Question about 2000 Cadillac Eldorado

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Cad. eldorado 2000 won't recognize key. i've cleaned the key, still nothing. i have tried all day and i can't get it to start

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First thing to do is read the system and post any codes that it is giving. That aside this vehicle uses the simple Passkey2 system. There is a pellet in the key that is actually a resistor. That pellet contacts with a circuit in the ignition key cylinder and is read by the BCM. You say you cleaned it up, was it giving you problems before this and you felt like after you cleaned it up made it work? If you have a simple multimeter, the first thing to do is to put it on resistance(OHMS) and place the leads on both sides of the pellet. Place it on the highest scale if it is not an auto ranging meter. You should get some type of reading other than zero if it is good. Be sure to place it on something flat or make sure that your fingers aren't touching the pellet as you can get a false reading. If it gives a reading then visually inspect the pellet in the key. Is it worn, if you hold it up sideways are both sides equally sticking out of the key. If not, it will intermittently fail. Push on the pellet to see if you can move it out of the key. If it moves, its time to get a new key and relearn the system. If it doesn't move your cylinder may be worn. Wiggle the key, is there a lot of play. OH BTW if you can pull the key out of the ignition with the ignition on, don't waste time just replace the key and cylinder. There is of course an inexpensive method to override the Passkey2 system, by simply replacing the pellet in the ignition with a resistor within 15%+- of the value read by the meter. This is accomplished by splicing that resistor parallel across the wires coming from the ignition cylinder for the pellet thats purple/white and white//black. There are other things you can check as well such as the start inhibit circuit, but that is outside of the scope of my response without some additional info

Posted on Mar 28, 2011

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