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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Radio Poor Reception >> Circuit/System Testing (With Side Rear Glass Antenna Grid)
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Circuit/System Testing (With Side Rear Glass Antenna Grid)

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.
  1. 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.
    • Inspect the antenna module ground and bracket for a proper connection. If greater than 0.20 ohms, test the antenna module ground for an open or short to power. If antenna module and bracket is properly grounded replace the antenna coax cable.
  2. Disconnect the coax cable from the antenna module bracket. With a DMM, verify there is less than 3.5 ohms between the radio end coaxial cable conductor and the antenna module end coaxial cable conductor.
    • If greater than 3.5 ohms, replace the coax cable.
  3. Disconnect the antenna module harness connector. Turn ON the ignition and the radio. With a DMM verify the remote enable signal circuit receives B+.
    • If B+ is not present on the remote enable circuit with the ignition and radio ON, test or repair open or short to ground on the remote enable circuit. If open or short to ground can not be found, replace the radio.
  4. Reconnect the coax cable to the radio and the antenna module. Reconnect the antenna module harness connector. Turn ON the ignition and radio. With the scan tool observe and record the signal strength dBuV in the radio data list. Disconnect the coax cable from the radio antenna module bracket and observe the dBuV for a drop in signal strength.
    • If the dBuV displayed on the scan tool did not drop signal strength with the antenna module unplugged, replace the antenna module.
  5. Test for continuity of the individual lines of the antenna grid. Inspect for a improper button connection at the antenna connector (side rear glass). With a DMM, verify every antenna grid line has continuity end to end.
    • If there is no continuity one or more of the antenna grid lines replace the side rear glass.
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