There are four plastic retaining clips that hold the control module intact.

Starting with the smallest retaining clip, insert the flat end of a spudger in between the black and white plastic pieces of the clip in order to release its hold.

Rotate the control module to the next retaining clip, taking care not to accidentally clamp down the previously-released clip. Repeat the same procedure in the previous bullet to release the other two retaining clips.

Once all four clips are released, separate the white plastic piece from the rest of the control module.