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 1409 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1025-B1125CIRCUIT/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
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
- With the scan tool, verify the DTC is set by the amplifier.
- Ignition OFF, disconnect the suspect speaker. Test for 1-50 ohms across the speaker terminals.
- If not within the specified range replace the suspect speaker.
- Disconnect the suspect audio amplifier harness connector.
- Test for less than 1 volt on both of the suspect speaker output circuits.
- If greater than 1 volt repair short to voltage.
- Test for infinite resistance between both of the suspect speaker output circuits and ground.
- If resistance is less than specified value, repair short to ground.
- Test for less than 1 ohm between suspect speaker output circuits amplifier harness connector and the suspect speaker harness connector.
- If greater than specified value repair open or high resistance.
- If all circuits test normal, replace the amplifier.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.