Electrical issues please help!!!
 

So I have a 2013 mini cooper r56. The other day I tried installing a kicker pt250 subwoofer i tapped into the left and right rear speakers and now my turn signals, windows, hazard lights, and those colorful interior lights are not working. Also my doors won't lock they will only unlock. I took the subwoofer out and still not working I put it on a scanner and got a code of p15e8. It still starts up I've checked all fuses inside and out and that's not the issue I have no clue what I did someone please help!!!!