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Trunk sensor on 2001 BMW 330Ci

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
where is the sensor in the trunk, theres only three wire going into the lock. Is it the bottom portion, or the top portion
(1) Answer
There is a micro-switch in the trunk latch that is used to determine if the trunk is open or not.