Buffalo4,
You said "if", not "when". "When" would sound much, much promising and encouraging.
Last night I pulled all (almost all) relays in engine bay - the drain (0.16A) didn't change. Then I pulled the fuse that powers something I can live without.
So, I will tackle easy things (in my opinion easy) one by one, from less important to more important.
PCM - that's the onboard computer (aka ECU). currently I have used one installed (with my vin number programmed).
If PCM is suspected to be faulty or just for kicks, I can put back the original one and see if the drain issue is the same.
Multiplex control units - what are they for? Airbags sensors, seat belt sensors, door locks, window regulators???
The reason I'm asking these "dumb" questions is that regular repair manuals (like haynes or chilton) don't give any "in-depth" information. I even searched for the fuse box(s) diagram and they don't have any info about it. Hegelian dialect in all its beauty.
I read some post about sliding door buzzer malfunction...
All items on your "Buffalo's list" functioned normally.
Off topic -
There are two things/areas that bother me:
1 - upstream O2 sensor's heating element wires go from the sensor to Junction J27 (if I remember correctly) with 21 contacts. This junction point is near PCM (probably left to it).
According to wiring diagram, the wires must be, let's say< yello/green, green/yellow (again, I don't remember by heart). There are NO wires with these colors that come to this Junction point. This condition throws an error code and lights up CEL. I didn't check which wires (in Junction point) go to O2 sensor, yet.
2 - There's another plug (junction point?) in engine bay, that hangs there idle and doesn't connect to anything at all, it's already corroded. (link -
Mystery connector in engine bay )