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You are a star gsr600. Went to the car armed with screwdriver and gently levered out the whole unit. Guess what? Nothing attached to the back. I peered down the hole and there was the wire which had obviously come off. Retrieved the wire, plugged it back, returned unit to car and eureka!! My mobile phone charger now works. Thank you so much, it has been irritating me for a while now but I did not know you could pull it out until you told me (PS to the others kind enough to reply to me, on my car, this does only work when the ignition is turned on, but that is all I want it to do)