1.At first take out the foglight's fuse before you battery is dead. (Fog lights stays "ON" even you leave the car).
2.You must replace the Multifunction control switch =(
Here is the photo of problem:
http://www.ptcruiser.fi/ptgalleria/albums/userpics/10010/normal_sumuvalokytkin.jpg
Fog lights are connected to pin 13,14.
Fog light switch is "B". Because the current is many Amps, contact surfaces are heating up.
After that the contact opening "C" is melting (made of plastic) so the fog light stays "ON".
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