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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1408 (Entertainment System) >> Diagnostic Information and Procedures >> Radio Poor Reception >> Antenna Ground Test

Antenna Ground Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Always zero out the DMM before taking a resistance measurement in order to ensure an accurate reading.
  1. Disconnect the negative battery cable.
  2. Disconnect the antenna lead-in connector from the radio receiver.
  3. Measure the resistance from the negative battery cable to the coaxial cable, outer conductor, connector.
  4. The resistance measured should be 0.20 ohms or less.
  5. Test the following when the resistance is greater than 0.20 ohms.
    • Base of the antenna for a poor connection to body ground.
    • The coaxial cable interconnects for a poor connection or corrosion.
    • Test for an open or high resistance from the battery negative cable to the body. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
  6. After finding and correcting the condition, operate the system in order to verify the repair.
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