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Won't start after ignition lock cylinder replacement and relearn

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jd.hupp

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Someone tried to steal my '01 Cavalier LS by breaking off the outside of the ignition lock cylinder on the steering column and then jimmying the key slot with a screwdriver. That didn't work for them, but it did disable the car.

I could insert the key, though it was somewhat rough, but could not turn it.

Since I couldn't turn the key to the Run position, I drilled out the cylinder lock button, pulled the lock cylinder, and replaced it with a used cylinder from eBay.

Question #1: I borrowed a copy of the factory service manual, and it says to rotate the key 5 degrees counter-clockwise while inserting the replacement ignition lock cylinder. That made no sense to me, so perhaps someone can explain it.

My starting position was that the ignition actuator was still in the Off position because that's where the no-key procedure leaves it when you pull out the drilled cylinder. But to insert the new cylinder, you have to turn the new key to the Run position to get the lock button to drop. Therefore the actuator has to be rotated into the Run position so the cylinder can slide all the way in. This I did, but the 5-degrees thing is still a mystery. Maybe it's important and I don't know why.

Question #2: I expected to have to do the 10-minute relearn procedure, or maybe the 30-minute relearn procedure, both of which I think can be done without a factory scan tool. But I have done at least 6 cycles of the 10-minute process. The car will crank and occasionally fire for a 1-2 seconds before stalling.

From what I have read, this seems to indicate that the BCM is not receiving a Passlock signal voltage that it likes. So maybe the relearn procedure didn't work, or something more is broken, or the replacement lock cylinder is defective, or .....??

I borrowed an OTC OBD II scanner from Autozone ($150 deposit), which reported no DTC's. I had hoped that it might report some parameters like Passlock Data Voltage and a couple other Passlock parameters, but no success with that.

I can also borrow a Actron CP9190 scanner from them for $500+ in the hope that it might give me better data. Anyone know if it might? (I suppose that's Q #3.)
 
is the security light on either constant or flashing?
 
1. Have you done a fuel pressure test?
2. Have you tested for spark at the plugs?
3. The security light should be on if you have a passlock issue.
4. Since you have a used cylinder and switch, the switch could be bad.
 
1. Have you done a fuel pressure test?
2. Have you tested for spark at the plugs?
3. The security light should be on if you have a passlock issue.
4. Since you have a used cylinder and switch, the switch could be bad.

Since this problem arose from malicious damage at the ignition lock (and nowhere else as far as I know), I have not been troubleshooting it as one might a general cranks-but-doesn't-fire problem.

So (1) No and (2) No.

A good point with (3) and might tell me something after I think about it more.

I did not replace the switch (4), just the ignition lock cylinder and key (seen at #34 in http://www.wholesalegmpartsonline.com/showAssembly.aspx?ukey_assembly=385568&ukey_make=1024&ukey_model=14493&modelYear=2001&ukey_category=19570&ukey_driveLine=11475&ukey_trimLevel=25649).
 
according to this article you need a scan tool to program the new cylinder
http://ricksfreeautorepairadvice.com/gm-anti-theft-systems-overview/

Thanks. That's what the factory manual also says for the 10-minute relearn, but not for the 30-minute relearn. It's not clear when either/both are required, and I have read other sources that don't say that a programming scan tool is required for the 10-minute relearn.

If it is required, that could explain the behavior I'm seeing.

Right now, I'm going to try to salvage the outer cylinder lock case from the butchered original. That will contain the original Hall Effect sensor, and if the case is usable, maybe I can just slide in the new cylinder core and get it to start.
 
That worked!

Though I had done some damage to the cylinder case when I was drilling out the lock button, it cleaned up well enough with a little grinding/sanding. Then I swapped in the cylinder core and a couple other small parts, installed, and started the car!

Now all I have to do (all?) is rekey/recode the cylinder so I can use my original keys for everything instead of having one set for ignition, another for doors and trunk.

Thanks for engaging with me on this.
 
glad you got it solved, appears that it did need a more involved programming to work with the new sensor
 
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