STEP 1. Check the state of the fin antenna.
STEP 2. Check to see if inspections are taking place is an area exposed to special electric fields.
STEP 3. Move the vehicle and check the radio.
STEP 4. Check if there is any damage to the fin antenna and antenna feeder.
STEP 5. Check the connection of the antenna feeder’s plug and multivision display.
STEP 6. Check of short circuit and open circuit in ANT+ line between multivision display connector and antenna amplifier connector.
STEP 7. Substitute a known good multivision display, and check the trouble symptom.