Hi had same problem on my 95 m reg Best way to sort is to take to Land Rover dealer.Get them to do a diagnostics test. They did on mine 7 error codes came up. They reset them and the sensors, checked relay etc. Found it was faulty conection on relay. All this cost was £20.97 well worth it as sensors for rear at main dealer are £250 to £300. Hope this helps.
Andy
October 2006