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 B0934:  Compass Sensor Circuit High

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Ignition 1 Voltage Circuit

--

B0935

--

B0931

Compass Sensor Feed

B0933

B0935

B0934

B0931

Compass Sensor Return

B0933

B0935

B0934

B0931

Compass Ground Circuit

--

B0935

--

B0931

Circuit Description

The internal fault detection of the electronic compass module is handled by the instrument panel cluster (IPC). The compass information is sent to the IPC via 2 discreet wire inputs from the electronic compass module. The IPC displays compass information in the driver information center (DIC).

Conditions for Running the DTC

The instrument panel cluster (IPC) monitors the analog input value once every ignition cycle at power up.

Conditions for Setting the DTC

The IPC detects that either compass input circuit(s) is shorted to battery.

Action Taken When the DTC Sets

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

Conditions for Clearing the DTC

    • The DTC will become history when a power cycle has been performed and the fault is not detected by the IPC.
    • A history DTC will clear after 100 fault-free ignition cycles.

Reference Information

Schematic Reference

    •  Driver Information System Schematics
    •  Instrument Cluster Schematics

Connector End View Reference

Displays and Gages 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

    •  Scan Tool Data List
    •  Scan Tool Data Definitions

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the electronic compass module.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal 14 and ground.
  3. If greater than the specified value, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify that a test lamp does not illuminate when connected between the compass sensor feed terminal 12 and the ground circuit terminal 14.
  5. If the test lamp illuminates, test the compass sensor feed terminal 12 for a short to voltage.
  6. Ignition ON, verify that a test lamp does not illuminate when connected between the compass sensor return terminal 11 and the ground circuit terminal 14.
  7. If the test lamp illuminates, test the compass sensor return terminal 11 for a short to voltage.
  8. If all circuits test normal, test or replace the electronic compass module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Electronic Compass Calibration
    •  Control Module References for the electronic compass module replacement, setup and programming