"eliminate the obdII factory security system

[dwragon]

Hi all, I am seeking info on how to eliminate the obdII factory security system on a 97 3500HD I just bought. Bypassed the key to load it up by wedging a screw driver between the pin and lock plate. I know this can be done because I did it when I put an 95 OBDII LT1/T56 into my chevy Vega. To my memory, it was simply bypassing a modual and connecting wires, but that was 20 years ago. Anybody done the same or what do I have to do (NOT relearning a keys resistance.).

 

[dwragon]

NOT relearning a keys resistance.(Meaning I wasn't taking it to a dealership.)

Found this Passlock relearn procedure, will try it as it is simple to do, no cost, will let yall know.
Crank and let it shut itself off immediately.
Leave key in the run position for 10 minutes.
Turn key off for 10 seconds.
Crank truck again.
Complete a total of 3 times.

 

[618 Syndicate]

NOT relearning a keys resistance.(Meaning I wasn't taking it to a dealership.)

Found this Passlock relearn procedure, will try it as it is simple to do, no cost, will let yall know.
Crank and let it shut itself off immediately.
Leave key in the run position for 10 minutes.
Turn key off for 10 seconds.
Crank truck again.
Complete a total of 3 times.

This procedure doesn't eliminate the security, that has to be tuned out.

 

[df2x4]

To the best of my knowledge a '97 shouldn't even have PassLock, I thought that started in '98...

But as mentioned, if you want to truly disable the PassLock system and not just fool it into working, a PCM tune is necessary.

 

[HotWheelsBurban]

To the best of my knowledge a '97 shouldn't even have PassLock, I thought that started in '98...

But as mentioned, if you want to truly disable the PassLock system and not just fool it into working, a PCM tune is necessary.

Yup I tried all that stuff on the Burb 3 years ago. The only thing that actually kept working, was getting it"tuned" out. Expensive, but did the trick.

 

[AK49BWL]

97 doesn't have it.

 

[someotherguy]

I'll third it in case you're still not sure.. 1997 does not have factory antitheft. 1998 is first year for it. Triple check your VIN.. 10th digit "V" is 1997, "W" is 1998.

Richard

 

[dwragon]

it is a "V" vin, 97, so maybe i dont have to worry about it, got the new lock cylinder installed, going to go try to crank it after the battery install.

 

[dwragon]

cranks, no start, going to hook the Horror Fright OBDII up to see if it hints at anything else (fuel pumps pumping, no run with an air filter prime.)

 

[HotWheelsBurban]

Have you replaced the crankshaft position sensor yet? What about cap and rotor? Apologies if you have, and I didn't catch it. But on my Burb, when I had a "crank, no start" situation, those things fixed it. This was before the passlock went crazy though.