Yes, a bad ignition switch will do all sorts of weird things to your car. I had a 98 that the CC wasn't working at all on until I changed out the switch.
Items I've personally encountered (on 2 Boxsters) that were remedied by R/R the ignition switch.
1. Interior dome light would not go out.
2. AC fan would not work, but restarting the car would make it work.
3. Radio cutting out and resetting
4. Radio would not turn off when key was removed
4. Cruise not working
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