I had the same problem with my 2007 XL7 (chime would not stop). The only fix was to disconnect the battery negative and then reconnect it. This fixed the problem. There were no codes when I checked with a scanner. To access the battery just slide the top section back 1 inch and lift off, then lift the battery cover off by pressing the two metal tabs behind the cover. To get the cover back on you will have to bang it with your fist to reposition the front part into place. Use a 10 mm wrench to disconnect the battery.
Monday, May 7th, 2018 AT 9:00 PM