'08 Cruise control not working

[OhSevenOhSix]

First time poster, be gentle please

I have an australian '08 model Yaris, and have just tried to install a Rostra cruise control, unfortunately it does not seem to want to work.

After some research I quickly found that it was not possible to do the easy install on the australian model of Yaris, by just adding the control stalk. I took the chance on the ECM etc being roughly the same on the '07 and '08 models and bought a Rostra 250-1873 kit to fit an '06-'07 Yaris.

The install went smoothly with the wiring and connectors being the exactly the same as supplied, and pictured in the documentation.

Took it for a test drive, light comes on, but acc/decel does not work.

Anybody got an idea whether the 06-07 Rostra CC should work on the '08 model car? Are there any known differences between the ECM's on the 06/07 and 08 cars? Any other advice (constructive) will be appreciated.

TIA

Regards, Graeme