Roof fault
- Thread starter flybobbie
- Start date
Post by Smartbear » Sat Mar 23, 2019 7:18 pm
flybobbie wrote: ↑Sat Mar 23, 2019 6:25 pm
Well this has caught up with me, hood stuck in boot, but boot lid lifts and closes ok.
Did go intermittent for a few minutes then stopped with roof in boot.
Almost like something finally failed, sensor, broken wire?
Have you tried swapping the power relays over for the roof? There’s two of them i understand & i think they’re interchangeable :?
Have you hooked it up to a code reader? That could shed some light on what’s wrong.
Rob
I now claim my mystery prize
Rob
flybobbie wrote: ↑Sat Mar 23, 2019 6:25 pm
Well this has caught up with me, hood stuck in boot, but boot lid lifts and closes ok.
Did go intermittent for a few minutes then stopped with roof in boot.
Almost like something finally failed, sensor, broken wire?
Have you tried swapping the power relays over for the roof? There’s two of them i understand & i think they’re interchangeable :?
Have you hooked it up to a code reader? That could shed some light on what’s wrong.
Rob
I now claim my mystery prize
Rob
Very clever, yes it turned out to be a relay.
But what threw me was the fact the boot would rise and fall so just assumed, looking at the wiring diagram that each relay would switch motor one way or the other, so they were fine.
When the boot was fully open pump would stop.
The positive and negative of the coils are connected to the module, rather than negatives to body earth.
So the top module can drive the relays for the boot, but then decide not to lift the roof.
Had the relays apart and the contacts look ok.
The code reader gave 4-5 switch errors, in red with A codes.
But what threw me was the fact the boot would rise and fall so just assumed, looking at the wiring diagram that each relay would switch motor one way or the other, so they were fine.
When the boot was fully open pump would stop.
The positive and negative of the coils are connected to the module, rather than negatives to body earth.
So the top module can drive the relays for the boot, but then decide not to lift the roof.
Had the relays apart and the contacts look ok.
The code reader gave 4-5 switch errors, in red with A codes.
I initially didn't think the relays were a problem because looking at the circuit diagram the relays appear to be arranged to switch the pump forward and reverse, so to speak, as in 'H' arrangement for reversing a electric motor. So the boot would rise and fall.
But a pump doesn't really need to reverse, only the valves that control the cylinders need to switch, a bit like compressed air cylinders.
So only one relay no2 is needed to raise and lower the boot, with appropriate valve switching.
Failure of relay no1, must be stopping the roof cylinders from operating as the pump wasn't running.
In fact can't see why it would need the second relay. It only needs to turn the pump one way, the rest should be done by switching valves.
On the bench i can't find anything wrong with the relays, both have 77ohm coils and a zero resistance on the contacts and all move, whether inside or outside their cases. The only other possibility is inside the sockets they plug in to.
Not finding something actually faulty is bugging me.
But a pump doesn't really need to reverse, only the valves that control the cylinders need to switch, a bit like compressed air cylinders.
So only one relay no2 is needed to raise and lower the boot, with appropriate valve switching.
Failure of relay no1, must be stopping the roof cylinders from operating as the pump wasn't running.
In fact can't see why it would need the second relay. It only needs to turn the pump one way, the rest should be done by switching valves.
On the bench i can't find anything wrong with the relays, both have 77ohm coils and a zero resistance on the contacts and all move, whether inside or outside their cases. The only other possibility is inside the sockets they plug in to.
Not finding something actually faulty is bugging me.
Attachments
Don't think that will happen as there is a thermal cutout, unless that goes faulty.
What puzzles me is the fault codes that came up saying that 5 or 6 sensors on the roof were faulty, when they all worked fine.
My business partner had a 2012 car with only 8k miles and it's roof was constantly failing, even though BMW replace probably all the micro switches on three separate visits. When fixed they said they had cycled the roof many times without problem.
Yet when driven away and used for a few weeks, the roof would fail again.
If on failure all they were doing was reading the codes and then just replacing the (faulty) sensors, then finding the roof was working, was that just coincidence?
The relays i replaced worked fine on the bench.
Or is there something wrong with the controller?
Or is it a symptom of the power cable call backs BMW have instigated.
I have ignored the call back, but perhaps should have it done.
What puzzles me is the fault codes that came up saying that 5 or 6 sensors on the roof were faulty, when they all worked fine.
My business partner had a 2012 car with only 8k miles and it's roof was constantly failing, even though BMW replace probably all the micro switches on three separate visits. When fixed they said they had cycled the roof many times without problem.
Yet when driven away and used for a few weeks, the roof would fail again.
If on failure all they were doing was reading the codes and then just replacing the (faulty) sensors, then finding the roof was working, was that just coincidence?
The relays i replaced worked fine on the bench.
Or is there something wrong with the controller?
Or is it a symptom of the power cable call backs BMW have instigated.
I have ignored the call back, but perhaps should have it done.
A
Anonymous
Guest
RobbiZ4 said:
Are you a rocket scientist in your spare time?
Serious respect!
https://drive.google.com/file/d/0BxW-0N8LT84fU0FDNFUwak9KM1k/view
No idea original source.
Wiring diagrams seem a bit easier to understand than Tis.
The Foxwell just a reader but also shows real time graphs.
Only just got into it, to fix my roof problem.
I wonder if the new solenoid anything to do with operating the roof on the move.
No idea original source.
Wiring diagrams seem a bit easier to understand than Tis.
The Foxwell just a reader but also shows real time graphs.
Only just got into it, to fix my roof problem.
I wonder if the new solenoid anything to do with operating the roof on the move.
