Commodore VT Ignition

[RR99]

I have a COMMODORE VT C91 and need to bypass the ignition switch assembly. There are Four wires out, Purple (Starter) Red (Power) can anyone advise what the Brown and Pink are for and confirm that I am correct as to the Red and Prple ??

 

[lout]

car still wont start without immobilizer deactivated
no one will help a new user with such a question