Hell, second post, first with my own question.
I have a 2003 ECHO sedan, STOCK cookie cutter with auto, air, PS, and all OEM.
My question is this, did Toyota build all ECHOs with the same wiring harness? I just added the tweeters from my 2002 ECHO (tragically lost in battle with a parked semi truck last week

). I would have grabbed all the speakerss, but couldn't find them. (Car was opened like a can)
To my surprise, my 2003 ECHO that came with the base radio and 4 speakers, had the wiring for the dash speakers taped inside the opening.
I desided to do some more exploring, I pulled the interior light dimmer switch panel off and behind the coin holder, there is another unused connector, presumably for the POWER rear view mirrors.
Has anyone ADDED these features or other OEMs to a base or plain ECHO? To what extent does the harness exist? I'd like to add power locks, power mirrors and the digital clock.
Possible?