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The wiring harness is behind and underneath the glove box. You remove the glove box door, then remove the cover underneath that, over the footwell - a couple of Philips head screws (Hmm, actually, I'm not sure you need to remove the door, now that I think of it - I just did). There are 3 connectors going into a white box bolted to the cover - the middle connector is the X253, which is the one you want. It's got 54 pins (3 levels of 18), and you connect the wires from the TR7 as follows:
Down Module
White - pin 20 (unlock signal detect), white and black wire
Green - pin 51 (signals top motor to lower), blue wire (one of several, be careful)
Red - pin 47 (power) red and purple wire
Black - pin 10 (ground) black and brown wire
Really, programming the TR7 was trickier. As for having a spare, sorry, I took them both apart and I'm using the spare to program the one for the car. I'm going for a more compact set-up than the original thread on E46fanatics creates.
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