I just purchased my X920BT and got it professionally installed at a shop near where i live but for some reason, i cannot get it to change from day to night mode. I got it installed in my 2008 BMW 328xi which has auto headlight but i dont think it should be connected to the headlight. when i had the unit installed in my 07 subaru STi, which DIDNT have auto headlights, it went to day and night mode automatically without any problems. so, i know it's not the head light that will change this. can someone plese help me as to WHERE i need to hook up WHAT to have this navi go from day to night mode automatically. what should I tell the audio shop in order to fix this problem?