E89 Z4 convertible top harness

image Let the fun begin,,,,E89 Z4 with hard top convertible,,,,the convertible top stopped working,,,,so I had to open the rear trunk with the computer and release the hydraulic pump pressure,,,,so I can move the top panels,,,to gain access to the top harness and hydraulic lines,,,you have to remove all the rear trunk panels.image Next to the battery is the hydraulic pump and relay,,,the new harness  comes with new hydraulic line,,,,so I also have to bleed all the lines once the job is done.image So the best way to get to most of the harness was to stack the two panels on top of each other,,,,since I released all the pressure in the system,,,I can manual move each panel to gain access to the wiring harness and lines,,,which run on both sides of the convertible top.

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15 Responses to E89 Z4 convertible top harness

  1. Tyler says:

    I need to replace my harness – where’s the rest of this post? Please help.


    • Sorry that all ,,,,that was such a big job and a pain in the ass I just gave a brief idea what this job was about,,,,,and to get pictures wasn’t easy,,,,the best thing I can tell you when removing the harness and hydraulic lines you should follow in with the new one right behind it,,,,so you follow the same routing path.,,,,take pictures or video of the layout of everything,,,I can tell you there is no repair manuals from BMW on this job,,,,they didn’t even know how much to pay me because there was no labor operation on this job.


  2. mike cundiff says:

    I can relate to your frustration, my top stopped working so I took it to a foreign auto repair shop that had been in business since the 70’s. I thought they would do a good job. HA!!! got it back worst than it was when it went in. They said it needed a new pump motor. So I bought one and replaced it myself carefully labeling every line to the numbered port on the pump. I have a schwaben obd tester especially designed for bmw so I got the system reset and wow. cylinders started acting all crazy. My best guess is that they got the lines switched around. Now I have no idea which line goes to which numbered port on the pump. I know this is a long shot but do you have it wrote down somewhere which lines on each cylinder go to which numbered port on the pump unit? I have poured through forums youtube vids and downloaded every BMW repair manual available to try to find this info. It’s nowhere to be found. I have the 09′ z4 e89.


    • Oh my god I feel for you,,,,I’m sorry I did not write anything down,,,,I replaced and rerouted the pair of hydraulic line to each cylinder one at a time so I wouldn’t have this problem,,,,,BMW doesn’t have a hydraulic schematic for the lines,,,,I hate to say this but if you can find the same car and comparing your car to the good car


      • Tyler says:

        Mine was a 2011, but when I switched everything out, I noticed that the lines and the pump had corresponding numbers on them. They’re kinda hard to see, but they were there. After pulling my back out, I at least got the pump working, but it was quite the ordeal. Good luck.


  3. mike cundiff says:

    thanks for the feedback guys. I really do not know anyone else with the same year model and make of mine that I could compare it to. Tyler I will look harder to see if I can see line numbers. If I can figure this out I will post it on all the forums so the info will be out there. Thanks again for the feedback.


  4. Stuart says:

    I have to replace a leaking line on my 2010, do they self bleed or is there a certain procedure for it.


  5. Bryan Hoag says:

    BMWTechnician, I’m starting to develop an issue with my Z4 convertible top. I think its a harness issue. Are you still repairing these? I’d rather pay someone to do it right than mess around with it myself and make the problem worse.

    Liked by 1 person

  6. Bryan Hoag says:

    Where are you located? Any chance you can contact me directly at bryan.m.hoag@gmail.com?


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