Ugh, embarrasing. I hadn't driven the convertible in a while (winter weather and all) and found the battery to be dead this afternoon. I backed up the 318is to give a jump. I was in a hurry and managed to get the cables switched when hooking up the 318is battery. I noticed something was wrong when the convertible had no help starting, and then saw smoke coming from the cable's rubber handles. I quickly disconnected the cables and let everything cool down. I re-tried an hour later, and everything went fine. Except now the convertible is giving me an orange Anti Lock warning on the dash. I've never had this before. Related? Thanks for your input.