Here is the wiring codes for a 2000 civic. Tried to make it as easy to read as possible if you have any questions feel free to ask.
12volts white + ignition harness
Starter black/white + ignition harness or
Notes: In 6 pin white plug behind fuse box
Ignition black/yellow + ignition harness
Second Ignition yellow + ignition harness
Accessory white/black + ignition harness
Power Lock green/white - keyless entry module
Notes: The keyless entry module is white in color, and located in the drivers kick panel.
Power Unlock green/orange - keyless entry module
Notes: The keyless entry module is white in color, and located in the drivers kick panel.
Lock Motor white/red drivers kick panel
Unlock Motor blue/red drivers kick panel
Parking Lights+ red/black keyless entry module
Notes: The keyless entry module is white in color, and located in the drivers kick panel.
Door Trigger lt. green/red - OEM alarm plug
Notes: The OEM alarm plug is to the right side of the steering column. The plug is green.
Dome Supervision same as doors
Trunk/Hatch Pin blue/black - OEM alarm plug
Notes: The OEM alarm plug is to the right side of the steering column. The plug is green.
Tachometer blue test connector
Notes: Drivers side fire wall under hood in a 2 pin plug
Brake Wire green/white + brake switch
Horn Trigger gray - OEM alarm plug
Notes: The OEM alarm plug is to the right side of the steering column. The plug is green.