My hearing isn't what it used to be, but I noticed that sometimes I wouldn't hear the chirp. I also noticed that one of the lock actuators was operating after the others.
I was having an intermittent brake light failure, so I cleaned the grounds in the right rear side. Then I checked the wiring harness that goes through the rubber tube into the trunk. I found a wire on which the insulation was broken. This was the red/black wire that supplies power to the trunk lock through fuse 53. I wrapped some tape around the wire and the whole harness.
I don't know if it was wrapping the wire or cleaning the grounds or something else or just luck, but since then the locking and the chirp and actuators work like normal.
2001 530i/5 S+P CDV delete/Akebono ceramic pads
M5 SSK/RedLine MTL/M5 rear sway bar/Bilstein HD
BMWCCA Member #337964