k12 54 reg stereo turns itself on

As title really - when driving along with the stereo off - it will come on. A bit vague as to what prompts this - as it is my daughters car. It did it to me today when I turned the sidelights on. Having said that - when I tried to replicate this - it would not do it . Typical !! Is this a known issue and would it ever come on overnight and drain the battery?. Thanks
 
Is it a stock radio? If so it should be wired to only come on if the ignition is on - in which case, no risk of it coming on at night. Unless the car's being driving at night of course....

As to what's causing it, I would go with a faulty switch - perhaps the button is so worn that every now and again it makes a connection and turns on. The head unit may be connected to the headlights, but usually only so that the display dims when you put your lights on.
 
Thanks for your suggestions - it is standard radio/cd but only covered 25k Miles. Turning sidelights on definitly triggered it tonight.
 
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