Another e85 roof issue 😵‍💫

[enuff_zed]

Really kind of you but I'm miles from you. Bracknell im Berkshire. About 4 hours.

I owe you a beer when I'm next up at my inlaws holiday place in Wigton....from when you last helped me out. I've ordered a couple of roof relays (purple ones)....just because and just in case

Can the back of the satellite module be removed to check for inside corrosion and cleaned up if necessary.

The previous owner had it for 8 years and 5eally just used it as a weekender so not sure if it would have been him fiddling with tge warning lights

Bracknell is only just over 2 hours from me.
There is a possibility I may have to go to sort an airbag issue in Bournemouth in the next few weeks. If so, I'm not far off your doorstep on my way.

I have heard of a couple of lucky people who have opened the module and heated it with a hairdryer which sorted out a dry solder joint. I'll be honest, I think yours is past that point, but nothing to lose, so you may as well have a go.

 

[10stb]

@10stb - been looking further into the wiring diagrams. As far as I can see, each module has it's own power supply. They don't take power from the K-Bus, so in theory that should only carry a voltage with ignition on and the modules powered up?

These are the modules.

I opened up the nearside satellite unit which had corrosion inside. A toothbrush and electrical cleaner has worked wonders but not sure if there's been terminal damage

 

[10stb]

Bracknell is only just over 2 hours from me.
There is a possibility I may have to go to sort an airbag issue in Bournemouth in the next few weeks. If so, I'm not far off your doorstep on my way.

I have heard of a couple of lucky people who have opened the module and heated it with a hairdryer which sorted out a dry solder joint. I'll be honest, I think yours is past that point, but nothing to lose, so you may as well have a go.

Bizarrely, air bag never flagged on the code reader

 

[enuff_zed]

Damn! You have one of the rarest SBSL. Best hope it’s not dead or you’ll take a while finding a replacement.

 

[enuff_zed]

@10stb - I have one other thing to check:

The K-bus links all the modules. It is also the medium by which the OBD reader checks for faults.
If a module is playing up it can affect other modules but it can also mean that the dud module doesn't show up on a code read.

You said you didn't get any airbag codes?
The satellites both report back through the centre SIM85.
Can you check to see if the code reader actually saw the SIM85, or whether it showed no codes because it didn't see it?

If that is the case, then try unplugging the SIM85 (just the black electrical plug) and see if other stuff then starts to work properly.

 

[enuff_zed]

Don't you just love it when some to$$er spams a thread!

 

[10stb]

Don't you just love it when some to$$er spams a thread!

I ignore them bud.

Off today so have just cleaned up the satellite modules with contact cleaner/soft brush, and air line and hairdryer

Hoping that today is a day for a small win. Been taking so many steps back at the mo

 

[10stb]

Don't you just love it when some to$$er spams a thread!

Not sure if its a small win or a step back, but.....

When I remove all the wires from the k bus comb and test them for voltage.

1 says 12v, 1 says 10v and the rest are 0v.

AI suggested that the 10v was causing a communication problems on the k bus.

I've just followed your suggestion and removed the connector from the centre console air bag module and the reading has now down to 0v.

Not sure what this tell me apart from that I now know that k bus wire goes to the air bag module.

Is this a small win or not

 

[enuff_zed]

Not sure if its a small win or a step back, but.....

When I remove all the wires from the k bus comb and test them for voltage.

1 says 12v, 1 says 10v and the rest are 0v.

AI suggested that the 10v was causing a communication problems on the k bus.

I've just followed your suggestion and removed the connector from the centre console air bag module and the reading has now down to 0v.

Not sure what this tell me apart from that I now know that k bus wire goes to the air bag module.

Is this a small win or not

That tells me you have a fault in the SIM85, which is what I was hoping to see. It does mean you need to slave in a new module though before you go any further

 

[enuff_zed]

Try cleaning the SIM85 plug. But also check for corrosion or missing pins in the module. With it unplugged does the roof work now?

 

[enuff_zed]

Don't you just love it when some to$$er spams a thread!

Which now looks daft as the mods have removed it.

 

[enuff_zed]

@10stb - I am still of the opinion that you need to successfully deal with the airbag modules first, and hope that cures the K-Bus issues and potentially the other problems too.

It is looking like you need an SBSL, a SIM85, and a new plug for the SBSR, at the minimum.
Going rates for each module are around £125 atm, but that very rare SBSL could be a lot more IF you can find one.

Short term fix could be to unpin the K-Bus wires from the SIM85, which will stop it corrupting the rest of the system, but will obviously leave you with an airbag light. Whilst not a very kosher solution, having the airbag light blanked off will result in just an MOT advisory, not a fail, as would be the case with the light permanently on. No idea which, if any, airbags would still operate though.

Let me know if you need any parts or assistance.

 

[enuff_zed]

 

[enuff_zed]

 

[enuff_zed]

 

[10stb]

That tells me you have a fault in the SIM85, which is what I was hoping to see. It does mean you need to slave in a new module though before you go any further

Just stripped down the centre console module, cleaned with electrical cleaner and retested....still 10v. Was worth a try.

I've drawn a line under it for today as I'm heading into London for a show...wife's birthday.

Thanks for above info enuff_zed.

Really appreciate your efforts.

Will drop back onto the car tomorrow

 

[10stb]

View attachment 289117

Morning enuff_zed

Plan on carring on with the car today.
The air bag problem corrupting the k bus has thrown me.

There were no air bag codes, warning lights or advisories on mot history.

Nothing was disconnected, apart from the 2 brown wires (well 1 brown, 1 brown/red I think) from the offside satellite module connector.

The car is my rebody project so not sure if the air bag system would work in it. That said, it would be wise for it to work properly and for me to disconnect it if need be.

My main priority, when I started going down this rabbit hole...was to try and get the roof working again after the battery went dead.

Once again, thanks for all you kind words and advice

 

[enuff_zed]

Morning enuff_zed

Plan on carring on with the car today.
The air bag problem corrupting the k bus has thrown me.

There were no air bag codes, warning lights or advisories on mot history.

Nothing was disconnected, apart from the 2 brown wires (well 1 brown, 1 brown/red I think) from the offside satellite module connector.

The car is my rebody project so not sure if the air bag system would work in it. That said, it would be wise for it to work properly and for me to disconnect it if need be.

My main priority, when I started going down this rabbit hole...was to try and get the roof working again after the battery went dead.

Once again, thanks for all you kind words and advice

Morning.
My theory is based on you saying there is no airbag light on initially switching the ignition on. It should do a self test for a few seconds. This suggests to me it has been blanked off. If so, and no codes showing, it implies that no signal is coming from the SIM85 through the K-Bus, pointing to a failure within that module. As I said, the satellite modules report back through the SIM85, they are not connected to the K-Bus themselves. Therefore, a failure in the SIM85 K-Bus output will prevent any communication from the satellite modules too. You have already determined that the errant 10v is produced from the SIM85.

The lack of advisories could simply be an MOT Inspector not checking that out. I've seen that several times when i've found the light taped over.

As I said before, a problem in one part of the K-Bus can cause other things to fail.
As an example, I found an airbag light taped over. On investigation I found the K-Bus to the SIM85 was cut and taped up. When I reconnected it, the wipers, radio and roof stopped working. Fitted a new SIM85 and coded it in: everything back to normal.

Hence my suggestion that you unplug the SIM85 and see if other stuff starts working again.

 

[w1ndsurfnut]

Another update....

You're not going to believe this. Put the 3rd roof module on. Had a cuppa and wrote post above.

Just gone back out to the garage and now the roof is working as it should

Maybe repairing the cables has done the trick...or something has moves when I've put it back together.

I'm not holding out much hope as it did this before with the 2nd roof module.

Thanks for your advice guys....particularly enuff_zed. Top man

How's your roof holding out. Mine has stopped working and I suspect wires in roof..

 

[10stb]

How's your roof holding out. Mine has stopped working and I suspect wires in roof..

Its not holding out. Battery went flat over Xmas and now im back to square 1......or worse than that as everything's stripped out