All have stopped functioning, have checked fuses all ok, however have noticed that neon on rear window heater switch always on, even when switch in OFF position, is there a relay involved before power gets to heaters. Rear wiper relay can be heard to click ok and washer also ok but wiper not working. Any suggestions on how to check further, can read an electrical circuit drawing but any ideas where I can get a copy. Thanks , any help much appreciated.