Re-coding Ignition Lock Cylinder to match original key

[ggeorgia]

Hey everyone, I looked around on older threads about this topic but didn't find anything that explored it in the detail I was looking for.

I replaced my ignition lock cylinder on my 2004 Tahoe awhile ago, but never got around to having it re-coded to match the original key (also used for the door lock and spare tire access). I've re-coded the lock cylinder on my driver's side door before and it was easy for the most part.

To start, I removed the ignition lock cylinder but am not sure how to properly disassemble the tumblers and springs. There seems to be some sort of retainer keeping them in place, but it isn't straightforward how to disassemble without possibly damaging it. Take a look at the high-res photos of the ignition lock cylinder I uploaded.

I really appreciate anyone's help with this. Thanks guys.

 

[Rocket Man]

Seems like an obvious reply, but is there a reason you can't have a locksmith do it?

 

[ggeorgia]

Just wanting to save a buck where I can (got laid off in January).

 

[Rocket Man]

Understood but if you break the cylinder you'll end up costing even more. Last locksmith re-keyed a cylinder for me for $15. At least ask one what he'd charge!

 

[ggeorgia]

I figure about $10-$20, but it's also the inconvenience.

Anyhow, I was researching it a bit further and pulled up the assembly diagram of the lock cylinder from a GM wholesale parts site (see below). It gives me a better idea on how to dismantle the retaining bar (item#3) which is necessary to access the tumblers and springs. I'm gonna attempt tomorrow.

I'll post some pictures if everything works out.

 

[Rocket Man]

Well...??? How'd it go?

 

[BlackOh7on22s]

Just use a pick to pull that plate up on the ends. Be careful not to just pry off cause there are the small springs under the plate. Once off just swap everything over to new cylinder

 

[fiatdale]

^ Exactly what he said. That metal retainer clip just pops out. Take it off slow so the springs don't fly everywhere. Move tumblers one at a time so they're in the correct order. We do this stuff all the time, its very easy.