It has been incredibly humid in northeast Ohio lately, which means if you're driving you either need functional air conditioning, or functional windows. My mother's van had neither and she's been going crazy. Tried filling her A/C with coolant but it must be leaking. Not something we can't easily fix ourselves. The windows, however, are electric. The switches on the driver's side ("Express Down Module") stopped working. None of the junkyards around here seem to have the part, which is surprising since that exact module is used in tons of cars. My mother, nor I, could afford a new one, either. Hooray economy, etc.
Wait... switches? Pfft, simple. I could do that. Anyone on this forum could. Except, I didn't have the proper parts. None of my switches are rated for such high voltage/amperage. But I had to try, right? It didn't need to be permanent. Just something simple until we get the part. This is the first incarnation (yes my keyboard is dirty as Heck):
You all know what was going to happen, right? I thought, maybe, if we only used it while the engine was off, but the key was turned, it might survive (no alternator pumping our tons of amps). First time I tried it, *SNAP* there went the buttons. Oh well. It was worth a shot. So, I called my father. He's the mechanic at a metal processing place (mainly huge slabs of steel). Fixes heavy machinery and anything else that breaks. He's swiped me parts from his work in the past, but normally his components are total overkill for anything I'd need. However, in this case I needed the big guns. The only switches he had that would fit my use were some momentary SPDT
like this, only bigger. I took three of them. I only needed two, but, hey, I like big switches. Then I ended up realizing I could make use of it in this. The Autozone schematic was wrong as far as wire colors. I ended up tracking down a dirt cheap used Haynes manual for the van. Here's the wiring diagram I made while doing this, based on the wire colors of the connector:
By using the third switch, my mother could then control the passenger window as well (like the original switch could). The only thing it couldn't do that the original could, is the "express down" feature where you hit the button once and it automatically lowers the driverside window all the way. Meh. The other disadvantage is it sort of requires two hands to use. As it is now, there are three switches in a row. The one on the left (as it is in the car, not in the diagram) controls which window you're using. For the other two, move both forward to roll the window up, and both backward to roll the window down. Simple enough.
I'm afraid I don't have a picture of the finished product yet. It got dark before I could get one.