Buick Regal: DTC B0081 (Passenger Presence Module)
Diagnostic Instructions
- 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.
DTC Descriptors
DTC B0081 00
Passenger Presence Module Malfunction (sets in the Inflatable Restraint
Sensing and Diagnostic Module)
DTC B0081 11
Passenger Presence Module Above Threshold (Build Check Failure) (sets in the
Passenger Presence
Module)
DTC B0081 3A
Passenger Presence Module Incorrect Component Installed (sets in the
Inflatable Restraint Sensing and
Diagnostic Module)
DTC B0081 4B
Passenger Presence Module Calibration Not Learned (sets in the Passenger
Presence Module)
DTC B0081 5A
Passenger Presence Module Plausibility Failure (sets in the Passenger
Presence Module)
DTC B0081 71
Passenger Presence Module Invalid Serial Data Received (sets in Inflatable
Restraint Sensing and
Diagnostic Module)
Circuit/System Description
When the ignition is turned ON, the Passenger Presence Module and the
Inflatable Restraint Sensing and
Diagnostic Module performs tests to diagnose critical malfunctions within
itself. When the Inflatable Restraint
Sensing and Diagnostic Module has completed the power-up mode, the Inflatable
Restraint Sensing and
Diagnostic Module will establish communication with the Passenger Presence
Module. The Inflatable Restraint
Sensing and Diagnostic Module will also request the instrument panel cluster to
illuminate both of the
PASSENGER AIR BAG ON/OFF indicators for 5 seconds. If the Inflatable Restraint
Sensing and Diagnostic
Module detects that the Passenger Presence Module has set a current DTC, the
Inflatable Restraint Sensing and
Diagnostic Module will then disable the passenger instrument panel air bag
deployment loop, set DTC B0081,
and illuminate the AIR BAG 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 00
The Inflatable Restraint Sensing and Diagnostic Module has a general fault
present.
B0081 11
The Passenger Presence Module is above maximum threshold. The Passenger
Presence Module failed the
preload/build check.
B0081 3A
The Inflatable Restraint Sensing and Diagnostic Module has received a
mismatch message indicating the wrong
Passenger Presence Module is installed on the vehicle.
B0081 4B
The Passenger Presence Module is not calibrated. Preload procedure has not
been run.
B0081 5A
The Passenger Presence Module detects a plausibility error.
B0081 71
The Inflatable Restraint Sensing and Diagnostic Module has received invalid
or no serial data from the
Passenger Presence Module.
Action Taken When the DTC Sets
- 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.
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 inflatable restraint sensing and diagnostic module or passenger
presence module were replaced
verify that the correct part numbers were used for the vehicle application.
Reference Information
Schematic Reference
SIR Wiring Schematics
Connector End View Reference
Component Connector End View Index
Description and Operation
Supplemental Inflatable Restraint System Description and Operation
Electrical Information Reference
- Circuit Testing
- Testing for Intermittent Conditions and Poor Connections
- Connector Repairs
- Wiring Repairs
Scan Tool Reference
K85 Passenger Presence Module: Scan Tool Information for scan tool
information.
Circuit/System Verification
NOTE:
- When removing connectors inspect for damage, corrosion or poor
connection. Damage or corrosion in the following requires repair or
replacement of the affected component/connector.
- Passenger Presence Module
- Inflatable Restraint Sensing and Diagnostic Module
- Passenger Presence Module harness connector
- Inflatable Restraint Sensing and Diagnostic Module wiring harness
connector
1. Ignition ON, verify that DTC B0081 is the only DTC set in the Inflatable
Restraint Sensing and
Diagnostic Module or Passenger Presence Module.
- If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List -
Vehicle.
2. Verify DTC B0081 00, DTC B0081 3A, or DTC B0081 71 is not set in the
Inflatable Restraint Sensing
and Diagnostic Module. If any of these DTCs set in the Inflatable Restraint
Sensing and Diagnostic
Module diagnose the following:
- Inflatable Restraint Sensing and Diagnostic Module DTC B0081 00:
- If DTC B0081 00 sets in the Inflatable Restraint Sensing and
Diagnostic Module then refer to
step 3 and diagnose the Passenger Presence Module DTC B0081 5A. By
diagnosing the
Passenger Presence Module DTC B0081 5A, DTC B0081 00 will be fixed in
the Inflatable
Restraint Sensing and Diagnostic Module.
- Inflatable Restraint Sensing and Diagnostic Module DTC B0081 3A:
- Either an incorrect replacement Passenger Presence Module or
Inflatable Restraint Sensing
and Diagnostic Module was placed in this vehicle. Check and make sure
the part numbers are
correct for each module. If the part numbers are correct clear this DTC
and see if DTC B0081
3A resets as a current DTC. If DTC B0081 3A resets then replace the
Passenger Presence
Module. Clear DTCs again and check if DTC B0081 3A sets as current
again. If DTC B0081
3A sets again then replace the Inflatable Restraint Sensing and
Diagnostic Module.
- Inflatable Restraint Sensing and Diagnostic Module DTC B0081 71:
- If DTC B0081 71 sets in the Inflatable Restraint Sensing and
Diagnostic Module then refer to
the applicable Circuit/System Testing.
3. DTC B0081 11, DTC B0081 4B, or DTC B0081 5A is set in the Passenger
Presence Module, diagnose the
following:
- Passenger Presence Module DTC B0081 11:
- If DTC B0081 11 sets in the Passenger Presence Module if the correct
calibration was not
learned by the Passenger Presence Module. Make sure there is nothing on
the passenger seat,
not even a scan tool. Perform the Passenger Presence Module Preload
procedure, refer to
Passenger Presence System Re-Zeroing. Clear the DTC's and check if DTC
B0081 11 sets
again in the Passenger Presence Module. If DTC B0081 11 sets again
replace the Passenger
Presence Module.
- Passenger Presence Module DTC B0081 4B:
- If DTC B0081 4B sets in the Passenger Presence Module if the correct
calibration was not
learned by the Passenger Presence Module. Make sure there is nothing on
the passenger seat,
not even a scan tool. Perform the Passenger Presence Module Preload
procedure, refer to
Passenger Presence System Re-Zeroing. Clear the DTC's and check if DTC
B0081 11 sets
again in the Passenger Presence Module. If DTC B0081 11 sets again
replace the Passenger
Presence Module.
- Passenger Presence Module DTC B0081 5A:
- If DTC B0081 5A sets in the Passenger Presence Module check the
connections at the
Inflatable Restraint Sensing and Diagnostic Module and Passenger
Presence Module. Clear
the DTC's and check if DTC B0081 5A sets again as a current DTC in the
Passenger Presence
Module. If DTC B0081 5A sets then replace the Passenger Presence Module.
Clear DTCs
again and check if DTC B0081 5A sets as current again. If DTC B0081 5A
sets again then
replace the Inflatable Restraint Sensing and Diagnostic Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
NOTE: The following steps must be completed before using the symptom
tables:
1. Perform the Diagnostic System Check - Vehicle before using the HVAC System
Malfunction
procedure in order to verify that all of the following are true:
There are no DTCs set.
The control modules can communicate via
Preliminary Procedure
1. Raise and support the vehicle.
2. Remove the Differential Carrier Assembly.
Rear Axle Vent
NOTE:
Use an appropriate tool to remove and install.
REAR AXLE HOUSING VENT REPLACEMENT
Preliminary Procedure
1. Raise and support the vehicle.
2. Remove the Differential Ca