Mine Wakes Up.
Start engine, PDA on, PDA connects to Banks Device. Leave PDA on, shut off engine, short wait then PDA goes to sleep. Start engine PDA wakes up on its own. I have even had it remind me (much to my surprise) of a calendar even when I sync to Outlook and start the engine several days later.
Has the PDA had enough time to charge itself? It takes a little while. I do not remember any setting to actuate the wake up.
I like mine and the features, wait till you get to bail yourself out with the OBDII scan.
HNY