DTC 052

DTC 052

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) provide an overview of each diagnostic category.

DTC Descriptor
DTC 052
- Heated Seat Ground Fault

Circuit/System Description

The seat heater mat which is a part of the heated seat system is calibrated as a part of the inflatable restraint Passenger Presence System (PPS). If the vehicle is equipped with a front passenger seat heater (KA1), the PPS continuously monitors for faults from the heated seat element. If the PPS determines there is a short to ground in the heated seat element supply circuit, the PPS will set DTC 052, illuminate the passenger air bag status OFF indicator and notify the sensing and diagnostic module (SDM) of a fault in the PPS through a non GMLAN communications circuit. The SDM will then illuminate the air bag indicator to ON, and set DTC B0092 indicating a problem within the PPS and will suppress the deployment of the instrument panel (I/P) module. The heater seat mat along with the PPS is a calibrated system and must be replaced as a complete unit.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The PPS has detected the heated seat element supply circuit voltage is out of range.

Action Taken When the DTC Sets

* The PPS will set a DTC 052, and then communicate with the SDM via non GMLAN circuit.
* The PPS will also set DTC 056 indicating a PPS internal system fault has occurred until the re-zeroing procedure was performed.
* The SDM will set DTC B0092.
* The SDM disables the I/P module deployment loop.
* The PPS will illuminate the passenger air bag status OFF indicator.
* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
* A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Diagnostic Aids

If there is a fault in the passenger heated seat element supply circuit, the entire PPS system must be replaced.

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) for scan tool information

Circuit/System Testing

1. Ignition ON, verify that the passenger heated seat operates properly.

• If the heated seat does not operate, refer to Front Heated Seat Malfunction (Front Heated Seat Malfunction).

2. Ignition OFF, disconnect the PPS module X1 harness connector.
3. Ignition ON, heated seat ON, verify that a test lamp illuminates between the passenger heated seat back low reference circuit terminal 10 and ground.

• If the test lamp does not illuminate, test the low reference circuit for a short to ground, open/high resistance.

4. If all the circuits test normal, replace the PPS.

Repair Instructions

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

* SIR/SRS Wiring Repairs (Component Tests and General Diagnostics)
* Control Module References (Programming and Relearning) for PPS replacement, setup, and programming