A696 code SOLVED *** and an interesting fix

[bigwinn]

Hi all

A696 code showing won’t clear

Roof movement preceded by ‘bong’ and roof movement impaired message on I drive and red icon on dash

Roof movement starts but:

Roof stops once on way down just before the mech stores itself into the boot and once on the way up just before the front shell hits the screen

Changed both hall sensors on the ram- problem persists

I’m guessing that now needs a full wire check?

I can’t find the wiring diagram on TIS anyone got one?

Cheers

Stuart

 

[RobbiZ4]

Hi Stuart,

Thanks for your mail.


E89: Collection of the 7 typical age-related defects in the roof environment
https://z4-forum.com/forum/viewtopic.php?t=148657

If you orientate on this list, the microswitches on the couplings should be replaced as well.

 

[bigwinn]

Hi Stuart,

Thanks for your mail.


E89: Collection of the 7 typical age-related defects in the roof environment
https://z4-forum.com/forum/viewtopic.php?t=148657

If you orientate on this list, the microswitches on the couplings should be replaced as well.

Roger that Robbi

Will do

I’ll report back

 

[bigwinn]

Curiouser and curiouser as Alice said

There have either been rodents in here or previous 'works'

The wiring for hall sensor HS2 (I think that's the correct one for A696 as opposed to HS1 for A691) has been rewired from sensor to the plug direct

I am going to check for continuity and resistance- what should I be looking for values wise?

Can anyone confirm that the wiring should go from the sensor to pins (37 for Brown) and (29 for Red) please however these colours may be incorrect due to rewiring... possibly was yellow/brown???

Also this wiring generally looks crunched yes?

RobbiZ4

your view please?

 

[bigwinn]

been for a walk and a think

the A696 code persisting I think is a red herring and the two issues instead of being related may be different...

So, I am going to replace the two microswitches to see if that solves issue one of the roof on its way down

then check the hall sensors relating to roof closing I haven't done yet, which are 1203 and 1243

See what that yields

Stuart

 

[RobbiZ4]

The wiring for hall sensor HS2 (I think that's the correct one for A696 as opposed to HS1 for A691) has been rewired from sensor to the plug direct

Have a look at the correct assignment:


Roof fault A696 Hall sensor
https://z4-forum.com/forum/viewtopic.php?p=1843524#p1843524

 

[bigwinn]

Oki

Pink relays swapped- no change
Microswitches renewed- no change
Rear hall sensors renewed- no change

No obvious issues with the hall sensors on the shells but new ones coming from BMW will rule them in or out

So back to square one

 

[bigwinn]

Someone somewhere had the same issue and symptoms but never reported back what the findings were

https://e89.zpost.com/forums/showthread.php?t=2048403

 

[bigwinn]

Or is it actually wiring that is the issue…

https://e89.zpost.com/forums/showthread.php?t=1529701

 

[RobbiZ4]

Indeed, check the wirings.
But, did you by this car already with roof faults?


Black 26-pole connector
HS-1
Pin 8 brown (signal)
Pin 21 grey (VCC)

Black 41-pole connector
HS-2
Pin 37 brown (signal)
Pin 29 red (VCC)

Important for all connectors of these hallsensors:
color to color (i.e. yellow to red)
brown to brown (!)

 

[bigwinn]

Checked the wiring elbows on the roof shells and I can’t see any breaks either side

Calling it off today

It’s still got me pulling a face that it stops in exactly the same place every time

Could this be a cvm issue? Or do I just need to go for my dinner

 

[bigwinn]

Running out of options

Wiring checked for breaks- none evident

Anyone got any other bright ideas?

 

[Chippie]

It’s possible that any breaks are only showing at a certain point, bend in the roof cycle, you could try running a pair of new wires taped to the outside of the loom from each hall censor, micro switch in turn back to the roof module, starting with the most probable culprit and working your way through just to be certain that the loom is in good order.

 

[bigwinn]

Good shout Mick

I’ve done that with the errant sensor already (hall sensor on the ram that always fail) back to the module pins

 

[bigwinn]

Right lads. A salutary lesson here

Robbi is (rightfully) the guru on the e89 roof- his constant mantra of sensors and microswitches are the absolute start point for us all and should not be ignored

However when your gut tells you something else is the root- don’t ignore it

The consistent fault with this roof said to me sensor, microswitches, wiring or control module

Having ruled every other route out, last to try was the CVM

This isn’t supported by conventional thoughts on the e89 community. However seeing modules continuing to degrade on the e85s, for the sake of 250 quid I tried a new module

SOLVED

All errors and persistent gremlins gone

It seems that the age old module problems are starting to show on this generation car

Thanks for the help and pointers everyone and Robbi

Picture of the removed module which looks like someone had been in it before…

Stuart

 

[B21]

There have been quite a few CTM induced failures recently …obviously it’s a bigger ticket item and it’s not an easy diagnosis without an A B swap..

Good you bottomed it out..

 

[RobbiZ4]

Well done!

This "old" but already replaced CTM looks a bit worn out, doesn't it? The two labels actually point to an eBay replacement part.

So far, I haven't seen any evidence of defective CTMs as a general problem. But who knows...

 

[B21]

Well done!

This "old" but already replaced CTM looks a bit worn out, doesn't it? The two labels actually point to an eBay replacement part.

So far, I haven't seen any evidence of defective CTMs as a general problem. But who knows...

I’m personally aware of 5 CTM failures FWIW

 

[RobbiZ4]

Well done!

This "old" but already replaced CTM looks a bit worn out, doesn't it? The two labels actually point to an eBay replacement part.

So far, I haven't seen any evidence of defective CTMs as a general problem. But who knows...

I’m personally aware of 5 CTM failures FWIW

I don't count those damaged by water/corrosion.

 

[B21]

Well done!

This "old" but already replaced CTM looks a bit worn out, doesn't it? The two labels actually point to an eBay replacement part.

So far, I haven't seen any evidence of defective CTMs as a general problem. But who knows...

I’m personally aware of 5 CTM failures FWIW

I don't count those damaged by water/corrosion.

Ah I do..same type of mysterious faults…