FM broadcasts are transmitted at high frequencies and do not bend to follow the earth's surface. Because of this, FM broadcasts generally begin to fade at short distances from the station. Also, FM signals are easily affected by buildings, mountains, or other obstructions. These can result in certain listening conditions which might lead you to believe a problem exists with your radio. The following conditions are normal and do not indicate radio trouble:
Kia Cee'd JD Owners Manual: The LDWS may not warn you even
if the vehicle leaves the lane, or
may warn you even if the vehicle
does not leave the lane when
The lane is not visible due to snow, rain,
stain, a puddle or many other things.
The brightness of the outside changes
suddenly.
Not turning on the headlight even at
night or in the tunnel.
Difficult to distinguish the color of the
lane from the road.
Driving on a steep grade ...
Kia Cee'd JD Service Manual: Troubleshooting
Troubleshooting
Symptom
Suspect area
Engine will not start or struggle to start
Vapor hose damaged or disconnected
Engine struggles to start
Malfunction of the Purge Control Solenoid Valve
...