thanks insider , the speaker on the back doesnt kick in either , the module had been changed when i bought the car common fault lol, i was told that the reverse switch that makes the lights turn on has a different curcuit to the sensors dont know how correct this is,,anyway will check out what you said but still a bloody headache to say the least.it just stopped working one morning on the rear but not sure why as i havent done anything to the car for it to have stopped like this , all i have checked is the sensors changed the front to the back as the front ones work and all sensors pick up objects so not sure where to go from here really thanks smoggy