I recently followed the instructions here to install a wireless charging pad (this one from amazon: ) in my 2016 M4 Convertible.
I didn't bother to disconnect the battery as I found that it was such a pain to access the battery in the vert (still haven't found a good way - if someone does please let me know!). Probably a bad idea as I had the battery discharge to less than 65% (per Bimmerlink).
When I was done, comfort access wasn't working! The key fob worked fine to unlock/lock/start the car but the door handles weren't doing anything. Bimmerlink showed all kinds of codes - reproducing them below in case others have the same codes and are searching for them.
1C Integrated chassis management
5 errors
48010F: Dynamic Traction Control button - line interruption
482797: M-Drive - EDC - line break
4827EE: M-Drive - EPS - line interruption
482714: PDC line interruption
4827E1: Top - side view camera button line interruption
72 Driver's side footwell module
2 errors
030101: FH FAH, relay closing, no output voltage: relay adhesive or fuse defective or short circuit to ground
030181: FH BFH, relay closing, no output voltage: relay adhesive or fuse defective or short circuit to ground
I think the above were because I had to remove the buttons next to the shift lever as shown in the video above. Once I cleared them, they didn't come back.
But these were persistent and seemed to coincide with comfort access not working.
40 Car access system
2 errors
804107: Front interior antenna (IRV): Line interruption
8041A8: Welcome Light repeat lock active
After a lot of searching I found this post but for a 5-series:
https://f10.5post.com/forums/showthread.php?t=1242359
I removed the cupholders and figured I had forgotten to connect one of the cables! This cable is a small black connector that goes into a small module right below the cup holders. I previously wondered what this module was when I doing the install. Now I knew! Looks like this module has the antenna for comfort access.
Once I reconnected that and put everything back together comfort access was working again!
Just wanted to document this here for future reference.