Hi, the roof light has come on on the dash a couple of times while driving. At the weekend I tested the roof and it dropped with no problem but struggled when closing (but did) - does this sound like a hydraulic fluid is low? Perhaps light going on due to low fluid sensor activating when driving? Would be delighted to hear if anyone has had a similar problem! thanks!
roof light while driving and roof stuggling to close
- Thread starter gillianb
- Start date
tintoverano
Active member
I had similar symptoms when battery was not charged enough, it was also quite cold winter days - I just bought the car and had to try opening/closing the hood, then for several days I had not locked alert, till I decided to charge the battery, also the car is in the garage since
the light will stay on if its not fully into locked position i think
Smartbear said:gillianb said:
Hi, the light will come on if you try & activate the roof while going around a bend or over particularly bumpy ground.
Best done on smooth level & straight ground
Rob
I perhaps should have been clearer - I was just driving along without trying to activate the roof - which is why I wondered if the fluid was low then if might activate a sensor? The only time the roof has been down since the end of summer was to bring a christmas tree home
who ever said a z4 was not a practical car???
Deepseaskateboard
Senior member
gillianb said:
Its probably a microswitch.
Don’t mess with hydraulic fluid, as the roof system is very expensive.
If you can figure out at which part its failing on closure, you can use the guides on here to pin point the corresponding switch or sensor.
My guess is a microswitch has failed, as its a common fault.
Replacment at bmw is about £190
tintoverano
Active member
I had this couple of month ago (for me it was battery issue, see above) and researched it
here's the thread https://z4-forum.com/forum/viewtopic.php?f=45&t=75740&sid=66ddfbbbb0ac3feeac8d604b943550e5&start=15
for others it was a microswitch as Deepseaskateboard says
here's the thread https://z4-forum.com/forum/viewtopic.php?f=45&t=75740&sid=66ddfbbbb0ac3feeac8d604b943550e5&start=15
for others it was a microswitch as Deepseaskateboard says
The switch that has often been replaced was on the rear right boot ram, my problem was a intermittent connector down there.
Seems it has no locking mechanism. Once fully pushed home and cable tied, no more problem.
The switch tells the system the boot is fully open. My problem was as lid stowed in boot, the system would freeze.
I wonder if a break in any switch or cable, as they seem to have a continuity resistor in them throws up a roof light warning.
https://z4-forum.com/forum/viewtopic.php?f=46&t=106166
I think BMW know it's a known problem as the replacement microswitch is a one part cable and not two parts as they originally came out of the factory.
Seems it has no locking mechanism. Once fully pushed home and cable tied, no more problem.
The switch tells the system the boot is fully open. My problem was as lid stowed in boot, the system would freeze.
I wonder if a break in any switch or cable, as they seem to have a continuity resistor in them throws up a roof light warning.
https://z4-forum.com/forum/viewtopic.php?f=46&t=106166
I think BMW know it's a known problem as the replacement microswitch is a one part cable and not two parts as they originally came out of the factory.