B0081

DTC B0081

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

DTC Descriptors

DTC B0081 3A: Passenger Presence System Incorrect Component Installed

DTC B0081 39: Passenger Presence System Internal Electronic Failure

DTC B0081 71: Passenger Presence System Invalid Serial Data Received

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 illuminate both of the PASSENGER AIR BAG ON/OFF indicators for 5 seconds. The SDM will then transmit a request message to the PPS to receive the PPS verification ID. The PPS will transmit the verification ID to the SDM, and the SDM will compare the ID received to data stored in memory. If the data stored in memory does not match the information transmitted by the PPS or the SDM detects that the PPS has set a current DTC, the SDM will then disable the passenger instrument panel air bag deployment loop, set DTC B0081, and illuminates the SIR system AIR BAG indicator.

Conditions for Running the DTC
Ignition voltage is between 9-16 V.

Conditions for Setting the DTC
All of the following conditions must exist for 5 seconds:

B0081 3A
• The SDM has received an ID message from the PPS which does not match the ID stored in the SDM memory.
• The SDM has reset the PPS twice without detecting the correct ID message.

B0081 39
• The SDM has received a NOK message from the PPS.
• The SDM has not received a message.

B0081 71
The SDM has received invalid serial data from the PPS.

Action Taken When the DTC Sets
• The SDM illuminates the SIR system AIR BAG indicator via serial data communications.
• 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 recently 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 Circuit Testing
• Connector Repairs Connector Repairs
• Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs Wiring Repairs

Scan Tool Reference
Control Module References for scan tool information Control Module References

Circuit/System Testing

Note: When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:
• PPS module
• SDM
• PPS module harness connector
• SDM wiring harness connector

1. Ignition ON, Verify the passenger air bag ON/OFF indicators illuminate.
- If the indicators do not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction. Passenger Presence System Indicator Circuit Malfunction

2. Ignition ON, use the scan tool and access the passenger presence system (PPS) menu. Retrieve the PPS DTC codes. Verify no PPS DTCs are set.
- If any PPS DTCs are set as current or history, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code (DTC) List - Vehicle

3. Verify the correct PPS part number is installed in the vehicle.
- If the wrong PPS was installed, replace with the correct PPS.

4. Ignition OFF, disconnect the harness connector at the PPS module.

5. Ignition OFF, test for less then 5 ohms between the ground circuit terminal D and ground.
- If greater then the specified range, test the ground circuit for an open/high resistance.

6. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal A and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the PPS module.

7. If all circuits test normal, replace the SDM.

Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
• SIR/SRS Wiring Repairs
• Control Module References for PPS and SDM replacement, programming and setup. Control Module References