Hydraulic Unit
WARNING: This page is about a different car, the 2003 BMW Z8, 2002 BMW Z8, 2001 BMW Z8, and 2000 BMW Z8. However, it is still accessible from the selected car via links, so may be relevant.
The hydraulic unit is a self contained unit with a sealed reservoir that is sleeved around the pump assembly. The end of the hydraulic unit contains a distribution block where the hydraulic lines are fitted. The hydraulic unit is located in the left rear fender well. The pump motor is controlled by the Convertible Top Module (CVM III). The CVM III reverses the polarity (through the relays) to reverse the pump motor operation. See Fig 1 .