DTC B0081: Passenger Presence System

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle before using this diagnostic procedure.
• 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 0F: Passenger Presence System Erratic
• DTC B0081 11: Passenger Presence System Above Maximum Threshold
• DTC B0081 39: Passenger Presence System Internal Electronic Failure
• DTC B0081 3A: Passenger Presence System Incorrect Component Installed
• DTC B0081 4B: Passenger Presence System Calibration Not Learned
• DTC B0081 5A: Passenger Presence System Plausibility 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) perform tests to diagnose critical malfunctions within themselves. When the SDM has completed the power-up mode, it establishes communication with the PPS. The SDM also requests 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 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

All of the following conditions must exist for 5 seconds:

• The SDM has received a fault present message from the PPS.
• The PPS is in assembly plant mode and the SDM is in production mode.

Specific DTC Conditions

• B0081 0F: The SDM has received a fault present message from the PPS.
• B0081 11: The passenger presence module has failed preload procedure.
• 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 4B: The PPS is not calibrated.
• B0081 5A: The PPS detects a plausibility error.
• 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 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 sets with DTC B0081 5A as a history code, do not replace the passenger presence module.

Reference Information

Schematic Reference

SIR Schematics: See Air Bag Systems > Electrical > SIR Schematics

Connector End View Reference

Component Connector End Views: See Vehicle > Connector Views

Description and Operation

SIR System Description and Operation: See Air Bag Systems > Description and Operation

Electrical Information Reference

• Circuit Testing: See Vehicle > Component Tests and General Diagnostics > Circuit Testing
• Testing for Intermittent Conditions and Poor Connections: See Vehicle > Component Tests and General Diagnostics > Testing for Intermittent Conditions and Poor Connections
• Connector Repairs: See Vehicle > Component Tests and General Diagnostics > Connector Repairs
• Wiring Repairs: See Vehicle > Component Tests and General Diagnostics > Wiring Repairs

Scan Tool Reference

Control Module References: See Vehicle > Programming and Relearning > Control Module References for scan tool information

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:

• The PPS module
• The SDM module
• The PPS module harness connector
• The SDM wiring harness connector

1. Ignition ON, verify no PPS DTCs are set.
   If any PPS DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.
2. Verify the correct PPS part number is installed in the vehicle.
   If the correct PPS is installed, replace with the correct PPS.
3. Ignition OFF, disconnect the harness connector at the PPS module.
4. Ignition OFF, test for less than 10 ohms between the ground circuit terminal 4 and ground.
   If greater than the specified range, test the ground circuit for an open/high resistance.
5. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
   If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
6. Reconnect all PPS components and perform the passenger presence system rezero procedure.
7. Clear all DTCs and operate the vehicle within the conditions for running the DTC. DTC B0081 should not set as a current DTC.
   If DTC B0081 sets, replace the PPS.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See ALL Diagnostic Trouble Codes (DTC) > Verification Tests

Control Module References: See Vehicle > Programming and Relearning > Control Module References for PPS and SDM replacement, programming and setup.