Operation CHARM: Car repair manuals for everyone.
Home >> Cadillac >> 2012 >> CTS Coupe RWD V6-3.6L >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0081

B0081




DTC B0081

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 00
- Passenger Presence Module Malfunction (sets in the SDM)

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 SDM)

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)

Circuit/System Description

When the ignition is turned ON, the passenger presence module and 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 module. The SDM will also request the instrument panel cluster to illuminate both of the PASSENGER AIR BAG ON/OFF indicators for 5 seconds. If the SDM detects that the passenger presence module has set a current DTC, the SDM 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 SDM 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 SDM 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.

Action Taken When the DTC Sets

* The SDM requests the instrument panel cluster (IPC) 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 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
Schematic Reference

SIR Schematics [1][2]Air Bag Systems
Connector End View Reference

Component Connector End Views Connector Views
Description and Operation

SIR System Description and Operation SIR System
Electrical Information Reference

* Circuit Testing Circuit Testing
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Connector Repairs Connector Repairs
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Important:
* 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

* SDM

* Passenger presence module harness connector

* SDM wiring harness connector


1. Ignition ON, verify that DTC B0081 is the only DTC set in the SDM or passenger presence module.

• If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle

2. Verify DTC B0081 00, or DTC B0081 3A is not set in the SDM. If any of these DTCs set in the SDM diagnose the following:

* SDM DTC B0081 00:

• If DTC B0081 00 sets in the SDM 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 SDM.

* SDM DTC B0081 3A:

• Either an incorrect replacement passenger presence module or SDM was placed in this vehicle. Check and make sure the part #'s are correct for each module. If the part #'s 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 SDM.

3. Verify DTC B0081 11, DTC B0081 4B, or DTC B0081 5A is not set in the passenger presence module. If any of these DTCs set in the passenger presence module diagnose the following:

* PPS 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 PPS Preload procedure, refer to Passenger Presence System Preload Test Passenger Presence System Preload Test. 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.

* PPS 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 PPS Preload procedure, refer to Passenger Presence System Preload Test Passenger Presence System Preload Test. 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.

* PPS DTC B0081 5A:

• If DTC DTC B0081 5A sets in the passenger presence module check the connections at the SDM and passenger presence module. Clear the DTC's and check if DTC B0081 5A sets again 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 SDM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
* Control Module References Control Module References for passenger presence system and SDM replacement, setup, and programming

pro multis · About Operation CHARM