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Roof problems

flybobbie
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Roof problems

Post by flybobbie » Sat Apr 23, 2022 12:03 am

Wouldn't trust BMW to solve these problems
Colleagues car was a Friday afternoon lemon. Went back at least 4 times for them to claim they had replaced so many switches and sensors.
Ended up with inch and half thick of paperwork and invoices. All on warranty fortunately.
She never trusted the roof and stopped using it.
Got rid of car when park brake failed, last straw.

Rickg3
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Roof problems

Post by Rickg3 » Sat Apr 23, 2022 10:49 am

From past experiences with main dealers I was very reluctant to use again but impatience took the better of me. Legally can I go back to them and say enough is enough and drive the car away.

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Ole gits rule
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Roof problems

Post by Ole gits rule » Sat Apr 23, 2022 11:09 am

Rickg3 wrote: Sat Apr 23, 2022 10:49 am From past experiences with main dealers I was very reluctant to use again but impatience took the better of me. Legally can I go back to them and say enough is enough and drive the car away.
Not certain in all honesty where you stand but if the fault is not the control unit then you should not have that installed and I do not know where you stand with the labour.

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Phoenixboy
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Roof problems

Post by Phoenixboy » Sat Apr 23, 2022 1:35 pm

Have to say, the initial symptoms you gave are pretty much what I had .
roof had been fine, then stops mid closing, then press button again and finished closing.
later the same day, opened ok, but then stopped part closed, but then would not finish closing this time.
broken/frayed wire, which when you think about it makes sense.
the original wiring was not man enough down both sides of the roof.
my guy, replaced the wiring on both sides, as he rightly suggested it would end up failing if one side had failed.
they did the initial check for sensors, and then moved on to the wires.
A frayed wire would work intermittently until the contact breaks....
cost me about 200.00 all in which was mainly labour and a diagnostic check.
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flybobbie
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Roof problems

Post by flybobbie » Sat Apr 23, 2022 5:11 pm

Problem is dealer wouldn't want splice and fix a broken wire.
They would want to replace a whole harness.
BMW UK probably doesn't want to cover full harness costs, so dealer goes down the easy route of replacing modules first, keeping fingers crossed.

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Phoenixboy
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Roof problems

Post by Phoenixboy » Sat Apr 23, 2022 8:36 pm

My dealer did😀
All credit to them, I don’t use them for routine service, but they came up trumps on this, hence me leaving them a good review.
Westerly BMW we’re excellent.
E89 s drive 30i manual/gone
space grey
Carbon interior trim
19" Veeman FS 25`s
cruise control
m sport seats
stubby
led halo bulbs
z4 forum sticker, for added power.
OEM wind deflector
Gone, E85 Ruby Black.

Rickg3
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Roof problems

Post by Rickg3 » Wed Apr 27, 2022 11:50 pm

Well, I now have my Z4 back from BMW with a fully working retractable hardtop. I feel confident that all is good now. The control unit along with a hall sensor have been replaced due to corrosion. I did point out that my local garage had discovered a faulty hall sensor but advised a visit to BMW because of their superior diagnostics equipment. BMW's answer was, that if just the sensor had been replaced I would have been back almost straight away for the control unit. They have returned the original unit and sensor etc to prove the corrosion and it is very plain to see.
Due to my impatience, not waiting 3 weeks for my, not too local Indy to have a look I have come out with a hefty bill of £808 negotiated down from £900 and I was told BMW did not charge for any labour for the sensor and gave a large discount on both items!!!!
Hopefully the couple of things that need attention now I can manage and will enjoy doing.
Thanks all for your input.

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RobbiZ4
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Roof problems

Post by RobbiZ4 » Thu Apr 28, 2022 8:00 am

Interesting story.
Rickg3 wrote: Wed Apr 27, 2022 11:50 pm They have returned the original unit and sensor etc to prove the corrosion and it is very plain to see.
Could you please post a picture of the corrosion inside of your CTM? This is an extremely rare fault.
Rickg3 wrote: Wed Apr 27, 2022 11:50 pm BMW's answer was, that if just the sensor had been replaced I would have been back almost straight away for the control unit.
As a general advice, this is nonsense. It has to be checked individually after identifying the source of water.


This is a CTM with corrosion on it's chips:
20220326_154713_sm.jpg
20220326_154713_sm.jpg (105.05 KiB) Viewed 407 times
Pardon, je suis Allemand :oops:
:ant:
E89 Roof Maintenance
viewtopic.php?t=130932

Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
Image

Rickg3
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Roof problems

Post by Rickg3 » Fri Apr 29, 2022 12:19 pm

Sorry for delay in replying Robbi. I have attached some photos of returned parts that were replaced. Look forward to your thoughts.
Attachments
20220429_113039.jpg
20220429_113039.jpg (75.46 KiB) Viewed 376 times
20220429_113024.jpg
20220429_113024.jpg (56.37 KiB) Viewed 376 times
20220429_112722.jpg
20220429_112722.jpg (81.59 KiB) Viewed 376 times

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RobbiZ4
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Roof problems

Post by RobbiZ4 » Fri Apr 29, 2022 2:46 pm

Perfect, thanks.

In this special case I'd agree to replace the CTM, though all 4 plugs could have been cleaned up as well.

But the hall sensor was an absolute must to be replaced.
Pardon, je suis Allemand :oops:
:ant:
E89 Roof Maintenance
viewtopic.php?t=130932

Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048
Image

Rickg3
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Roof problems

Post by Rickg3 » Fri Apr 29, 2022 9:08 pm

Thanks for your reply Robbi, gives me confidence in BMW diagnosis. I did say ''could the contacts not have been cleaned' with a half smile but was met with a raised eye brow. The job had to be done right.
Working out labour time at BMW rates I think I was treated quiet fairly, but still flinch.

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