Yes, RAVE is compulsory...and i doubt you'll find the brake lamps relay cos its small and soldered into the fusebox's PCB so you have to dismantle the fusebox and even then it has two PCBs face to face soldered to each other... i tried to find it myself without success... at the price of good used fuseboxes it doesnt worth the hassle... though when you have RAVE i'll give you some hints where to measure without opening th fusebox