Hello guys, I have a 99 Chevy blazer. I'll try to make this short. I lost the keys. Got the new ignition switch stuck, drilled it out. Second one didn't work either so went straight to the ignition switch box to start it. It would turn over but only stay running for a few seconds and shut off. I went through every possible problematic option. Nothing, it would not stay running. ( I do believe the vehicle speed sensor needs replaced as well by the way.)
. 3 months later I bypassed the security system and it started right up!!!! Drove it around the block and down the road a bit, seemed just fine. Then I took off to go to work the next day and going down the high way everything seemed fine until I got up to about 60 mph and she just died, now back to the same thing. Now she won't start at all or stay running......... I know this is a bit of an odd situation but does anyone have any idea what I should do? I really need my vehicle! Please help!

 

The first part of this sounds like a passlock problem from extracting the ignition switch assembly. When you say you bypassed the security system what did you do, the resistor hack for the passlock module or something else?

So now are you back to the exact same behavior where it starts and runs for a few seconds and then dies? Is the security light on after it starts?

George

 

IIRC,the VATS key,there are only 15 different combinations. The code is stored in the computer. The resistor in the old key would be the one to measure for the bypass method.
Leighann,what do you mean by "got the new ignition switch stuck"? Do you mean the key cylinder?

You most likely will have to go to a dealer repair shop and with proof or ownership of the vehicle to let them reprogram the computer to accept a new key. Then you can do the VATS bypass with the replacement key resistor measured.

 

hi George, thank you for answering. So I got online and icut and spliced the yellow wire to the orange and black wire. Then I turned it on and off about 6 times I think(about 45) mins. Started right up. Now it isn't starting at all
yes the security light is on

 

Are you talking about the three wires that go from the passlock module to the BCM (trying to satisfy the unique resistor/voltage code for your truck) or three of the wires into and out of the ignition switch to hot wire the ignition and get the truck to start without a key? Has the ignition switch been removed or completely bypassed? Same question about the passlock module?


George

 

Hi George, thank you for your response, thank everyone. I'm not sure if I'm getting everyone's responses or not. I hope so and thank you so much! George I know it has been a while since I started this I just wanted to say that I forgot to add that after I bypassed the security system by splicing the correct wires and turning on and off, she started twice to just die on me on the highway and hasn't started since! I know that doesn't exactly answer your question but do you think this has anything to do with the BCM?

 

and oh I am talking about the wires coming from the 3 wires going to the bcm

 

I'm sorry George I feel like a fool on here only because it is difficult to navigate from my phone so it is making it difficult for you to understand I can imagine, looking back at my posts

 

Those two wires present a unique resistance/voltage value to the BCM. You either need to provide that exact resistor value on those two wires or put a random value on those two wires and force a BCM relearn. Did you include a resistor and if so what is its value?


George

 

no, no George I did not. I was unaware that I needed to. No one mentioned it in the video I watched and afteri spliced,ect, it started right up so I didn't particularly think I was missing a piece of the puzzle. So you think I need a resistor? I honestly don't know about this but I will learn.

So even though it still started you think that thus may still be the issue as to why it is currently not starting again? I trust you are more accurate with this information than i currently, so I shall learn of what resistance I need in my current situation. I'm looking forward to learning actually,

Thank you very much George, I will keep you updated on my progress. I appreciate your help!!! Leighann