Hmm, I would have thought it would have shut the lights off automatically. :hmm: I know theres been a time or two where I've been washing my car with the stereo on and when I got back in, it said "battery save on" or something, but the lights and radio still worked normally (and it started no problem). This was after about 45min or so of radio on/(head)lights off/engine off.tomm said:I left my interior lights on overnight and this morning the battery was dead and it would not start. The lights were still on dimly this morning when I noticed it. I thought the CTS has a power saving feature that would automatically cut power if the lights were left on? Is this a feature that needs to be manually turned on?