Probable cause of fault
- The main unit is not properly inserted in the radio compartment.
- The antenna cable is poorly connected into the radio compartment/main unit.
- Poor coaxial cable connection.
- The antenna amplifier's power supply (trigger voltage) or ground connection is faulty.
- Break in glass antenna (rear window) 4D, or rear side window 5D.
- Bad connection between the antenna amplifier and glass antenna.