MYSTERY SOLVED !!!!!

I decided to follow the KISS principle and start with something that was not working, but was simple : The dome & trunk light were not working.
Grabbed the schematic, saw fuse 9 in the under hood accessory block was common.
Pull that and took a look, looked OK, but I decided to meter it anyway. SURPRISE !
Even thought it looked OK, it was open.
Replace F9 and now the dome light works, the trunk light works
AND THE DOOR LOCKS WORK FROM THE REMOTE, ALONG WITH THE ALARM SETTING !!!

Go figure.

( Thanks everyone for their suggestions )