Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2413 (INSTRUMENT PANEL SYSTEM DISPLAYS AND GAUGES)DIAGNOSTIC INFORMATION AND PROCEDURESCOMPASS MALFUNCTIONCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
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Compass Display Is Incorrect
- Adjust or change the compass zone using the world magnetic variation map. Refer to Compass Calibration and Magnetic Variance (without OnStar Only)Β .
- If the compass is still incorrect, perform the compass magnetic variation adjustment procedure. Refer to Compass Calibration and Magnetic Variance (without OnStar Only)Β .
- If the compass is still incorrect, replace the compass module.
Compass Displays CAL
- Perform the compass magnetic variation adjustment procedure. Refer to Compass Calibration and Magnetic Variance (without OnStar Only)Β .
- If the compass still displays CAL, replace the compass module.
Compass Displays No Heading
- Ignition OFF, disconnect the harness connector at the compass module.
- Test for less than 5 Ξ© between the low reference circuit terminal 2 and ground.
- If greater than the specified range, test the circuit for a short to voltage or an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the voltage circuit terminal 1 and ground.
- If the test lamp does not illuminate, repair the circuit for a short to ground or an open/high resistance.
- Ignition OFF, test for greater than 1 Ξ© between the compass LIN 3 data circuit terminal 3 and ground.
- If less than the specified range, test the LIN 3 data circuit for a short to ground.
- Ignition ON, verify that a test lamp does not illuminate between the compass LIN 3 data circuit terminal 3 and ground
- If the test lamp illuminates, test the LIN 3 data circuit for a short to voltage.
- Ignition OFF, disconnect the X4 harness connector at the BCM.
- Test for less than 1 Ξ© between the compass LIN 3 data circuit terminal 3 to the BCM terminal 6.
- If greater than the specified range, repair the LIN 3 data circuit for an open/high resistance.
- If all circuits test normal, replace the compass module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.