GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 HHR 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC 4061-4065

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 4061: Loss Of Class 2 Communication

DTC 4062: Loss Of Class 2 Communication

DTC 4063: Loss Of Class 2 Communication

DTC 4064: Loss Of Class 2 Communication

DTC 4065: Loss Of Class 2 Communication

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 a malfunction with the communication circuit then the PPS will set a DTC within the PPS. 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 illuminate the AIR BAG indicator.

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.
    • The SDM will set DTC B0081.
    • The SDM will disable 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 for setting the DTC no longer exists.
    • A history DTC will clear once 100 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

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

Scan Tool Reference

Control Module References for Scan Tool Information

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.

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

  1. Ignition OFF, disconnect the harness connector at the PPS and the SDM.
  2. Test for less than 1 volt between the occupant sensor serial data circuit terminal 60 and ground.
    3. ⇒If greater than the specified range, test the circuit for a short to voltage.
  3. Test for infinite resistance between the occupant sensor serial data circuit terminal 60 and ground.
    4. ⇒If less than the specified value, test the circuit for a short to ground.
  4. Test for less than 1 ohm of resistance between the SDM occupant sensor serial data circuit terminal 60 and the PPS occupant sensor serial data circuit terminal 18.
    5. ⇒If greater than the specified range, test the circuit for an open/high resistance.
  5. If all circuits test normal, replace the SDM
  6. Verify DTC 4061-4065 is not set.
    7. ⇒If DTC is set, replace the PPS module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PPS or SDM for replacement, setup, and programming