Rung Holden and no help, what a shock. I went to them a few weeks ago and asked if they knew where to buy E85 and they asked what it was...the service centre?
I can enable the rear speakers on a IQ no problems at all... located castle hill Sydney if interstate I can do it but require you to remove the headunit at this stage... in a month or 2 hopefully be able to post out a module to do it