I found some various info on the forum, but Id like to get some verification before I attempt this.
Im having intermittent problems where the car refuses to start with a flashing SECURITY light, then wait 10-15 mins and it starts. Definitely a pain, and always happens at bad times.
Here are a couple excerpts from certain posts.
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To disable the Passlock 1 or 2---- find the 3 (small 22 gauge) wires connected at the top of your Ignition Lock Cylinder-- Yellow(Key Reference),Black and White.(Wrapped in Black friction tape.) Start your car and cut the Yellow wire or just unplug the connector with all 3 wires. This breaks the Key Reference circuit while the engine is running. This puts the BCM into what GM calls "fail -enable" mode. Your Security/anti-theft light will come on and stay on continuously. Passlock is now Disabled until you reconnect the plug or Yellow wire. Tape up both ends of the yellow wire and don't ever reconnect. This doesn't even reset if you disconnect the battery. You'll get another couple of years out of the Ignition Lock Cylinder.
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And another:
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OK I've read the service manuals, and it sure seems doable. This should cure any problems with the antitheft kicking in and not allowing the car to start. This is also a far better way than installing a switch like so many have done on here before. Now, remember this is free advice so I'm not responsible for anything that may go wrong with you trying to do this....
You cut the RCode wire and wire a (PL2 acceptable) resistor across the the cut wire and the PL ground. A resistor that would be within the normal range for the passlock system this could be almost anything since there is a very broad range for this. When doing remote starters, I've seen these be anywhere from 1,000 to 56,000 ohms. Now this proceedure is how to replace and program a new cyl. lock yourselves without having to go to the dealer for them to "unlock" the system.
1. Attempt to start car; it will crank and fail, with the security light flashing. Leave the ignition on for 10 minutes, until the security light goes out.
2. Repeat step 1, two more times.
3. Car should now have learned its new key cylinder, or in this case, new resistor.
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With that said, I personally like the resistor idea because that way I wont have too have the dash lit up like a Christmas tree. Now I do have a couple questions:
1. Is the RCode wire mentioned in the 2nd quote the same yellow wire mentioned in the first quote?
2. What is a PL2 resistor? Is this available at an electronics store, such as Radioshack. Also what does it mean by PL ground? Would both ends of the cut yellow wire go into the resistor, or does it have its own ground? I know its not terribly difficult, I just dont do electronic stuff much haha.
3. Has anyone actually successfully done this before?
It just seems like a better option to spend 5 bucks and accomplish the same thing that a new 75 dollar ignition switch would.