AFT Rlease button - what does it do?

[Poohbear]

Can anyone tell me what physically happens when you press the AFT release button to allow you to operate the lower button to lower the AFT?

Sometimes it seems like there is a long delay and sometimes we even have to have a couple of goes because it doesn't seem to release and when you press the lower button nothing happens. We've never had it fail to lower but I am concerned that somthing isn't right and one day we may not be able to lower it.

I understand that there is some kind of physical lock that operates when the AFT reaches the top of its travel. Where is this physical lock and what tells the control system that it has operated so that it will allow the lower button to work?

Anyone?

[Northern Bongolow]

dont know about the physical lock but the control unit is mounted behind the rear drivers side panel near the tailgate. i gave one to geoff to pull apart, he said it was full of relays etc.

[Driver+Passengers]

I don't think their is anything "active" other than the two motors at the back for raising/lowering. There are microswitches front, middle and rear to tell the control unit (rear offside as Ady said) where it's at. There is no lock when fully up but will "lock" into place when fully down. This is not a separate lock I don't think - just the motors driving the sliders fully "home" so that air pressure will not lift the roof when on the motorway. The lock cancel button just tells the control unit to turn on the up/down button when the roof has been fully up. You wouldn't want to be sleeping upstairs and for someone to start lowering the roof. That's why you have to initiate it with a button press upstairs.