I think the switch is part of the latch mechanism.

Open the trunk, and look at the sill where the latching pin mates to latch the trunk.

Now - on the inside of that sill, facing the front of the car, you should find a little yellow lever. It rotates upward to turn off the trunk lights. Doing so also causes the lid handle to retract and the pull down to withdraw.

Hope this answers your question.