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2004 C4S Cab - Top won't go up

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My top won't go up on my 2004 C4S Cab, after the point of the slide back of the rear dome part. It stops at this point and I hear a clicking noise (1 time).

It will go back down from this point normally. I've tried to turn the car off, turn it on, and have made sure the parking brake is engaged.

A few months ago I had the same issue and the tech said they just 'reset' the top. I called back but now they don't remember what he meant...

Can anyone think what he means by this or has other guidance?


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Welcome. It's best if you can access the fault codes. There are many micro switches and potentiometers the could be at fault. It sounds like a timing fault meaning that a sequence of events are not in sync so the opening procedure is stopped.

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Ask the tech to "recalibrate" the top. It's a diagnostic sequence that determines the range of motion and position of each sensor/switch and resets them to work in the correct order.

Are the little wing flaps moving? They have to change position before the lid can close. One of them might be freezing on its worm drive, which then stops the rear deck.

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