Hi all, Last year I had experienced the autobox refusing to come out of 'Park' and I ended up handing over my baby to the MERCDADS, the totally incompetent Mercedes Stratford London. They had it 2 days, 'told' me that they had replaced the ENTIRE lever mechanism, and returned it to me, at collection I tested it and it was the SAME. I was told the all mechanism had been replaced, they scratched the wooden dash, broken the wiring for the tv system, and broken the cup holders, to which they rammed a 'screw' into the rear to 'jam' the cup holders into closed position...SENIOR TECHNICIANS THESE, that were let loose on my baby
.... and you wonder why I hate them so much eh?!
Anyway..sorry got a little side tracked there....
After experiencing the same problem SURPRISE SURPRISE, immediately, after, of the gearbox refusing to release out of park, which is usually associated with a 'Click' (the activation of the 'Solenoid') when the ignition/engine is on and the brake pedal is pressed. When there is no 'click' then the lever refuses to move out of 'Park'.
I decided to have a look into this myself.
There is a little 'Microswitch' which is located in the top left hand corner (see pics). This is switched by the positioning of the cam which obviously turns dependant on where the 'Lever' is positioned from 'P' down to '1'.
What I have found is that the microswitch has a little arm on it and this sits on top of the 'cam', which has a little raised 'lip' on it. When the cam rotates into the park position, the raised lip hits the lever on the microswitch thereby activating the switch, which in turn activates the 'Solenoid'.
Now when this switch has either dislodged itself, (this is easily done due to the crap design of the mountings, this has no clips or screws, but simply slots inbetween two little pieces of flimbsy plastic) or it has become oxidised it simply doesn't 'make' therefore the result is that the 'click' doesnt take place and the lever is not released by the 'Soleniod'
(the click is caused by the operation of the soleniod)
To fix this:
1, Check that the switch is fitted in the correct position and not become dislodged
2, Check the 2 wires to the switch haven't broken off
3, Manually operate the little lever on the switch.
4, If this doesnt work then you can just 'short' the two wires to cause the solenoid to operate, if this causes the soleniod to click (don't forget to have ignition on and foot brake pressed) then this switch will need to be replaced, this is a generic part so go down to your local electronics parts shop and buy it for a few pence as opposed to getting ripped off by the Mercdad stealership, whom no doubt, will be rubbing thier thieving hands with glee.
I hope this helps you.