Here are the diagrams for the Civic (30 pdf files)
Remove the pdf extention, then unzip the pdf files.
Note, the they are in French, I did translate the titles... (better then nothing).
Have fun
Cool things that are on my list:
-When mirrors are retracted make the mirror LED light on for visibility when parked
-Add a button to make backup camera on while driving ( use defrost button to turn on camera for 30 sec.)
-Make coming home light ( turn headlight ON for 1min. after pressing twice lock or unlock)
-There are (undocumented in manual) extra 5W bulbs in the front cornering lights, use them as positioning light, like in US.
-Stroboscopic center stoplight ( first 2 seconds the LED’s from the Stop flashes 3-4 times, then go steady) this results in a very safe Stop sing for drivers behind you (I installed this on all my previous cars with LED stoplight)