If your the moder type there is a hack out there where you solder a resistor onto the ground wire of an iPod power adapter and it causes your iPod to pause automatically when the car is turned off. (actually when the plug loses power) You still have to un-pause it when you get back in, but it's better then forgetting and leaving it playing for hours when you get out of the car.Then the remaining question is where to mount the dock. I sure wish the car would have come with better iPod support. I really miss being able to control my iPod from my stereo. Now I have to pause it when I turn my car off, start it manually, etc. It sucks.
Ummm...put a filter cap between the power rails, to fix the problem. Since you're an EE I'll let you calculate how small/large a filter cap you might needI have a suggestion. DO NOT BUY DLO. they're stuff is crap. i owned an fm transmitter/charger for my old car and it would have alot of noise. you could "hear" the rpms. Being as i'm an EE and think i'm all smart i assumed that the power going to the transmitter from the battery was chaging as you accelerated, and adding extra noise to the radio antenna.
So when i got this car and it had the AUX inputs i bought a DLO car dock that charged and also had a aux output so i would just have to hook up the ipod and disconnect it blah blah... Anyway had the same noise issue. the DLO products are shit and with some simpe google searches you can see everyone has these problems.