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.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
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 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 passenger presence system (PPS). The PPS will respond by commanding both of the PASSENGER AIR BAG ON/OFF indicators ON 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 has 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 illuminate the AIR BAG indicator.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
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 commands the AIR BAG indicator ON.
* The I/P module 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.
Reference Information
Schematic Referance
SIR Schematic Electrical Diagrams
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
Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
* The PPS module
* The SDM module
* The PPS wiring harness connector
* The SDM wiring harness connector
1. Ignition ON, verify the PPS illuminates the PPS ON/OFF indicators.
• If the Passenger Air Bag ON/OFF status indicator does not illuminate, refer to Passenger Presence System Indicator Circuit Malfunction. Passenger Presence System Indicator Circuit Malfunction
2. Ignition ON, with the scan tool. Retrieve the DTCs, refer to Passenger Presence System Flash Code Procedures. Verify no PPS DTCs are set. Passenger Presence System Flash Code Procedures
• If the PPS has any current or history DTCs stored, refer to the Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
3. Verify that the correct PPS was installed into the vehicle.
• If the wrong PPS was installed then replace with the correct PPS.
4. Ignition OFF, disconnect the harness connector at PPS module.
5. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 5 and ground.
• If not within the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PPS module.
6. Ignition ON, engine ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 9 and ground.
• If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance.
7. Ignition OFF, disconnect the harness connector at the SDM.
8. Test for less than 1.0 ohm along the occupant sensor serial data circuit terminal 18 to terminal 60.
• If not within the specified range, test the signal circuit for an open/high resistance.
9. If all circuits test normal, test or 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, setup, and programming. Programming and Relearning