2003 Cavalier...BCM Problems??

I have a 2003 Cavalier with only about 34,000 miles on it...about a week ago, I was backing out of the drive and the car hesitated slightly and my service light, ABS light, and no trac light all came on...I shut the car off and restarted it and they went off. Just about every time I start the car now, the same lights come on. I took it to a body shop and they scanned it and said it was showing a few different codes...he asked me if I installed a chime module for the car when I changed my head unit in the dash to the after marked cd player and I told him I had...he said it may be wires crossing each other but he said it could also be the Body Control Module...I've had the cd player for over a year now and never had any problems...just wondering if anyone had similar problems or what you thought it might be...thanks!!

K

Find out what codes you have first, not the "body shop's" interpretation of them.