I have a 2005 Screw, what is the color or ID for the horn wire at the
bottom/firewall of the steering assembly? I do not want to poke around and fire off the airbag!!!!!

 

Dark Green w/ Orange stripe wire from PCM is switched to the Dark Blue wire.

This is the circuit that grounds the coil on the horn relay.

Dark Blue wire is also the same wire from the BSM / VSM - Horn_LSD_Out function.

 

that sounds great..except what is the "PCM" and what the ***is "BSM/VSM-horn_LSD_out ?

 

PCM = Powertrain Control Module

BSM = Body Security Module

VSM = Vehicle Security Module

Ford had a MY change on the BSM, and changed it to a VSM name to differentiate the modules. Same as the NOV-00 change for the RAP / CSM. Similar functions, not pin for pin swapable.

 

Hey, now that I understand, thank you for your help

 

Sorry forgot this in the post above

horn_LSD_out is the pin on the VSM that makes the truck horn the horn when you press lock or unlock 2 times on the key fob RKE. It is the confirm tone.