WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
Insert a screwdriver into the hole stamped mark.
To remove upper module, lift it by pushing down the screwdriver's handle.
Fig 1: Inserting Screwdriver Into Hole Stamped Mark