If you are coming from outside Granada, exit the Granada ringroad at exit 128 (Méndez Núñez).
Don't take any other exit or you will get hopelessly lost.
Go straight on up into Granada. You will pass the Hipercor supermarket on your left and the Corte Inglés on your right.
Keep going straight up. You will cross two big roads (Arabial and Camino de Ronda). Keep going.
About 300 metres after the Hotel Center on the right you have to turn right into the Severo Ochoa Parking.
It is easy to miss the turn-off to the carpark (and if you miss the turn-off it is difficult to get back) but it is just after a newspaper kiosk on the right. There is a sign saying P Abierto at the start of the road. After turning right the parking is about 60 metres up a short road.