The convertible will not latch, while the two rear windows down.

What make ,model an year vehicle ? Could be a sensor or a control module . Some of these convertibles are very complex , could set DTC'S diagnostic trouble codes .
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The hydraulic lines and the cylinders

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GMLAN communication to the Body Control Module (BCM)

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Open/Close request circuit to the driver and passenger window motors

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Power and Grounds

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Folding Top Main Power Fuse 30A

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Folding Top Logic Power Fuse 20A

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Ground G301 for the FTC module and G305

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Folding Top Open/Close Switch (S15 and S16)

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Rear Compartment Limit Switches

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Rear Compartment Lid Release Switch (S3 and S4)

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Rear Compartment Lid Release Switch-Front Hinge-Left (S11 and S12)

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Rear Compartment Lid Release Switch-Front Hinge-Right (S9 and S10)

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Folding Top Front Location Pin Guide-Left (S17 and S18)

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Rear Compartment Lid Release Switch-Left (S19A)

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Rear Compartment Lid Release Switch-Right (S19B)

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Rear Compartment Partition Position Switch (S20)

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Folding Top Front Location Pin Position Switch (S13)

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Folding Top Front Latch Actuator Position Switch (S14)

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Hall Effect Sensors

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Folding Top Header Latch Cylinder Sensor (S1)

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Rear Compartment Cylinder Extended Sensor (S2)

DTC B367F 58: Roof Stowed Ready to Latch Sensor Circuit incorrect reaction after event

DTC B367F 59: Roof Stowed Ready to Latch Sensor Circuit circuit/component protection time out
DTC B367B 58: Deck Lid Anti-Rotation Latched Sensor Circuit incorrect reaction after event

DTC B367B 59: Deck Lid Anti-Rotation Latched Sensor Circuit circuit/component protection time out
Your best bet is probably to take your vehicle to a qualified repair shop.

I believe you do this in this order. Roll windows down, release the latch at the top of the windshield, raise the front of the top, release rear cover by pulling the latch near the rear seat, Pull up the back of the top and then pull up on the rear cover. The back of the top should now fit into the opening under the rear cover. Continue to fold the top into this space. Push down on the rear cover to lock (won't be able to open trunk if not engaged.) To raise it, release rear latch cover, open rear cover and pull top out of opening. Raise rear of top so you are able to now close the rear cover, set rear of top down on cover and then pull fron of top down and engage the fraont latch. Hoe that helps.

Some things to try:

Raise and lower all windows through a cycle or two

Open and re-latch the Rear shelf latches

good luck

Hi I have the same problem on my 1999 Carrea, I had the windows at the rear stuck down and the roof latch keeps open and closing, I have not solved this yet it could be a relay but it all started when I was opening and closing on the keypad, if you get the roof up and cant get the rear windows to close get the roof closed to a locking position and where the hood lock pulls back at the roof lock station slide a thin s crew driver up the side of the lock hook they close then, also a tip, if you stick your little finger in the hole where the hood lock goes and press both the rear window buttons up they close when the roof is down. if anyone knows why my hood wont lock please let me know

I just went through HELL because my top would not go down! I did EVERY possible solution with NO AVAIL! So anyway, Im in the trunk and noticed a baggy sack hanging in the trunk.. So I figured it was for the roof.. Anyway the sack has 2 straps to hold it up for more room when the top is UP. So I said "I Wonder...." I released the straps and the bag hung again, and GUESS WHAT? Yea the roof works!!!!!!!!!!!!!

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.

There are numerous technical service bulletins issued for the top. The list with the full TSBs is here.

That is not the problem the problem is your convertable roof is not closing properly to test this let someone press down on the roof lid and then try to open the trunk, To fix this let the roof lid open and let the roof come up until the back part stands up to let the roof lid close so that the roof hold is exposed look on the right hand side of the car (if your standing at the back) under the roof lid catch there is a small plastic buttun that the roof lid catch needs to pres down on, this tells the car that the roof lid is seucre and it is now safe to let open the trunk, All you have to do is set the tension on the cable for that roof lid catch and the problem is sorted.

Beamerguy

I just bought a 1996 328iC (the "C" is for convertible). I bought the car with the knowledge that the roof needed a motor replacement (~$300 for the part alone + ~1-2 hours labor) and that I would need to open and close the roof manually if I wanted to take advantage of the convertible part of the car.

After some trial and error, I figured it out and now it takes me <30 seconds to open or close the top (manually). Note: my top is a semi-electric roof, which I think is what came on the 328iC, you have to lock into place after you close it.

Here's what you do:
1- open all of the windows
2- unlock the roof by turning the latch between the sun visors.
3- push the front of the roof towards the rear of the car - be sure to push in the middle of the roof, where the latch is.
4- lift the back of the roof up off of the roof storage compartment
5- while holding the back of the of the roof up, lift up the roof storage compartment door
6- let go of the back of the roof so that it drops right into the storage compartment
7- push the rest of the roof into the storage compartment
8- close the storage compartment door.

To close the roof, follow the steps above in reverse order. Remember: this is a German car, so you use a little bit (or a lot) of force and you won't hurt it (I think it actually likes it ;-D ).

Good Luck!!!

Roman

Make sure that the microswitches in the rear trunk are all depressed. There is one where the parcel shelf (the cover that covers the view of the trunk from the outside) sits on the left that is usually the problem make sure that it is sitting on the microswitch (pull down on the closest side to you so it pivots forward and sits on the microswitch. Then make sure that the latch on the left side (drivers side) of the rear that allows easier access to the trunk switches the microswitch there. now close the trunk and try the conv top. the parcel shelf, the rear access latch and i think the trunk switches need to be depressed for the top to work. I know at least the first two.