Circuit/System Testing (With Antenna Mast)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Perform the Audio System Troubleshooting Hints to properly identify the customers concern before using this diagnostic.
- With the ignition OFF, disconnect the antenna cable from the radio. With a DMM, verify there is less than 0.20 ohms between the negative battery cable and the coaxial cable metal outer shield.
- If greater than 0.20 ohms, test the antenna mast base for proper ground to the body. If antenna is properly grounded replace the antenna coax cable.
- Disconnect the coax cable from the antenna mast. With a DMM, verify there is less than 3.5 ohms between the radio end coaxial cable conductor and the antenna end coaxial cable conductor.
- If greater than 3.5 ohms, replace the coax cable.
- If no problems are found with the coax cable or the grounding of the antenna mast replace the radio.