I'm also seeing some similar behaviour -
It seems that when first inserted into the car, the empeg has no knowedge of the tuner & it won't respond to the Sony stick.
When this occurs Hijack says that the empeg is in DC/CAR mode. If I remove & reinsert the empeg, then everything seems to work ok. I have also had this occur whilst it was installed in the car, where the sony stick was working fine at the start of the journey.
I'm using v2b7 and Hijack v151.
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RioCar 20 Gig Blue & Tuner