Thread: SLS problem doing my head in

Maybe your nanocom is playing up. No setting the commands.
I recall you had many attempts trying to synch the BCU and ECU and then it seemed to work.

But it seems to remember the settings, and pumps back up to there when I restart the car (sometimes takes a few attempts to remove the sls warning light when at bumps). So the settings, in my opinion, have saved.
The bcu sync thing was why I upgraded the firmware haha!

So if i understood well it keeps level OK while driving and over night but goes down to bumps when you unlock and open a door then it goes back to level when you start the engine?

if it's so you should rule out a sticking exhaust valve so before you leave the car over night go to the compressor housing and unplug the exhaust valve(C0781, the black one which is alone on the compressor) and leave it so... then if it will not go down in the morning when you open the door it means we are closer to the issue

Thanks for the input sierra.

Tackled it further this morning, strange issue I found was the sls warning light wasn't going out after a few ignition cycles like previously. Plugged nanocom in and left height sensor reading 000.

So I swapped out the sensor with another known working one, and still 000. This narrows down to slabs or wiring, right?

Took the slabs out and replaced with newer d2a version, programmed to air and checked height sensor. Still 000.

Told the nanocom to start pumping the left bag anyway, and eventually it started registering?

Only thing I can put it down to now is the connector, or possibly a bad ground somewhere?

I still took off the exhaust valve connector as directed, that will just confirm it's to do with signal, and not the bags or hose connections.

Here are the nanocom screens showing aa reading then no reading!

Check connectors C0391, 0392 round yellow and grey near the fusebox to not have bad contacts or corrosion(disconnect the battery before you unplug them cos a fault will be logged in the SLABS which will stop it work untill it's erased... double check the mode to not be on transport cos it's important, with a good SLABS if it's a wiring issue to the sensor it should log a specific open circuit fault code, also it's compulsory to have a code logged as long as the SLS warning was on due to a fault not due to transport mode when it's on without codes and the rear goes down to the bumps... unplug a sensor and start the engine for few minutes then read the fault code, you MUST get open circuit for that sesnor...if not it means that nanocom is failing again cos it happened not once... not long ago a fellow from d2boysclub was in quite similar situation, nanocom didnt show any fault but plugged in autologic and it got the fault code, here is the link if you are registered D2BC.co.uk • Login

i've copied the pic of autologic reading while nanocom shown no fault code, unfortunately it seems that it makes tricks with SLABS too not just with ACE so if you have the chance try with a hawkeye, lynx, T4 or autologic cos these are all on original testbook main dealer protocol not like nanocom cos you might work in vain relying only on nanocom in this area

That's concerning, I haven't been able to read any codes at all from SLS faults! I thought it was strange, given the sls warning light was on...

I'll check the connectors you mentioned, was also thinking I'll replace the height sensor connector with another off a wreck.

Frustrating! Will have to try and find someone with a testbook equivalent!

Also, just confirming sierra, the plugs are near the inside fuse box? Not the engine bay one?
At work, I don't have rave to check 😟