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Is the security light on or flashing ? The yellow wire goes from the key switch to the neutral safety switch, then to the starter. So bypassing the neutral safety would make the starter crank the engine, but would have nothing to do with the rest of the engine.
could be the neutral switch try and crank it while moving the shifter around also try and put power to the small terminal on the starter that will tell you if the starter is bad or the wiring or switches
It sounds like you have an issue with your PassLock security system. I had the same with my 2002 Impala. Key turns OK, but won't start, won't crank. Wait 20-30 minutes, and car starts normally. There is usually a clue from the Battery and Security lights.
The problem starting to happen once a month, and eventually 1-2 times a week.
There are several write-ups on this problem for several GM cars for 2000-2006(?). Search this website, and search the web.
The official solution is to replace the ignition switch. The best solution is to bypass the Pass Lock system. I went ahead and did a full bypass, which involves cutting wires and adding resistors to the ignition circuit. I have not had a problem since.
usually when u replace that you need to relearn the security system for it to start,,,,try to turn the key till the starter hits then release and leave it in the run position for 10 minutes,then turn the key off for 30 seconds and then repat this 3 times and then after the last time turn the key off for 2 minutes and then try to start it,,thats the manual way to relearn the key abd lock,,if that dont wokr take it to the dealer
Does a light come on that looks like a lock?? This is GMs Passlock problem. It a fault in the ignition cylinder. The car won`t turn over. If you remove the key, the car will start in 8 to 10 minutes. Some have found that spraying an electronic spray or silicone based spray in the ignition and rapidly turning the key back and forth may help. Repeat this several times. Replacing the ignition switch is an expensive option, but may have to be done.