On older radios there was an option to set a max power on volume. But I haven't seen this on the RNS-E so far (OK, I haven't really looked for it either). If you turn the unit off with the volume being at, let's say 10, it will still be at 10 when you come back. I don't think this has to do with the Bose pin which should only affect GALA/AudioPilot.
it may not apply to the DVD sys, but on the CD one, you cand set the volume at which the music plays everytime the car is turned on... so no matter what you had it set prior to shutting the car off, it will reset itself to whatever the default is when the system is turned back on again...
I guess the RNS-E does not have a max power on volume setting. I had a quick look at the setup option and all I have is Navi and TMC volume. the US unit may even only have Navi volume (no TMC there). I didn't wait long enough for the RNS-E to completely power off but I left the car with the volume turned all the way down.
Mine too but I guess I didn't wait long enough. I was waiting about 10 minutes and when I came back, I didn't see the startup screen (which basically means that it didn't turn off completely). I will check this over the next couple of days. I guess I have never noticed because I neither have it very loud nor completely off when I lock the car.