Passenger Presence Module
DTC B0081 (Passenger Presence Module)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0081 11
- Passenger Presence Module High Input
DTC B0081 4B
- Passenger Presence Module Calibration Not Learned
DTC B0081 5A
- Passenger Presence Module Not Plausible
Circuit/System Description
When the ignition is turned ON, the sensing and diagnostic module(SDM) and the passenger presence detection module perform tests to diagnose critical malfunctions. Upon a successful power-up mode the SDM will illuminate both PASSENGER AIRBAG ON/OFF indicators. If the SDM detects a fault in the passenger presence detection module, it may disable the passenger instrument panel air bag deployment loop, set DTC B0081 and illuminate the AIRBAG indicator.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
Conditions for Setting the DTC
Any of the following conditions must exist for 5 seconds.
B0081 11
The passenger presence detection module has failed the preload procedure.
B0081 4B
The passenger presence detection module is not calibrated.
B0081 5A
The passenger presence detection module sets this code when the passenger presence detection module has lost communication with the SDM.
Action Taken When the DTC Sets
* The SDM requests the instrument cluster to illuminate the AIR BAG indicator.
* 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 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, etc.) was placed on the passenger seat the passenger presence detection 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.
Reference Information
Description and Operation
SIR System Description and Operation Description and Operation
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Note:
* This system is serviced as a kit (seat foam, module and sensing mat). Perform a passenger presence system preload procedure whenever a component is replaced. Refer to Passenger Presence System Programming and Setup Programming and Relearning.
* Both K36 inflatable restraint sensing and diagnostic module and K85 passenger presence detection module set DTC B0081 but with different symptoms bytes. Therefore it is important to identify which module has set the DTC B0081. Use the symptom bytes as a way of identify the correct module to diagnose.
* The K36 inflatable restraint sensing and diagnostic module sets a B0081 3A when an incorrect K85 passenger presence detection module is installed.
1. 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 detection module.
• If DTC B0081 3A is not set in the K36 inflatable restraint sensing and diagnostic module
Note: The K36 inflatable restraint sensing and diagnostic module sets a redundant B0081 00 DTC when the K85 passenger presence detection module sets a DTC B0081 11 or B0081 4B.
2. Verify that DTC B0081 11 or DTC B0081 4B is not set in the K85 passenger presence detection module.
• If DTC B0081 11 or DTC B0081 4B is set in the K85 passenger presence detection module
Perform the passenger presence system preload procedure. Refer to Passenger Presence System Programming and Setup Programming and Relearning.
• If neither of these DTCs are set in the K85 passenger presence detection module
3. Verify DTC B0081 5A is not set in the K85 passenger presence detection module.
• If DTC B0081 5A is set in the K85 passenger presence detection module
1. Verify the connections at the K36 inflatable restraint sensing and diagnostic module and K85 passenger presence detection 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 detection module.
• If DTC B0081 5A sets, replace the K85 passenger presence detection module.
• If DTC B0081 5A does not set
4. All OK.
• If DTC B0081 5A is not set in the K85 passenger presence detection module
4. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Control Module References for passenger presence system or SDM replacement, programming and setup