[cosmoxi]

Hi. I am getting an error when trying to code the ASS memory on a 2021 M550. The app/adapter are working for other functions. Has anyone had this issue? Thanks!

[marsb007]

Originally Posted by cosmoxi

Hi. I am getting an error when trying to code the ASS memory on a 2021 M550. The app/adapter are working for other functions. Has anyone had this issue? Thanks!

You need to make sure the car is in ACC mode, or diagnostics mode. With the engine off, press Start/Stop 3x rapidly and it goes into ACC/Diagnostics.

You can't code it with the engine on (it codes the DME module). Hope this helps.

[cosmoxi]

Yes, that was it! Thank you very much.

[cosmoxi]

A follow up observation... After I coded the ASS memory I have had intermittent trouble with the roof function switches (lights and sunroof switch) not working. They flash when they are not working properly. I used the bimmercode app to go back to the update but that has not helped.
I did the OTA update that was available today, will monitor to see if that makes a difference.
Of course this could also be a coincidence!

[marsb007]

If you have Esys, you could try VO coding the module and getting it back to stock, but I think it's just a coincidence. I don't think the DME module controls any of the switches that are now having an issue...

I assume ASS got coded properly? If so, Bimmercode did change the correct parameters and it didn't have anything to do with the switches.

Either way, I was planning on doing it, but now since you're having those issues I might hold off on doing any modifications to that module... keep us updated.

[cosmoxi]

Yes the ASS memory did code properly.
I did forget to mention in my post- right after I coded the ASS memory (this was the only parameter I changed) and the system re-booted, the center roof lights were flashing. I believe it is related.
It continues today, sometimes time those roof lights/sunroof work and sometimes not. No pattern to it.
I don't think the OTA update helped.
I have a service appointment on 12/15.

[marsb007]

Any updates? I haven't coded ASS on mine yet..

[Qsilver7]

Originally Posted by cosmoxi

...It continues today, sometimes time those roof lights/sunroof work and sometimes not. No pattern to it...

Have you done a sunroof reset? Since some things with the G-chassis models have changed...instead of just giving the reset instructions from past BMW model chassis...I’ll refer you back to your owners manual for the procedure in case BMW changed it like they did with the “diagnostic mode” which requires 3 quick presses of the start/stop button (instead of just 1 press).

BMW sunroofs have always required a reset when power is disconnected (car battery) or if there are issues...a reset usually fixes this. In the past you needed to turn the ignition on (G-chassis may require 3 presses...so check owners manual)...then press & hold up on the sunroof switch button until the roof panels went through a procedure that took approx 20-30 seconds...but again, check you owners manual (or the iDrive manual) for the sunroof reset procedure.