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.

Wire/Function	Colour	Location/Description	Polarity
12 VOLTS	White	Ignition harness	+
IGNITION	BLACK/ red	Ignition harness	+
ACCESSORY	WHITE/ blue	Ignition harness	+
STARTER	BLACK / YELLOW	Ignition harness	+
STARTER 2	BLACK/ green	Ignition harness	+
KEY SENSE	BLACK/ pink	Ignition harness	+
TACH SIGNAL	GREEN/ blue	At coil on engine	AC

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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.