Sorry I'm not around my service manual, but will be in a couple days. If the 08 is similar, if not the exact same as the '10, I should be able to tell ya.
I know off the top of my head, when looking down at the EHC, there is an amber light that comes on with the key, and when running there is a blinking green light. Sorry I've never matched them in the service book yet..
Holler if you still need some help.