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 1121 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSPEAKER 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
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Without Amplifier (UQ3)
- Ignition OFF, disconnect the harness connector at the appropriate speaker.
- Radio ON, test for 5.0-7.5 volts between the speaker circuit terminal A and ground.
- If greater than the specified range, test the speaker circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- Test for 5.0-7.5 volts between the speaker circuit terminal B and ground.
- If greater than the specified range, test the speaker circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less than the specified range, test the speaker circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- If the vehicle is equipped with UK6 Rear Seat Audio and the concern is with a rear speaker, Test the speaker circuits between the radio and the RSA control.
- If all circuits test normal, test or replace the speaker.
With Amplifier (UQA/UQS)
- Ignition OFF, disconnect the X1and X3 harness connectors at the amplifier.
- Radio ON, Rear Seat Audio OFF, test for 5.0-7.5 volts between the appropriate speaker circuit terminal listed below and ground.
With UQA
- Left front speaker control- Connector X2, terminal 4
- Left front speaker control- Connector X2, terminal 3
- Right front speaker control - Connector X2, terminal 2
- Right front speaker control - Connector X2, terminal 1
- Front center speaker control - Connector X2, terminal 13 (w/ Y91)
- Front center speaker control - Connector X2, terminal 1 2(w/ Y91)
- Left subwoofer speaker control- Connector X1, terminal 7
- Left subwoofer speaker control- Connector X1, terminal 3
- Right subwoofer speaker control- Connector X1, terminal 2
- Right subwoofer speaker control- Connector X1, terminal 6
With UQS
- Left front speaker control- Connector X2, terminal 4
- Left front speaker control- Connector X2, terminal 5
- Right front speaker control - Connector X2, terminal 7
- Right front speaker control - Connector X2, terminal 8
- Front center speaker control - Connector X2, terminal 13 (w/ Y91)
- Front center speaker control - Connector X2, terminal 1 2(w/ Y91)
- Left subwoofer speaker control- Connector X1, terminal 1
- Left subwoofer speaker control- Connector X1, terminal 2
- Right subwoofer speaker control- Connector X1, terminal 3
- Right subwoofer speaker control- Connector X1, terminal 7
- If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
- If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
- 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.