I know I'm late to the party but I'm SO excited! I bought my L322 a little under a year ago and have slowly been working on it's issues and this one has been the toughest to crack! I've replaced struts and airbags, swapped EAS modules, checked the compressor, cross valves, reservoir, hoses and corners for leaks, tested different sections of the CAN bus with a multimeter. Honestly it was getting nightmarish. Even bought wheel speed sensors but hadn't installed them yet. Then I came across this post and some posts from our BMW E39 Bosch ABS ECU sharing brethren and presto! Mine turned out to be the ABS modulator. I checked the short harness and ground per the service bulletin and all seemed fine, no corrosion or anything so I ordered a used ABS unit. I DID NOT have to removed the brake lines. I simply just took out the 6 T20 Torx screws holding the modulator to the block and swapped the unit I bought with mine. Took me 5 minutes because I cleaned up the donor part and mating faces. Started her up, and cleared the codes. I now had yellow BRAKE and ABS lights, I turned lock to lock many times, even watched the live data feed from the steering angle sensor and the readings lock good but it didn't clear it. I had to go into Calibration on my IID Tool and calibrate the sensor and then BAM! Air Suspension/HDC and traction control back! I may send my old ABS modulator out to be rebuilt considering the donor one has a little over the mileage mine does and the solder on the circuit board wears out after 10 bagillion heat cycles haha. But for now life is good. Thank you 2021 and thank you to everyone who added to this post. Thanks Sabbsy. Hopefully someone finds my addition helpful.
