I have spent the last week chasing an electrical niggle. I nearly kicked the stupid thing so hard, so many times. After relocation of all the fuseboxes it appeared that the 'you've left the door open with your keys in, you twat' buzzer went off every time the door was opened, regardless of whether the keys were in or not. I spent yonks systematically reversing my changes, double checking wiring, unplugging things etc - no joy. Then I stuck a multimeter over the relevant pins in the ignition barrel multiplug that switches if the keys are in, and found it wa a continually closed circuit, regardless of key presence
Hnnnnnrrrrrrrr,
Now all I have to do is redo everything I did, then subsequently undid. Stupid car is stupid.