Air conditioning On, On2 Wire?

Vehicle : 1995 Nissan 240sx Alarm   : KCJS XT-V12 (remote start,pager,etc.type) Inside the install manual, it shows exactly as wriiten below. Thick blue wire: Air conditioning ON(ON2) Locating method: A thick wire at bottom of the key cylinder.This wire also has constant 12V output when key ON, 0 output when key ACC. Please find ON 1 wire first, then the other wire is ON 2. Connect it with the thick blue wire.(Jointed by soldering tin) Note : Some cars require to connect the air condtioning wire to ACC. If so, you need a diode to connect between ON and ACC. ~~My question is, my car has only one ON wire, so i didnt install this ON2 wire.(The alarm didnt have a wire listed as ACC wire.) The alarm will not enter remote-pager learning routine mode. I re-checked all connections with multimeter so im thinking its because i didnt install this ON2 wire. Do i connect this wire to ACC like guide says? IF so which way do i face the diode and what size? Should this allow the alarm to enter remote-pager learning routine? Please let me know your own opinion, even if someone else posted your idea already. I would feel better getting as many replies as possible.

I forgot to mention that it has the usual IGN-ON wire. Which i hooked up as usual. Its just that it has this second ON-2 wire, instead of an accesory wire, which confuses me so bad because my car doesnt have a second ignition wire. So how do i correctly hook this ON-2 wire up with a diode to accesory as the manual suggests, which way should the diode face and what size.