Question about BMW Z4
Posted by Anonymous on
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Posted on Jan 02, 2017
get a dealer to look at it. The mechanism is fairly complex and the motor is very expensive. I you bust either the frame or the motor it'll really cost to fix. It may be freed up at much lesser cost.
Hate to tell you to get other help but thats my best advice.
Posted on Jan 20, 2009
I have this same vehicle and have had some problems with my top as well. Apparently, it is pretty common as I was recently talking to a shop owner with the same model and I were comparing notes. First thing to check is that the two "nobs" in the trunk are not rotated. The two nobs I am referring to are located on the top of the trunk when opened and when moved, either drop or lower the compartment into which the convertible top drops into when lowered. If these nobs are not turned so that the compartment is available, the top will not work. I have always wondered why they even installed those, but I was told it was so that we could have that extra 3" of storage space if absolutely needed. If the nobs are in the right position and your top is still not working, you can manually drop or bring up the top by turning the red handle (also located in the trunk near the convertible top storage) so that it is no longer flush, but turned so that you can see the 'O' shape. This has been my only option when my top started acting up in the middle of a Florida thunderstorm. Fantastic timing these things have. I hope this was helpful. If you are like most others who own the z4, or any bmw (or even a vw), you know that the mechanics (engine, etc.) are great in the fact that they rarely, if ever, cause any issues, but silly things like the stupid cup holders (don't get me started) and eventually bigger, but still aesthetic, items liek the top are the first to go. Would still never trade the z4 for a sedan.
Posted on Jun 07, 2009
SOURCE: convert top stopped working
I had this problem not long ago. In the trunk on the right side (facing the trunk) there is a manual switch for the top. My son changed my tailights and accidentally switched it to manual. I switched it back to automatic and have not had probs since.
Posted on Jul 14, 2009
SOURCE: convertible top won't open
If its yellow, thats a good thing. Check in the trunk that the two knobs that hold the top when retracted are in the down position. Top should drop like it always has. LOVE MY Z4!
Posted on Jul 24, 2009
SOURCE: Convertible top will not go down
Sorry, but there's no easy fix for this.
From experience I'm confident that one of the microswitches or relays which control the roof folding sequence has failed. If you're really unlucky then it's the electric motor (rare) or one of the parts attached to the motor assembly (not so rare). Microswitches and solenoids are relatively cheap, but it's a laborious process even for a pro to isolate which component has failed and often a real job to get to the offending part and replace it.
As a basic guide though, first check the fuse. If it's failed then DON'T just replace it without further investigation: fuses do not wear out, they fail because there's a fault somewhere which has caused too much current to pass through and the fuse is sacrificed to prevent fire or other serious damage. A simple tip is to listen to the solenoid for a click when activated. If there is none then check to confirm power is reaching the solenoid; if there is then give it a sharp tap when operating the roof. This sometimes causes a dodgy solenoid to operate but it will still need to be replaced. If the solenoid appears to be OK then you'll need to trace and isolate each component in the circuit to test them individually. If they all check out OK then you'll need to carefully check they wiring loom, especially where it passes through bodywork.
To do all of this you'll need time, patience, some basic automotive electrical tools and it's vital that you obtain both a circuit diagram and a physical wiring schematic (the first shows how the circuit works, the second shows how it relates to the actual wiring). A Haynes manual is usually essential for this and will pay for itself with the first repair you use it for.
Although this kind of job may seem daunting you can usually narrow down where the fault may lie or even identify what's wrong which will save a lot of labour costs if you choose to get the repair done professionally.
Good luck, and fingers crossed for a fast and obvious fault-finding.
Posted on Sep 16, 2009
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