GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 DTC 🢒 DTC 1058-1062

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 and overview of each diagnostic category.

DTC Descriptors

DTC 1058: PPS Communication Fault

DTC 1059: PPS Communication Fault

DTC 1060: PPS Communication Fault

DTC 1061: PPS Communication Fault

DTC 1062: PPS Communication Fault

Circuit/System Description

The passenger presence system (PPS) is used to monitor the pressure profile of any occupant that is sitting in the front outboard passenger seat and communicates the profile classification to the sensing and diagnostic module (SDM). The SDM will either enable or suppress the deployment of the instrument panel (I/P) module based on the profile classification of the occupant. If the PPS detects that a malfunction with the communication circuit then the PPS will then set a DTC within the PPS. The SDM will then set DTC B0081 indicating a problem within the PPS and will suppress the deployment of the instrument panel (I/P) module and then 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 has never established or lost communications with the SDM.

Action Taken When the DTC Sets
    • The PPS will set a DTC, and then communicate with the SDM via non GMLAN circuit.
    • The SDM will set DTC B0081.
    • The SDM disables the I/P module deployment loop.
    • The PPS will turn ON the passenger air bag status OFF indicator.
    • The SDM commands the AIR BAG indicator ON via serial data communications.

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 255 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

Electrical Information Reference

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

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 component/connector.

   • The PPS module
   • The SDM module
   • The PPS wiring harness connector
   • The SDM wiring harness connector

  1. With the ignition OFF, disconnect the PPS module connector.
  2. Remove the SDM connector and inspect the SDM connector.
  3. Test the PPS communication circuit between the SDM and the PPS for a short to voltage, an open, or high resistance. Verify no high resistance, an open, or short to voltage exist.
    4. ⇒If any of the above conditions are found make the appropriate repair.
  4. If all circuits test normal then replace the SDM.
  5. Verify DTC 1058-1062 is not set.
    6. ⇒If DTC is set, replace the PPS module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  SIR/SRS Wiring Repairs
    •  Control Module References for PPS module replacement, setup, and programming