For some reason the other day when I get out of my truck and got back in matter it was locked. The anti-theft code appeared on my stereo. My question is is there a easy way to get this code or do I have to find the Din removal tools and take the stereo out cuz I've heard it is the last four digits of the serial number on your stereo but I can't get to the stereo. I have a 2015 Volvo vnl 670 thanks...jerry