Theft deterrent module is different from BCM as far as I know.

 

My mechanic let me try his spare BCM the junk yard borrowed him, when I connected it, I got the security light and I could not start my Cobalt. He even told me this before I tried. He said, the Key pass code (thingy, whatever it is) is passed through the BCM, then passed on to the ECM, where the final part is in the ECM where it allows the voltage to be sent to the starter.

Do you think you could browse the server for such a procedure?

I know one exists, seen it myself, but that was a long time ago.

Thanks in advance

 

The procedure you described is for TDM programming if you replace module or key. This procedure has nothing to do with BCM. BCM reprogramming is done with Tech2

 

The TDM been the part which reads the key?

Or the cylinder part in the center of that image?

When they did this, they didn't touch my cylinder at all, nor replace any parts.
(I know because they bent up the key insert hole, its still there. Also, they said the $700 was pure labor.

 

The part that says TDM is the TDM and that is what reads the key.

 

I'm not sure if that was replaced or not, the cylinder itself was not replaced, they didn't tell me they replaced any parts, didn't charge me either.

Anywho, what is the procedure anyway?

 

Anywho, what is the procedure anyway?

For? TDM or BCM

 

Hmm,

Both would be nice, lol (Since we're talking about ECM, that would be best, however security light comes on with new ECM, to the TDM may be helpful too)

A copy / paste job would be fine, its good to know for any Cobalt owner

 

It would take too much of my time to list all procedures plus unless you have a Tech2 and know how to use it, it is useless anyway. The manual for the Tech2 has 628 pages. I have it in pdf. Different years, even Canadian cars have different procedures. Cars within the same year have different procedures. Not to mention models with SC or TC.

 

Okay, that's cool, don't bother with the BCM.

How about just the TDM then?

 

Is your VIN the one ending in 3338? You still need a Tech 2 for the TDM.

 

Yes 3338 is mine.

I didn't actually see the successful re-learn at the dealership, but the little peek I saw said something about just turning the key on a few times for certain amount of times.

But the above, I never saw success, maybe the dealer did use another method to reset the TDM, I don't actually know for sure.

I will get the information on the other Cobalt and post back its VIN so we can see if we can come up with a solution.

Thanks Coby.