Another angle - If I'm listening to radio/XM, place car in park, turn off AV with knob (leaving USB plugged in), turn off car . . . next time I start car, the radio/XM comes on by itself.
I'll try removing the USB and do a few checks and post back.
I wonder if your system is never fully turning OFF? When you first shut off the car, the Tech system stereo (and maybe the other units? Don't know, don't have one of those) goes to a standby mode rather than fully shutting down. This way the nav system can turn back on more quickly. After 10 to 20 minutes with the car parked and no activity, the stereo system fully powers OFF. Notice that if you use the key fob to unlock the car (after it has been parked for a while) but DON'T open the door for a moment, the stereo/nav has begun the wake-up cycle. I notice this when I'm walking out to the car after work and unlock it, open the trunk, and dump stuff in the trunk. By the time I'm seated and start the engine, the nav is pretty much fully ready. So any time the car gets a hint "driver is nearby or we may be going soon" the stereo/nav starts waking up.
If something is wrong elsewhere in your car, your stereo may be constantly triggered, never going from standby to full-OFF. Thus it's ready to "resume" whatever you were doing last.
I just did a quickie test in the garage. I didn't drive the Genesis at all today. The test was:
* unlock the doors with the key fob - two presses to unlock everything
* wait about half a minute...
* open the door and press START twice
The nav system wasn't quite ready but I got the nag screen immediately - no "Genesis" splash screen first.
* Once the map displayed, I turned on XM. Let it go a minute.
* shut off car without turning off the stereo
* opened the door (though I didn't get out of the car...)
* used the fob to lock the car
* sat there for another minute
* unlocked the car with the fob, then opened the door. Basically I simulated parking the car, leaving it for a minute to run into 7-11, and coming back.
* pushed START twice.
Results: XM woke up almost instantly... then the nav came up a bit later.
I left XM on again as I shut the car off and locked it with the fob. I'll go out there in half an hour or so... unlock it with the fob twice again, START twice, etc. and see what the stereo does.
Any chance the folks with "auto ON" stereos have also experienced the weak/dead batteries described in other posts? Some folks found their batteries depleted after the car was parked for just 2 or so days... mine has been parked for 3+ weeks at a time with no battery issues. Many of those cars had a missing rubber bumper on the underside of the hood: it should be on the driver side edge of the hood, it's about half an inch in diameter, black round thing, and it's located between the aft (windshield) edge of the hood and the larger (1 inch) rubber piece that supports the hood when closed. If the small rubber piece is missing the vehicle again assumes "somebody is nearby - stay awake and ready" which kills the battery... and perhaps keeps the stereo in the "standby" mode, ready to resume after your supposedly quick run into 7-11.
do-dah... do-dah... reading other genesisowners.com threads trying to kill half an hour before doing the second part of my test... will edit this post with the results...
Okay, it's been a while. I did the double-FOB unlock, waited a moment, opened the door and got in, pushed START twice, and sat there... "Genesis" splash screen displayed, then the nag screen. And then XM started on its own. ?? I left the stereo ON again as I shut the car off and re-locked it. I'll repeat the test in a couple of hours.
mike c.