GM Service Manual Online
For 1990-2009 cars only

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 an overview of each diagnostic category.

Circuit/System Description

The IPC calculates the mileage based on the serial data vehicle speed information from the ECM/PCM. The IPC receives the vehicle odometer information from the body control module (BCM) via the serial data circuit. The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested through the DIC Vehicle Information Menu.

Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster 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 Verification

Ignition ON, verify the odometer trip reset switch toggles between season and trip odometer when the switch is pressed.

If the odometer trip reset switch does not toggle between season and trip odometer, replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for the IPC replacement, setup and programming