Description of operation
WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
The fog light switch receives current (+54) on pin 5. When the switch button is pressed in, it closes between pins 5 and 7 and current is fed to pin 62 of DICE. Depending on the fog light program alternative, the main light program alternative, and the position of the dipswitch, DICE grounds pin 29 and the fog light relay operates. +30 voltage is then fed from fuse 5 to the fog lights, which go on.
The switch indicator lamp for the front fog lights is powered when inactive from pin 49 of the control module and lights up dimly. The lamp shines normally when the button is pressed.