My central locking was "bouncing" being that it when u tried to lock it, it popped straight back up again and took 2+ attempts to get it to stay locked....
the same applied with unlocking.
it was driving me up the wall.
so i had the mechanic who has always looked after my cars have a look at it for me... he has never worked on an M5 before but hes a good lad so i dropped the car in.
well we went through everything.he was physically shocked at the amount of wiring on this car..honestly i've never seen anything like it.
we came to the conclusion that the problem was with the drivers door lock...so we stripped the door and replaced the switch....that didn't help...so we tried a new actuator...that didn't help... in the end after 2 weeks he turned round to me and said that in all honesty he couldnt work out what the hell was going on and that it would save me money to take it to a BMW specialist. (i appreciate his honesty)
so on the reccommend of a m8 up the road who also owns a 1990 3.6 M5 , i popped it into B M Tec in Manchester.
when I took it in he immediately suggested the problem was with the wiring around the hinge in the boot that becomes fraid.However when I picked her up in the evening..he said all it was , was a fuse which was the first thing he tried.
ALL THAT HASSLE OVER A FUSE!! I was astonished....
I think the lesson learnt is stick to the specialists..they know their stuff