Quote Originally Posted by Tip12345 View Post
The very top one in the middle . ? Have been mucking around and now have a light for the aux tank on and switch for the aux tank does not work . It's driving me mad.
The ECU relay is the top relay. If your vehicle is a wagon it will more then likely be on the LHS.

The middle relay is for the interior fan. Just swap these two relays over.

Disconnect your batteries for half an hour should reset the sub tank module.