[Rajmun340]

Helmsman, thanks for the update. sorry to see you've reached the same stage with your dealer as mine and they did the same reprogramming.

I am a bit ahead of you on a few things but still haven't solved the issues.

With the car turned off, after unplugging both the front struts connectors i've measured the front solenoids resistance for continuity, got 2.2 ohms on both. Fine. With a voltmeter i also measured the signals coming from the edc. Got 0.409 V on the front left and 0.015 V on the front right. This is actually normal as both solenoids on the same axle are serially connected with power feeding to the FL, the center node most likely weakly pulled down to ground when off by the edc module and the FR returning to ground (it's a pwm drive output stage i won't go into details).

This does not prove the edc is working in normal operation (i don't have adapter to test with car turned on and dealer is ignoring me plainly) but no obvious electrical faults were found.
This lead me to a second theory. A faulty but not failed speed sensor. This could offset the edc algorithm computations without triggering any error codes.

Also i have a weird drivetrain noise which i'm wondering could be a faulty wheel bearing. forum threads indicate there have been factory defective batches of rear wheel bearings failing at very low mileage (several 2012 cars). There is more to it. Our wheel bearings have an internal magnetic disc that generates a square wave when read by the speed sensor. Forum archive showed that when the speed sensor fails (usually with error codes though) the wheel bearing had to be changed too.

Then i remembered that servo steering maps are speed dependent too. This may be the common link i have been searching for with both edc and servo modes not functionning. All this is still highly hypothetical.

One thing is not hypothetical and that is the dealer foreman knows little about these cars and they're trained by bmw so they don't do any thinking outside what the diagnostic tools tells them. Their diagnostic is based on error codes and they never assume one second that this system has holes. We know it does, but they're in denial and they're escaping their warranty responsibility.

Cheers