Question about 2003 BMW Z4

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The convertable roof on my 2003 Z4 won't go up automatically. I am pretty good mechanically and electrically. I should be able to repair it. I would like to find a wiring diagram. Also where the up motor is located and or limit switches???

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This is how the motor looks in your BMW z4 car.
check fig
The convertable roof on my 2003 Z4 won't go up - 1deba00.jpg

Two relatively common issues with the Z4 tops is that the hydraulic fluid for the main top motor (the one that does the work after the header is unlatched) gets low. The other is that the main motor gets water trapped inside the plastic housing whcih causes the motor to fail. There's an updated housing that is supposedly more waterproof than the current housing, but if the failure is due to water ingress, then you'll also have to replace the top motor. If it's just low on fluid, you just fill it and it'll be good. There's a clear plastic reservoir for the fluid that'll show you if it's low.It's visible behind the left trunk carpet liner (which is also the area where the motor is located).
The reservoir is attached to the motor. It is down insid ethe body cavity where the top pivots on the body on the drivers side. To get to it you pretty much have to remove the complete top.
To remove the top manually please click on the above link
http://www.z4-forum.com/forum/viewtopic.php?f=32&t=11274
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To remove motor manually please click on the above link
http://www.z4-forum.com/forum/viewtopic.php?f=32&t=10190
((((((((((((((

Thanks. keep updated for any more query.you can rate this solutionand show your appreciation.

Posted on Jun 06, 2010

  • wgrunner Jun 07, 2010

    I think that you may have solved my little problem, although taking off that soft top looks like a bit of a chore. Here is what I understand.

    1. the roof must come off to get any access to the motor at all. even if all you have to do is add hydraulic fluid the soft top must come off. Is this correct?

    2. Great job on laying out how to dismantle the hydraulic motor. Do you have any photos or any other tips for the removal of the soft top. It seemed a wee vague in your explanation regarding the removal of the pump.

    Thanks Bill Walker

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If you can give me your e-mail address I can send it to you since FixYa limits post to 150k

however, you you mean the top won't go up automatically do you mean by touching the up button once

typically this is a result of a barking brake switch issue


Sean

Posted on Jun 01, 2010

  • 1 more comment 
  • wgrunner Jun 02, 2010

    Hello: What the heck is a barking brake issue????

  • Sean Reisdorf
    Sean Reisdorf Jun 02, 2010

    sorry,,, fat fingers

    Parking brake issues



  • Zoowho Jul 26, 2014

    Mine getsstuck in retraced mode. You can har the motor trying to move the top but nothing happpens, then it pops loose on it's own. I think this is the retrack latching mechanism holding the top down. May needs some lubricant or adjustment.

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1 Answer

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It will not show up with a typical P code from Autozone. It might show up with a dedicated code reader for specifically BMW. My code reader with BMW extended program does not show it. To trouble shoot this without a BMW code reader, try your buttons first, if you do not hear a motor noise, then you need to check if motor is getting power when button is pressed. Take of access panel in center of roof forward near rear view mirror. You will be able to access the motor there. Probe the electrical connections going to the motor and have someone push the buttons. Review the meter while buttons are pressed to see if motor is getting approx. 12 volts. If so then the motor may be dead. If there is not activity at the motor as far as 12 volts, then you have an electrical supply issue which could be several options: Electrical wiring, loose plug somewhere, a bad fuse (most common), a bad switch (probably not if both switches do not respond to electrical test), or a bad relay. Remember to check the truck are for the roof storage panel. If this is in the up position it will not allow enough roof for roof the store in truck and will not allow roof to move, retract.

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