Im not sure mine is the same? are you talking about S1 or S2? Mines S2 and i think it could be different. All the things you describe dont seam to be behind my dash bits? I found the TCU and looked it up on google, got a bunch of stuff in jap and russian but i translated it and it seams to be the part im looking for? It does the key in ignition and reversing tones, it also controls the door locks. Im kinda sure it does the interior light timing and a few other things, but not 100% My fuse box also has some relays on it but when i trace my door switch wires i can only get them back to the TCU....