The door switch is on the drivers side arm rest. it is the upper one. If you are talking about the one to lock yours kids in the back it is on the door end with a little lever.
There is a lever to put it into 3 modes off, always on, only on with door open. If none work then replace the bulb. The bulb is a de3175. Just get a screwdriver and pry off the plastic cover.
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