The first things I would check is fuses #1 and #46. Make sure they are ok. Also make sure that the brake lights are working fine when pressing the pedal. On the z3 you Do have to press the brake pedal in order for the top to work. If all that checks out OK then i suggest testing the microswitch for the top positioning. You will need a multimeter, so if you dont have 1 maybe you can borrow 1.
Put the meter on the ohm setting for testing resistance. Remove the switch for the convertible top and disconnect it. At the connector that the switch plugs into put 1 lead of the meter to pin #2 and connect the other lead to body ground. With the top up and the latch released (basically in the position which you would normally press the button to lower the top) you should have continuity to ground. The meter should have a reading less than 1 ohm. If you have high resistance or an open circuit then that means that the microswitch is faulty and needs to be replaced. It comes with its own new harness. If the reading is within spec but the top still doesnt work, then the problem may lie in the relays or the switch or somewhere else. Do these checks that I recommended 1st and then let us know how it turns out. Microswitches are a common failure, if I had to guess that would be my guess. Good luck and happy testing,
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