BMW 1 Series Reference Manual page 64

The hydraulic pump is only operational while the convertible top is in motion. Should the
pump fail, emergency operation will be necessary.
The hydraulic control unit is installed in the right side of the luggage compartment. It has
been placed in the furthest point possible from the driver in order to minimize the sound
being transmitted into the passenger compartment by the pump during operation.
Index Explanation Index Explanation
1 2
Trunk side member Hydraulic control unit
36
E88 Complete Vehicle