I get my AUTO WATCH alarm fited for $380. That guy spend 3hours analysis all the wires of the security and immoboliser, at last he successbully install a alarm unit and keep the key untouched.
What I got:
Untouched key, all funtions run as factory set.
Alarm system
windows sensers
A suprised funtion, when I click unlock bottom, the tail ligh will on for about 3 second, that is really cool as I seldom see what my car's tail light looks like.
As I understanding, He didn't upgrade the security level, he just put an AUTO Watch unit in between the factory security unit and control, so all the singal will go through the origional unit and then the AUTO Watch unit, then to the control unit. the senser and siren are link to the AUTO WATCH unit. In case if some thing wrong, either from factory code system or new senser, The siren will speak lond.
Pretty good.