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 G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 399 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESAUDIO/VIDEO DISC PLAYER ADAPTER - AUDIO OR VIDEO INOPERATIVE OR DEGRADED QUALITYCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Verify the DVD player in the radio is operating normally before performing this diagnostic procedure. If there is any problems with operating the DVD player with a known good DVD, replace the Navigation Radio.
- Ignition OFF, disconnect the X1 and X4(UX8 only) harness connectors at the Radio.
- Ignition ON, test for less then 1 volt between the appropriate signal circuit terminals listed below and ground.
- Left auxiliary audio signal (+) - terminal 1 X1
- Right auxiliary audio signal (+) - terminal 2 X1
- Drain wire (-) - terminal 7 X1
- Auxiliary video high signal (+) - terminal 9 (UY5) X1
- Drain wire (+) - terminal 8 (UY5) X1
- Auxiliary video high signal (+) - terminal 14 (UX8) X4
- Drain wire (+) - terminal 13 (UX8) X4
- If greater then specified range, test the circuit for a short to voltage.
- Test for infinite resistance between the terminals listed below and ground.
- Left auxiliary audio signal (+) - terminal 1 X1
- Right auxiliary audio signal (+) - terminal 2 X1
- Drain wire (-) - terminal 7 X1
- Auxiliary video high signal (+) - terminal 9 (UY5) X1
- Drain wire (+) - terminal 8 (UY5) X1
- Auxiliary video high signal (+) - terminal 14 (UX8) X4
- Drain wire (+) - terminal 13 (UX8) X4
- If less then the specified value, test the circuit for a short to ground.
- Test for less then 5 ohm between the terminals on the radio harness connector and the external terminals on the audio/video adaptor listed below:
- Left auxiliary audio signal (+) - terminal 1 X1 and the inside of the center (white) jack
- Right auxiliary audio signal (+) - terminal 2 X1 and the inside of the right (red) jack
- Drain wire (-) - terminal 7 X1 and the outside of both the center (white), and the right (red) jacks
- Auxiliary video high signal (+) - terminal 9 (UY5) X1 and the inside of the left (yellow) jack
- Drain wire (+) - terminal 8 (UY5) X1 and the outside of the left (yellow) jack
- Auxiliary video high signal (+) - terminal 14 (UX8) X4 and the inside of the left (yellow) jack
- Drain wire (+) - terminal 13 (UX8) X4 and the outside of the left (yellow) jack
- If greater then the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the adaptor.
- If all circuits test normal, replace the Radio.
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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.