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Find your fuse block, remove fuses 1 by 1 , replacing each that you find is ok with the original. (no need to replace a fuse that is still good) untill you find the blown fuse. Replace the blown fuse with a new one. A blown fuse looks like this:
ALL BLOWN FUSES WILL HAVE A BREAK IN THE MIDDLE SIMILAR TO WHAT IS SHOWN ABOVE. needle nose pliers works very well. This procedure will not take no more than a couple minutes.
Tire compressor probably draws too much current for the socket. Are you sure it is a cigarette lighter socket? Some sockets are just to provide accessories 12v. Did a cigarette lighter come with this socket? True cigarette lighter sockets are generally fused at 25 or 30 Amps
In earlier model vehicles, the cigarette lighter is on the same circuit as the dash lights/ radio/ interior lights. Maybe it's not labeled as cigarette lighter, try other fuses. also, there should be a fuse panel both inside dash and under the hood. Also, sometimes there can be an in-line fuse right behind the cigarette lighter.
Open Loop or Closed Loop has absolutely nothing to do with the computer's ability to output data to the scanner.
This may sound like a crazy question,but does your cigarette lighter socket work?
The Data Link Connector (DLC) on most GM vehicles gets their 12 volt supply from the same fuse as the cigarette lighter. It is real common for the cigarette lighter fuse to be blown. (due to a bad cell-phone charger, or any of the other thousands of accessories that can be plugged into the cigarette lighter.)
Your scanner cannot communicate with the onboard computer if this fuse is blown.
take them out one by one and check them until you find the one taht is blown. Most fuses have a wire between the terminals that is visible. If there is no wire connecting them its blown. If you cant see these get a continuity tester if it doesn't beep fuse is blown
Check the fuse in the car charger, and try in another car. The manual with should show where the fuse location. (because it worked befor you charged it,sounds like the car cord fuse is blown or the cord is defected)
This one's the fusebox in the interior of the car; usually below the steering wheel in a panel with a thumbscrew that you just give a quarter-turn, then catch it as it opens; inside are some fuses, which tend to be obvious when they are blown. There's a little legend that tends to be well-lit too, indicating which fuses were for the ligher/'auxillary 12v power' socket. Don't let a failed lighter bust on you; a flaming car is much more expensive than tossing/replacing the bad part or plugging something else in.