• Perform the Diagnostic System Check - Vehicle prior to 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.

When the ignition is turned ON, the inflatable restraint sensing and diagnostic module and the passenger presence module perform tests to diagnose critical malfunctions. Upon a successful power-up mode the inflatable restraint sensing and diagnostic module will illuminate both PASSENGER AIRBAG ON/OFF indicators. If the inflatable restraint sensing and diagnostic module detects a fault in the passenger presence module, it may disable the passenger instrument panel air bag deployment loop, set DTC B0081 and illuminate the air bag indicator.

Ignition voltage is between 9–16 V.

Any of the following conditions must exist for 5 s.

The passenger presence module has failed the rezero procedure.

The passenger presence module is not calibrated.

The passenger presence module sets this code when the passenger presence module has lost communication with the inflatable restraint sensing and diagnostic module.

• The inflatable restraint sensing and diagnostic module requests the instrument cluster to illuminate the AIR BAG indicator.
• The passenger instrument panel air bag deployment loop will be disabled.

• The condition for setting the DTC no longer exists.
• A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

• Refer to SIR Disabling and Enabling.
• Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with a reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections.
• If either the inflatable restraint sensing and diagnostic module or passenger presence module were replaced verify that the correct part numbers were used for the vehicle application.
• If this DTC is set as either current or history it may have been caused by an electronic device. If an electronic device (Computers, MP3 Players, Cell Phones, Diagnostic Scan Tool, Power Inverter, etc.) was placed on the passenger seat the passenger presence module may command the passenger air bag indicator to turn on and/or command the passenger seat belt indicator to turn on. Make sure there are no objects on the passenger seat and clear the DTCs. If this DTC resets then perform this diagnostic. If the DTC does not reset there is no further work needed on the passenger presence system.
• If this DTC is set as either current or history it may have been caused by an aftermarket seat heater. The aftermarket seat heater may command the passenger air bag indicator to turn on and/or command the passenger seat belt indicator to turn on. Remove the aftermarket seat heater from the passenger seat and clear the DTCs. If this DTC resets then perform this diagnostic. If the DTC does not reset there is no further work needed on the passenger presence system.

Supplemental Inflatable Restraint System Description and Operation

K85 Passenger Presence Module: Scan Tool Information for scan tool information

1. Verify that the seat is free of any objects or an aftermarket seat heater.
• If objects and/or an aftermarket seat heater is present
1. Remove objects and/or aftermarket seat heater.
2. Ignition ON, clear the DTC.
3. Verify that DTC B0081 is not set
• If the DTC B0081 is set, replace the K85 Passenger Presence Module
• If the DTC B0081 is not set
4. All OK.
• If the seat is empty and does not have an aftermarket seat heater
2. Verify that DTC B0081 3A is not set in the K36 Inflatable Restraint Sensing and Diagnostic Module.
• If DTC B0081 3A is set in the K36 Inflatable Restraint Sensing and Diagnostic Module

  Replace the K85 Passenger Presence Module.

• If DTC B0081 3A is not set in the K36 Inflatable Restraint Sensing and Diagnostic Module
3. Verify that DTC B0081 11 or DTC B0081 4B is not set in the K85 Passenger Presence Module.

Note: The K36 Inflatable Restraint Sensing and Diagnostic Modulesets a redundant B0081 00 DTC when the K85 Passenger Presence Module sets a DTC B0081 11 or B0081 4B.

• If DTC B0081 11 or DTC B0081 4B is set in the K85 Passenger Presence Module

  Perform the passenger presence system rezero procedure. Refer to Passenger Presence System Rezeroing.

• If neither of these DTCs are set in the K85 Passenger Presence Module
4. Verify DTC B0081 5A is not set in the K85 Passenger Presence Module.
• If DTC B0081 5A is set in the K85 Passenger Presence Module
1. Verify the connections at the K36 Inflatable Restraint Sensing and Diagnostic Module and K85 Passenger Presence Module, for terminal corrosion, properly seated connectors, and the connector position assurance is installed.
2. Clear the DTC.
3. Verify DTC B0081 5A does not set in the K85 Passenger Presence Module.
• If DTC B0081 5A sets, replace the K85 Passenger Presence Module.
• If DTC B0081 5A does not set
4. All OK.
• If DTC B0081 5A is not set in the K85 Passenger Presence Module
5. All OK.

Perform the Diagnostic Repair Verification after completing the repair.