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Search for the "obd2 ecu pinout" should get you where you need to be. Don't know if you have 2a or 2b, so its kinda something you should be able to figure out dmac! Hope you are all fired up and done by now(late response by me apologies).
I've been doing some soul-searching about this crx project. Lot of school/ work and was taking out the dash wiring from the old 90hf the other day. All in all, the a/c controls are busted and I got pissed and broke them worse. I accidentally threw away the fan motor thinking it was trash...
My thoughts have been whether or not I should just buy a newer car because the crx is starting to look like a huge endless mess. All the interior plastic is sun-bleached dash is busted, front bumper is screwed up, rear center light busted, car is just generally looking very bad. But I made a decision that I will keep on the path unless I can pick up a newer 92-98 hatch, or crx in better condition locally.
I ordered the electrical troubleshooting manual for the 90 crx and will make it available in pdf format for others once I receive it since I haven't been able to find the complete manual online anywhere else. I also ordered the 96-98 civic etm and 92 etm just to make certain all my options are covered.
I am thinking I may put the 96-00 dash in the rex with airbag delete (tray in its place). This would require a bunch of custom fab work(and custom door panels), but I'm using 96+ fuseblock and gauges and a/c controls need changing also. In general I'm just getting pissed to the point of throwing caution to the wind and getting the project back on its feet. Wiring isn't whats holding me up anymore, its the car itself and I have a ton of hours to put in to make this the most awesome car that I intend it to be.
I'm siting here surrounded by underdash/ behind dash crx, civic harnesses/ fuseboxes /ecus. To anyone else it'd look like chaos. To me its right where I love to be.
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