I somewhat agree.

 

I have worked in GM parts for 30 years, and if you have a key cut by the VIN at a dealer, they pull the codes from GM. If the ignition has been replaced or anything has changed with the VATS system, there is no update to the GM system for that VIN. GM only keeps the original codes and never changes or updates it.

 

I was told when I bought my 2002 if I lost one key it could be replaced. But if I lost both keys the lock would also need to be replaced and would cost over $1200.00 but I am not sure this source was correct.

 

That is incorrect.

 

Kind of figured that. I took the message not to loose both keys it would be bad, and I guess the general message was true.

 

I would go to the dealer and replace it again 1200 bucks !

 

 

Wow, the number of crap suggestions given in this thread are impressive. Taking the BCM to the dealer to match the key number, reprogram the BCM with the key number, jumping the TDR, trying every resistance value until one works, pulling the car apart to get to the VATS wiring, .....

It took 33 posts to get the correct answer and it's rather simple. Will take about 40 minutes and all you have to do is use your phone for a stop watch and turn the key on and off. It's the VATS relearn as documented in the pdf Bill posted. You may want to connect a charger or maintainer while doing it to keep the battery voltage from dropping.

1. Turn ON the ignition leaving the engine OFF for 11 minutes.
2. Turn OFF the ignition for 30 seconds.
3. Turn ON the ignition leaving the engine OFF for 11 minutes.
4. Turn OFF the ignition for 30 seconds.
5. Turn ON the ignition leaving the engine OFF for 11 minutes or until DTC P1630 sets.
6. Turn OFF the ignition for 30 seconds
7. Turn ON the ignition leaving the engine OFF and wait 30 seconds.
8. Attempt to start the engine.

At least the OP can be driving his car this weekend.

 

33 post ? The short answer was given on post #12 about relearning it through the DIC ! Which indicates a relearn sequence had to take place but rather then argue with peoples bs ! I dunno why people make simpleton stuff complicated!

 

Future

 

That answer was NOT for the VATS so it was wrong. Answer was still finally posted in #33 first.

 

Thanks lionel for breaking down the relearn sequence ! Although with a bit of google search it’s was listed in 12 just not explained as you did thanks! Hopefully the OP is driving now !

 

Saying to use the DIC to do a relearn is wrong and not the answer and it's rather pathetic you keep insisting it is. The DIC is used to match a keyfob to the car. The DIC can not be used to match a new VATS resistor in the key to the car.

 

The mentioned a relearn process you fail to even acknowledge it was there have a good 1 !

Btw the relearn sequence is through the dic and memory modules connected it shows just how much you know about the car as a whole !

 

No, Your post said to use the DIC and the VATS relearn does NOT use the DIC.

Your continued claims of using the DIC show you didn't have the answer back then and don't have it now.

So, quit posting it is the answer and confusing people who search this topic in the future.

 

My continued claim is they all sync or link up ! try cutting the wires in your ignition and tell me if your pcm or bcm shows on the Dic then come back and tell me again the have no connection ! You have clearly spun a gear ! Yes you provided the actual sequence . And ( Thank You )! Either way ur key will not program without the DIC relaying the information! Bs is thick today better put on the hip waiters !


Another thing Mr. Smarty ! Is your Dic obtains the code to even let this happen again u just know it all huh ?

 

OK, this is what the VATS does and which modules in the car are involved.

The Body Control Module (hereafter called the BCM) reads the resistance of the pellet in the ignition key.

The BCM uses the resistance value to calculate a digital security key that it then sends over the serial bus to the Powertrain Control Module (hereafter called the PCM).

When the PCM received the wrong digital security key, meaning the ignition key resistor pellet `doesn't match the one it has learned, then the PCM will not start the engine.

However, when the ignition is cycled as per the procedure, after the 3rd time the PCM goes into a relearn mode and will learn the new digital security key which makes the new ignition key resistor pellet value valid.

AT NO POINT DURING THIS PROCESS DOES THE DIC DO ANYTHING TO DO WITH THE VATS SECURITY SYSTEM.

I could disconnect the serial bus wire to the cluster so the DIC had no communications and the procedure would still work.

In fact, I could disconnect EVERY other module except the PCM and BCM from the serial bus and it would still work because NO other module is involved in the process.

The DIC is not the master module that relays and directs the information on the serial bus. It is far from that. It is just a simple display interface that reads data from the serial bus and displays it for the driver. It can fail or you can even rip it right out of the car and all the other electronics in the car would still function just fine.

I definitely know and understand the electronic systems in a C5 far better than you do. You also should avoid name calling superiority BS when you have absolutely no clue what you are talking about.

 

U should avoid telling people what to do with your Macho big red letters because I’m just not the one who is gonna be so submissive!

 

Anyways a hypertech PP2 or 3 has to be used therefore it’s plugs into the obd2! If your DIC isn’t it’s main message relay center why does it have your bcm errors and pcm errors ? Again sir your DIC plays more of a roll in this than many may think it all boils down to gm firmware I do t think your the one to have designed it and without the DIC in operation I believe one could not reprogram a key without it ! I would like to see a try and a key programmed without it being hooked up to the ignition,pcm and bcm ! Let me know how that goes for ya !