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 111 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESRADIO POOR RECEPTIONANTENNA CHECKING PROCEDURESANTENNA COAXIAL CABLE TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Antenna Coaxial Cable Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Antenna Coaxial Cable Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the antenna coax cable connector from the radio receiver and perform the following measurements.
IMPORTANT:
Always zero out the DMM before taking a resistance measurement in order to ensure an accurate reading.
- Measure the total resistance from end to end of center conductor of the coax cable:
- RG-58/RG-59 type cable-Less than 0.20 ohms
- RG-62/RG-62M type cable-Less than 3.5 ohms
- When checking the resistance, cautiously wiggle the lead-in tip and cable. Refer to Testing for Intermittent Conditions and Poor Connections .
- Test for continuity between the center conductor of the coax cable (radio end) to the center connector of the antenna attachment point.
- If there is no continuity between the center conductor of the coax cable (radio end) to the center connector of the antenna attachment point, replace the antenna base.
- Measure the resistance from the cable center conductor to metal case. Reading should be infinite.
- If equipped with a powered antenna, test for an open or short to ground on the radio on signal circuit.
- Replace the antenna and/or lead-in cable when the above readings are not obtained.
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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.