Trouble1: No exterior image is displayed.
Cause1-1: The exterior image camera may be faulty.
Cause1-2: There may be a faulty connection or disconnection inside the instrument.
Trouble2: The exterior image is becoming brownish.
Cause2: The lens of the exterior image camera has deteriorated.
Trouble3: The displayed exterior image is partly cropped.
Cause3: The field of vision of the exterior camera is not set correctly.