As the prescribed method isn't working it would seem likely the antitheft system is broken and should be checked by a professional.
Electronics aren't bulletproof and at over 20 years old the ones fitted to your car are 20 years less robust and 20 years less sophisticated and easily damaged by such things as welding, battery charging, jump starting or even nearby lightning strikes. Such instances often do not cause obvious damage immediately but rather have a weakening effect so the final breakdown happens later, maybe years later.
SOURCE: anti theft 1997 malibu
most are 4 ohm can be checked by putting a resistor in the wire and if the car starts thats the right resistance if 4 ohm dont try a variety os sizes until it does
SOURCE: 94 Cadillac DeVille: Car would only run for 20
When the car has the crank/no start, at that point see which is missing. Test for fuel and spark. I think it has to do with fuel, a tired fuel pump or relay. But remember to check the oil sending unit. If it fails it will shut down the fuel system.
SOURCE: 94 cadillac deville.. car will not start because
Try setting the alarm ,and make sure the hood doors and trunk are closed,after setting the antitheft,leave it for 1 minute and disarm it,then see if it will start,if it is not the antitheft,and it is in the key fob,the cylinder you are talking about maybe the problem.
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