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Search the BMW forums like Pelican Parts or DTM Power or United Bimmer Community. When I read of problems with convertible trunk lids, a common suspect is a failure in the system that won't allow the trunk to open when the roof is down.
Hi, I don`t know the car but sometimes when you can`t open a boot lid someone need to push the boot lid down ( this relase the pressure of the latch system)and the same time someone pull the handle. Hope that helps.
1st Scenario The noise you are decribing can be from the driving gear from one of the electric motors could be worn down in which case you will have to get it replaced the best place to get a cheap second hand one is at a scrap yard.
2nd Scenario If the trunk still wont open then the loose cable you are describing has snapped you will know witch cable because if the roof lid is open check for a button on one of the right lid catch which tells the car the roof lid is now closed and secure so the trunk is now allowd to open. If this is the case replace the cable.
To alastair bda if this does not solve your problem I have sent you an e-mail with further questions to investigate your noise problem. I will be waiting on your reply.
First of all the roof is not even soppose to operate while the trunk is open - So there is the first problem Ive been involved with BMW's for a long time and this is the first Ive heard of a roof opening while the trunk is open. There is a built in feature that tells the car not to open the roof if the trunk is open and the other way roung while the roog lid is open the trunk cant open.
The reason the roof is not working anymore as soon as there is stress on the roof the electric motors(One operates the roof and the other operates the roof lid) disengages, You said that the roof still worked but the lid did not so probably only the one motor disengaged. So what you have to do is open the trunk on the left hand side right behind the tail light pull away the material and simply just push the electric motor into place. that should fix your problem.
It may happen that the two motors have become out of sync, Disengage both electric motors manualy put the roof away engage the motors and that should put the roof and lid back into sync.
The Roof Mechanism works with two motors similiar to the ones that wund the windows. Now the two mechanism are located in the left side of the trunk.
The trunk wont open Because of the roof lid that is not closed properly. How you can test this is to press down on the right sid of the roof lid and then try to opne the trunk.
Now the reason that this is happening is that the roof lid is not closing properly nad pressing on a small orange buttin located just below the right hand side roof lid catch. How you are going to remedy this problem is to adjust the cable tension to close more securely.
Now the two motors in the trunk that works the convertable roof can be engaged and disengaged on motor works the roof lid and the other one the roof.
You need to get these motors in sync so that they open and close the roof in the correct order.
The problem is that your roof(SOFT TOP) lid isnt closing properly. If you open the roof lid you see there is a button on one of the latches that tells the car that the roof is securely closed if your roof lid is not secure the trunk wont open. To test this press down on the roof lid and the try to open the trunk.
i believe that your trunk is unlocked and to prevent damage the system locks it self, check the trunk.
lock it with your key then try it out.
that happened on a audi cabriolet and we locked up the trunk and problem solved. let me know if that helps, if not i will try something else