Mine has been temperamental recently but only when going down, going up is fine. Thought it was the usual microswitch which went in the past on my old Z3. Cut it off and joined the wires but still had the problem. Everything else is fine so I disconnected the connector at the bottom of the microswitch wiring and put a jumper across the connector and plugged it back together. All working fine now so looks like I have a break in the wiring between the connector and microswitch. I bought some new microswitches anyway because the old one is now unusable because of where I cut the wires and some length of cable to replace the old broken one. Just got to do it now as I'm running it still with the connector jumper.Package from Martin @ZEDonist UK arrived today. Hopefully fix my temperamental power roof. It goes up ok so assume it’s not the brake pedal switch..fluids etc are ok in the motor..gotta be the switch, the wires or a relay ?
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I'll guess yours is the microswitch, if not a break in the cable so this kit should fix it