Adding a remote start to my mom's Accord. Don't have a FSM handy, (no point for just this) and the local dealers are closed. I need the physical location of the factory alarm "brain". A tip/ring of the horn trigger would be nice, but I can figure that out with my DMM.

 

it's in one of the BCM units not removeble you have to disable or disarm the factory alarm and the immobilizer for remote start this is no amature install as this car is a data-bus system and one wrong wire or test point can mess up somthing.

 

Hey, congratulations on answering everything I didn't ask. (1.) I know how to disarm the factory alarm and (2.) already have a Honda-SL3 bypass module from iFAR.

I wanted to know where the factory alarm module was so I could use the horn trigger to activate the remote start. I've already probed the steering column harness and found the horn circuit (green/yellow). Unfortunately, it is a separate circuit unaffected by the factory keyless double tap of the lock button. The horn chirps when you hit the lock button twice for those that don't already know.

I'm pretty sure the FASD wire in the door will lead me to the keyless module.

 

like I said its in the BCM module (box behind the fusebox) Ex as for Lx theres no factory alarm just keyless and dealer installed option.