DTC 1055

DTC 1052, 1053, 1054, or 1055

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides and overview of each diagnostic category.



DTC Descriptors
DTC 1052
- PPS Preload Failure Region 1

DTC 1053
- PPS Preload Failure Region 2

DTC 1054
- PPS Preload Failure Region 3

DTC 1055
- PPS Preload Failure Region 4




Circuit/System Description

The passenger presence system (PPS) is divided up into 4 regions. When there is an unwanted force being applied to one or more PPS regions, the PPS will set a diagnostic trouble code (DTC). If the PPS detects any preload DTC within the PPS, it will communicate to the sensing and diagnostic module (SDM) through a non GMLAN communications circuit that a PPS fault is present. The SDM will set DTC B0081 indicating a problem within the PPS and will suppress the deployment of the instrument panel (I/P) module and turn the AIR BAG indicator ON.


Conditions for Running the DTC

Ignition voltage is between 9-16 volts.


Conditions for Setting the DTC





The PPS will set a DTC when a region has detected a preload/pressure on it, refer to chart below for specific region.






Action Taken When the DTC Sets

* The PPS will set a DTC for the appropriate region and communicate the fault to the SDM.
* The SDM will set DTC B0081 and commands the AIR BAG indicator ON.
* The PPS will illuminate the passenger air bag status OFF indicator.



Conditions for Clearing the DTC

* The PPS no longer senses the condition, and DTCs are cleared.
* A history DTC will clear once 255 malfunction-free ignition cycles have occurred.



Diagnostic Aids

* When passenger seat bottom trim cover is serviced or removed, the trim cover, when reinstalled may apply certain unwanted pressure to the PPS causing DTCs 1052-1055 to set.
* It may be necessary to perform the PPS preload test procedure more then once before condemning the 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 (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


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.


* PPS module

* PPS module wiring harness




1. Verify DTC 1051 is not set.

• If DTC 1051 is set as current, refer to DTC 1051 (DTC 1051) .

2. Verify that DTC 1052, 1053, 1054, or 1055 is not set.

• If DTC is set perform Passenger Presence System Preload Test (Programming and Relearning) . If DTC resets, replace the PPS.




Repair Instructions

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


Control Module References (Programming and Relearning)for PPS module replacement, setup, and programming