interior fan inoperable On 4

Hi can anyone shed any light as I have the above 03 td4 with the interior fan inoperable On speed 4 . Looking on a diagram it is feed fuse 8 in the battery fuse box to a relay which in a Haynes manual is shown as 155 or I'm lead to believe it's a relay on its own. There 2 relays beside the interior fuse box with no identification.
First landrover I've owned but I think all the repairs I'm doing are going to be like a very long journey thanks

The high speed relay is actually located in the centre console down behind the ashtray. Its a pain to get to unless you take the console out. If you know where it is, its just about possible to get hand to it through the left hand footwell, but unlikely you will maage if you havent seen it before.

cheers for that Dave21478 I found it but thanks Sal fixed now so on to the next fault.