IIRC there was a thread on this and this was the answer! Blue interior lighting was a factory option, and I believe this is the switch for it!
WTF! Why would something like that be an option? Seems a bit odd, why would anyone want blue interior lighting?
Im not sure mate, maybe it was to go with the blue interior.....
There used to be a site with all the S15 options, think its gone now though
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