I just purchased my tahoe last night (wednesday night) and I am trying to work the rear parking assist but it doesn't seem to work properly. When I put the truck in reverse the red light comes on and it does not beep and tell me when I am close to something. I've tried cleaning off the sensors and it still doesn't work. Also the button that turns it on and off won't turn off, i've pushed it quite a few times and still nothing. When I push it, it blinks three times and the light comes right back on, not sure what the problem is but since i paid for it, i'd like it to work. I would like to know if anyone else had this problem or knows how to fix it or if im just doing something wrong before i take it back to the dealership. also it doesn't sound like my rear speakers are working and i've checked all of the dials up front but the only time i hear sound from the rear speakers is when i turn the fade all the way to the back. Anyone know what might cause the speakers to not work?