1995 Lumina ingniton key

caffeinatedman4

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I have a 1995 Lumina with the ignition key that has a chip inside. I only have 2 keys. One of them won't turn the car over but you can turn the ignition switch. The other one works 90% of the time but doesn't always so I get stuck when that happens. Can I swap the ignition for one that doesnt require the chip keys?
 

zora

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You can't use a different key. You would have to find one of the threads online that details how to override your security system, Pass-Key II.
 

caffeinatedman4

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I went to the locksmith this morning to copy some other keys. I got him to test key that won't start the car. He said the chip is still good inside and told me that it's probably something in the switch why the keys don't work right.
 

zora

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Did he test both keys to see if they had the same reading?
 

caffeinatedman4

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I only brought the one key in. He told me to bring them both in to check for the same reading but that since the other one doesn't work sometimes its probably something to do with the switch.
 

zora

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If they both are the same reading and good that will confirm it's the switch.
 
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It's not actually a chip in the key, it's a resistor. There are two contacts in the key lock cylinder that make contact with the key and the security system reads the resistance. We had issues with the contacts in the lock cylinder on my wife's '96 Lumina Sedan (508, 000 miles). Instead of changing the lock cylinder I followed the wires for the contacts to a connector just to the right of the panel under the steering column. I measured the resistance of the keys and then got a resistor of the same value from the local electronics store. I unplugged the connector and placed the resistor across the security system connector contacts. Problem solved. No more issues with the security system not reading the key. Of course now any key that is cut correctly will start the car because the security system always sees the correct resistance on those wires.
 
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