are the lights On?
you do know your car has a dimmer swtich, for the dashboard guage lights....
if you turn it all the way to bright, then turn it just a little bit more - the lights 'click' on - that'* the interior light on/off switch - so you can turn on the all the interior lights, without opening the door... .
either you didn't know about that on/off swtich, and it'* stuck on -
or one of your door switches is junk..