establish communication with the PPS. The SDM will also request the instrument panel cluster to command both of the PASSENGER AIR BAG ON/OFF indicators ON for 5 seconds. If the SDM detects that the PPS has set a current DTC, the SDM will then disable the instrument panel (I/P) module deployment loop, set DTC B0081, and command the AIR BAG indicator ON.


Conditions for Running the DTC

Ignition voltage is between 9-16 volts.


Conditions for Setting the DTC

Any of the following conditions must exist for 1 second:

B0081 39

The SDM has received a fault message from the PPS.

B0081 3A

The SDM has received a message from the PPS indicating a vehicle and PPS mismatch.

B0081 71

The SDM has received invalid or no serial data from the PPS.


Action Taken When the DTC Sets

* The SDM commands the AIR BAG indicator ON.
* The I/P module deployment loop will be disable.



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.


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 (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Circuit/System Verification


Important:
* A DTC B0081 set in history may not clear until the PPS module enters the sleep mode.

* When removing connectors inspect for damage, corrosion or poor connection. Damage or corrosion in the following requires repair or replacement of the affected component/connector.



* The PPS module

* The SDM module

* The PPS module harness connector

* The SDM wiring harness connector



1. Ignition ON, retrieve DTCs from the PPS.
2. Verify that DTC B0081 3A is not set as current.

• If DTC B0081 3A is current, replace the PPS with the correct part number.

3. Verify DTC B0081 39 is not set as current.

• If DTC B0081 39 is current, replace the PPS.

4. Verify DTC B1000, B1001, or U0170 is not set as current.

• If DTC B1000, B1001, or U0170 is current, refer to .

5. Verify DTC B0081 71 is not set.

• If DTC B0081 71 is set, clear the SDM DTCs. No other repairs are necessary.




Clearing DTC B0081
1. To enter the sleep mode, remove the scan tool, turn the ignition OFF, open and close the driver door.
2. With the ignition OFF and all doors closed, wait 30 seconds .
3. Clear DTC B0081. The DTC should now be cleared.



Repair Instructions

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


Control Module References (Programming and Relearning)for PPS and SDM replacement, setup, and programming