Diagnostic Instructions

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 requesting both of the PASSENGER AIR BAG ON/OFF indicators to illuminate 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 warning indicator.

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 5 seconds:

B0081 3A

B0081 39

B0081 71

The SDM has received invalid serial data from the PPS.

Action Taken When the DTC Sets

Conditions for Clearing the DTC

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

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

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.

•	PPS module

•	SDM module

•	PPS wiring harness connector

•	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.

2. Ignition ON, with the scan tool. Retrieve the DTCs, refer to Passenger Presence System Flash Code Procedures. Verify no PPS DTCs are set.

⇒	If the PPS has any current or history DTCs stored, refer to the Diagnostic Trouble Code (DTC) List - Vehicle.

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.