Antenna System Test

WARNING: This page is about a different car, the 2007 Chevrolet Monte Carlo and 2007 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The length of the antenna coax cable lead-in and antenna body determines the total system ground measurement.

IMPORTANT: Always zero out the DMM before taking a resistance measurement in order to ensure an accurate reading.

Disconnect the antenna lead-in connector from the radio receiver.
Measure the resistance from the negative battery post to the coax outer conductor connector.
The resistance measured should be as follows:
- Cable less than 5 ft-No more than 0.035 ohm
- Cable 5-13 ft-No more than 0.06 ohm
- Cable 13-20 ft-No more than 0.085 ohm
Test the following when the resistance is greater than specified:
- 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 .
- Do not use black (phosphate-coated) hardware for antenna mounting purposes. This type of fastener is unreliable in making good connections.
After finding and correcting the condition, operate the system in order to verify the repair.

Perform the Antenna Checking Procedures after confirming the integrity of the antenna ground.