enable factory with ignition on honda

I found a post on here where a guy found a wire at the multiplex fuse panel on an 02 Odyseey that was Blue/White that went from 12v+ to ground when the ignition was on and he cut it and put a relay between the cut ends and fed 12v+ to one side of it to allow the factory remotes to work during remote start. Does anyone have any more info on this? I would like to do this on a couple Accords and another Odyssey if i could find the right wire without too much probing around. Thanks for any info.

Chris Luongo wrote:     I've done a bunch of those, as well as my mother's 2003......and thanks to this forum, I managed to get her factory keyless to stay working with the remote start running. Anyway, here's a basic wire-location shortcut list: --Ignition wires: Easy enough to find, in black tubing coming down the steering column. If you want the radio to remain off during remote start, don't make any connection to the WHITE/ black (or is it WHITE/ red?) accessory wire---it is not needed. --Parking lights and brake: There are several plugs at the fusebox. RED / black is positive lights; WHITE/ black is positive brake. While you're there, you can also zip-tie your programming switch to those harnesses-----it'll be easy to remember that you put the switch with the fuses. --Tachometer: Remove driver's kick panel. Tach is a blue wire, in a light blue plug down there. --Disarm-only: If you want to disarm the factory alarm WITHOUT unlocking the doors, you must find the blue wire INSIDE the driver's door. But that's the hard way. --Doorlocks: Passenger-side fusebox, just above the fuses. I always forget the wire colors but I'm sure you guys can find a tech sheet somewhere. Test these wires while turning the KEY in the passenger door, NOT by using the rocker switch on the door panel. These wires not only control the locks, but the arm/disarm the factory alarm, and they turn on the domelight when you unlock. --Disarm for remote start: Simple, as long as you bought good product with the right outputs. Connect a "pulse before start" output from your remote starter, to the car's unlock wire. Connect a "pulse after start" output from your remote starter, to the car's lock wire. So, here's how it works: When you hit the remote-start button, the car unlocks and disarms the alarm. As soon as the car starts, it re-locks. --Factory keyless with engine running: The factory keyless module is above the glovebox someplace. It's small, brown, and has the Omron brand name on it. It has just four wires. The yellow wire should be ignition. Interrupt this wire during remote start, the keyless will not "know" that the ignition is on, and the remotes will still work. .

The last 2 lines of Chris' post.