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.

DTC Descriptor

DTC B0935: Compass Sensor Circuit Open

Circuit Description

The internal fault detection of the compass is handled by the instrument panel cluster (IPC).

Conditions for Running the DTC

The IPC monitors the analog input value at power up.

Conditions for Setting the DTC

The IPC does not detect the compass sensor. This may be due to an open circuit.

Action Taken When the DTC Sets

The DTC will be set and stored in non-volatile memory.

Conditions for Clearing the DTC

    • The DTC becomes history when the driver information center (DIC) no longer detects a failure.
    • The history DTC clears after 100 fault-free ignition cycles.

Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Driver Information Center (DIC) 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 with a scan tool that the DTC is a history DTC.

If not a history DTC, test or replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC replacement, setup, and programming