2000 yukon denali, factory disarm

Trying to locate the factory disarm wire in a 2000 GMC Denali. Owner says every once and a while the horn will start honking after unlocking. Where is the factory disarm wire for this vehicle Thanks

lt. green       -       pin B3, purple plug at BCM      

The factory alarm will disarm when the ignition is energized by the remote start.

there is no purple plug at the bcm, also it only does it when unlocking, remote starting is fine, no alarm goes off

At the bcm, under the steering column......plug to the far right.

there is no bcm under the steering column. It is located in the middle center console but there is not purple plug. I tested most of the wires and none of them trigger negtive when I unlock the doors? Also there is no disarm wire in the kick panel. Do anyone know where to locate this wire, or a bypass that will use the databus to factory disarm?

a 2000 denali is like a 2000 escalade wire up a relay to pulse 12v on to the brown 2nd Acc wire at the steering columun and you are done.