BMW Z4 E85 roof will not move
Why does the Z4 power roof neither go up nor down?
The most common cause is the roof motor or the hydraulic pump, which is a typical fault in early Z4 models. Water gets into the motor through the drain channels and rust eats it over time. The motor has failed in updated models too.
Why does the Z4 roof not lower completely and the red light flashes?
The fabric may not fold tightly into place and presses on the boot microswitch, which cuts off the lowering. The roof may still rise normally. Also check that the microswitch is not loose and that the boot shelf mechanism is not blocking operation.
How do you get a stuck roof moving by hand?
The hydraulic pump's bypass valve often sticks, and it can be freed by pressing the pin on the side of the pump. The bypass cable is adjusted from the adjuster in the middle of the housing. The roof should not be operated by hand repeatedly, since that strains the mechanism further.