Over a year later, I hope you found your problems. The little that I've learned. Info on the A207 is slim to none, so I've learned from the C-Class. The hydraulic pump is located in the trunk, behind the drivers rear tire well. In the C-Class the pump has the hose plate mounted vertically (it's horizontal in my 2017 A207). The C-Class has a 40A fuse mounted basically on the wheel well. If it's blown, look to get the pump rebuilt as there is a problem. A new fuse will also blow. My car has no visible fuse near the pump. The green power wires run to the seat back, then across to the passenger side, where there is a control module. Still haven't located a fuse yet. If you have info, please add it as it will help others in the future.