Yep, another roof issue.. can someone help me?
- Thread starter warmasice
- Start date
Deepseaskateboard
Senior member
RobbiZ4 said:
When mine was fixed, the BMW tech said they fitted a revised wiring loom. It’s a pre LCI car, so it’s probably already fitted to newer cars.
It was a fault on one of the microswitches on the roof arms.
I will see if there is a part number on the invoice.
But I need to dig it out…
Yes, I wasn't aware of an updated wiring loom? I understand that people replace the broken wires with a fresh ones (not sure exactly what type is best though).
It's raining at the moment, hopefully will clear up in the next couple of days for me to check the wires.
I'm assuming the symptoms are more related to wiring than micro switches? I don't know.
It's raining at the moment, hopefully will clear up in the next couple of days for me to check the wires.
I'm assuming the symptoms are more related to wiring than micro switches? I don't know.
warmasice said:
At first, for all of you guys:
The red flashing LED is no fault indicator.
Don't know, how often I've alread written this. It only indicates, that the roof is neither completely opened nor closed. Nothing else.
Guys, it might be better to not flood the OP with tons of hints catched anywhere in this or other forums. It doesn't help anybody, who has a roof issue for the first time. Better to collect a checklist of diagnostic steps in the HowTo section of this forum. Makes life easier ...
There is a German proverb:
can't see the forest for the trees.
That hits the point, if a dozen of guys post anything they've found anywhere as an endless list of hints.
Think about yourself in this situation, where you never had a look at the roof construction on your Z4 before. You don't know where to start.
The percentage of more than 90% issues with broken wires is very speculative. In my statistics, it's about 23%, and I've seen a lot.
@warmasice
The diagnose of the source of your issue is not so easy, as all of those former hints in this thread suggest.
In your case it could be:
- one or two rusty hall sensors on the hydraulic ram of the trunk lid on the right
- one of the microswitches next to the same hydraulic rams on both sides
- not sure that a wire is broken based on your latest description, but this will happen as next issue
The maintenance thread is a source of info, everybody should have a look at.
https://z4-forum.com/forum/viewtopic.php?t=130932
Deepseaskateboard
Senior member
warmasice said:
To my knowledge, they replaced both.
I think the newer microswitch does not fit with the older connector, so they have to replace the wiring. I think the wiring is also a little longer so it isn't under as much stress.
If your car is LCI, then it’s probably already got the updated parts, but not sure.
Deepseaskateboard said:
Sorry for bothering you.
But that shows how less clue even the BMW guys do have!
Background:
In 2012, the hydraulic pump got a fourth electrical solenoid to support opening while driving in a safer manner. It got a new part number.
The CTM had to be enabled to control this additional solenoid. It got a new part number.
The hydraulic loom had to support this as well with two additional wires. It got a new part number.
Nothing else was changed, no mechanical improvement, no quality improvement of any of the materials. Nothing has changed except this additional electric/hydraulic feature.
But that got the source of all rumours. :rofl:
Robbi you're very knowledgeable, I must say.
I'll check the wiring with the roof up by removing the cloth tape and see what I can find. If there's no issue, I'll move onto replacement of micro switches and then maybe hall sensors. The more I read, the more confident I feel that it should be reasonably straightforward... I hope!
I'll check the wiring with the roof up by removing the cloth tape and see what I can find. If there's no issue, I'll move onto replacement of micro switches and then maybe hall sensors. The more I read, the more confident I feel that it should be reasonably straightforward... I hope!
Ah ok. I was thinking of taking a look at the ones at the edge of the roof as seen here at the 10min mark: https://youtu.be/3q52HtkK6mU ...I know that's a very specific scenario but I think I'll take a look anyway, just to eliminate it if anything.RobbiZ4 said:
Just to confirm, there are two hall sensors on the right ram, correct? Can they be cleaned at all?
I really do appreciate your advice. Thank you.
Yes, there are 2 on the right, none on the left.warmasice said:
What dou you mean with "clean"?
They have to get removed for checking, replaced with new ones if rusty, nothing else.
Here is a link to pics:
https://z4-forum.com/forum/viewtopic.php?p=1921079#p1921079
Well, in this special case it means, that it's electromagnetical functionality is destroyed and it doesn't work anymore as intended. This can't be cleaned and has to be replaced.warmasice said:Yes, just meant if rusty. Thanks, I'll take a look at the link my friend.RobbiZ4 said:
I am certainly no expert but the failure seen is very similar to what I had and Robbie diagnosed this, went to a local and indy and they confirmed microswitches.
Deepseaskateboard
Senior member
No, part B61 is a short cable adapter for this microswitch coupling fastener to support an improved plug(!) format.
That has nothing to do with the critical and expensive hydraulic harness in the roof, we are always talking about (and where the sensor wires will break). It cost's more than 1.000 Euros (54377311084). 8)
https://www.realoem.com/bmw/de/showparts?id=LM51-EUR-05-2011-E89-BMW-Z4_30i&diagId=61_4719#61132359999
That has nothing to do with the critical and expensive hydraulic harness in the roof, we are always talking about (and where the sensor wires will break). It cost's more than 1.000 Euros (54377311084). 8)
https://www.realoem.com/bmw/de/showparts?id=LM51-EUR-05-2011-E89-BMW-Z4_30i&diagId=61_4719#61132359999
Deepseaskateboard
Senior member
RobbiZ4 said:
I was meaning wiring, not hydraulics!
It’s expensive if they go awry.
So this is an adapter which allows the old wiring to be connected to a new version microswitch?
