help same problem
ok so this thread is ancient but o/ps question wasnt really answered i have a vy ute i have taken my ute into holden and had my rears enabled they might tell you in cant be done but actually what there saying is they dont know how to you need to tell them:
To program the code index have your dealer refer to Techline march 2003
It says "To program the code index refer to PV SIP Section 12D/Entertainment System/3.11 Program/F0rogram Code Index. Change the head units code index from ute (06) to sedan (01) , or from (09) to (10) using the Tech2. This will enable the rear amps
and yes you will need to supply your own speakers surely in a ute surrounding speakers would sound better that stereo besides where else to get bass in a ute other than 6x9's my question is, is there wires there for rear speakers that i can connect to or do i need some sort of new loom thing