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 1304 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1259CIRCUIT/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 STS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
- Ensure the vehicle is outside in an area with an unobstructed view of the southern sky. Turn XM radio ON. Tune the radio to satellite channel 1. XM reception should be clear.
- Contact XM radio services at 1-800-852-9696 to verify the customers account status or possible network problems.
- Ignition OFF, disconnect the antenna coax from the DRR. Connect the EL-48028 to the DRR.
- Ignition ON, radio tuned to XM, verify XM reception has improved.
- If the XM reception has not improved, replace the DRR.
- Ignition OFF, disconnect the antenna coaxial cable from the DRR antenna base.
- Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.
- If greater than the specified range, replace the antenna coax.
- Test for infinite resistance between the antenna coax center terminal and ground.
- If less than the specified value, replace the antenna coax.
- Test for less than 5 ohms of resistance between the two ends of the coax cable center conductor.
- If greater than the specified range, replace the antenna coax cable.
- Test for less than 5 ohms of resistance between the two ends of the coax cable outer shield.
- If greater than the specified range, replace the antenna coax able.
- Test for infinite resistance between the antenna coax center conductor and the outer shield.
- If less than the specified range, replace the antenna coax cable.
- If all circuits test normal, replace the digital radio antenna.
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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.