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Old 01-23-2008, 12:20 PM
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PCM Security Relearn Procedure

Powertrain Control Module Security Relearn Procedure

On some vehicles (Bonneville, Regal, Impala SS, Monte Carlo SS, and 2004+ Grand Prix) it will be necessary to perform this Security Relearn Procedure before the car can be started. No tools are required to complete this procedure and it can be accomplished 30 to 45 minutes after the PCM is initially installed. You must complete the procedure without opening any of the vehicle doors or trunk. It's best to open the drivers window and reach inside the vehicle to complete the learn procedure.

For Bonneville, Regal, Impala, and Monte Carlo vehicles 1997-2004 and Cobalt, ION 2004-2006:


1. Set the parking brake to disable the daytime running lights system to avoid draining the vehicles battery.

2. Try to start the vehicle by turning the key to the START position (using a

3. Master Pass-Key key, not a Valet key). Allow the key to fall back into the ON position. DO NOT TURN THE KEY TO THE OFF POSITION.

4. Observe the SECURITY telltale on the dashboard or driver information center. After approximately ten minutes it should turn off for the first time.

5. Turn OFF the ignition and wait for ten seconds.

6. Try to start the vehicle by turning the key to the START position (using a Master Pass-Key key, not a Valet key). Allow the key to fall back into the ON position. DO NOT TURN THE KEY TO THE OFF POSITION.

7. Observe the SECURITY telltale on the dashboard or driver information center. After approximately ten minutes it should turn off for the first time.

8. Turn OFF the ignition and wait for ten seconds.

9.Try to start the vehicle by turning the key to the START position (using a Master Pass-Key key, not a Valet key). Allow the key to fall back into the ON position. DO NOT TURN THE KEY TO THE OFF POSITION.

10. Observe the SECURITY telltale on the dashboard or driver information center. After approximately ten minutes it should turn off for the first time.
Turn OFF the ignition and wait for ten seconds.

11. Start the vehicle.

For 2004 Grand Prix only:


1. Set the parking brake to disable the daytime running lights system to avoid draining the vehicles battery.

2. Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).

3. Observe the SECURITY telltale on the driver information center. Allow the key to fall back into the ON position. DO NOT TURN THE KEY TO THE OFF POSITION.

4. After no less than fifteen minutes turn OFF the ignition and wait for ten seconds.

5. Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).

6. Observe the SECURITY telltale on the driver information center. Allow the key to fall back into the ON position. DO NOT TURN THE KEY TO THE OFF POSITION.

7. After no less than fifteen minutes turn OFF the ignition and wait for ten seconds.

8. Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).

9. Observe the SECURITY telltale on the driver information center. Allow the key to fall back into the ON position. DO NOT TURN THE KEY TO THE OFF POSITION.

10. After no less than fifteen minutes turn OFF the ignition and wait for ten seconds.

11. Start the vehicle.


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Old 01-23-2008, 05:21 PM
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Something that may help.

A buddy has an 2004 Impala. The car uses the standard GM Message Center which is a dot matrix display capable of various colors to tell you of many things instead of a dedicated single light for each item. With key on the MC had a scrolling of battery, security, and change oil repeating. My friend couldn't originally get the pcm to learn because he expected the security light to stay on solidly. Being that it rolled, he wasn't sure what to expect. After ~10 minutes the MC rolled from battery to oil change and repeated without security. This is the security light going out for the first time.
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Old 01-23-2008, 09:22 PM
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Pcm

Brian,

Thanks for the procedure on the security learn for the 2004 GP, GTP. I am taking it that the Master Pass Key is the resistor key for the car and not just a cut key for it? After the security procedure is done, will there be anything else that I will need to do or should the on board accessories be found in the Security learn process? I am new to this PCM stuff so I want to be sure of what I am doing. Again the computer I am putting in the car is out of another GTP of the same year with the same Service # on it.

One last question," is the year and Service # all that is required off the computer, or should other number match from computer to computer to get the correct one?"
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Old 01-24-2008, 06:51 AM
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After a PCM change a CASE or crankshaft variation learn is recommended.
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Old 01-24-2008, 10:18 AM
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Pcm

Bill,

Quote:
"After a PCM change a CASE or crankshaft variation learn is recommended".
That is cool, Bill, but how is that done? I was thinking that the case learn would need to be done with the Tech2 GM scanner? Again I am new to the PCM area and I sure do not want to mess things up on the car. I am just getting the body work done now and I want to get it ready to do some modifications on it this spring.
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Old 01-25-2008, 06:57 AM
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A Tech 2 is one way. Many mechanics have scan tools capable, as well I've had AutoEnginuity and HP Tuners both have the ability.
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Old 01-25-2008, 10:00 PM
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Pcm

Thanks Bill,

I will check around, I know a couple of places that may have a scanner that will perform the case learn. I really do NOT want to take it to the dealership as they are just out of this world on prices and, well I am sure you know what I mean.

I am getting the PCM from a place that has the exact same year and model of the car that I have, with the same Service #. I have been pondering on just sending the PCM I am getting to Intense-Racing and just have them program the VIN# and everything into it.

The reason for my thought of sending in my PCM was due to the thought of a problem with a code coming up later on and having a scanner used. Will a scanner, Like a Tech2 even communicate with my PCM due to not having the proper VIN# programmed in it, or am I off base? Will the security and case learn procedure make the PCM compatible with a scanner? I know that the numbers on the outside of the PCM will not be correct, but will the internal memory be changed with the security procedure and case learn?

It is my honer to be here on this forum and be to be able to communicate with people like you Bill.
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Old 01-26-2008, 09:46 PM
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Easiest thing to do is find some locals on this and other forums that may case learn it for a couple beers.

On the Vin, you can have INTENSE program that into the new pcm when it's being done. You could have that new one sent to them so that you can keep your stocker intact in case you want to sell the car down the road and demod.
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Old 01-26-2008, 11:14 PM
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Sometimes you can find service tech's that aren't sticklers at the dealer. One of the dealers i go to, the service writer let his tech do the caselearn under the table, and I just paid him 20 bucks. It's a matter of knowing how and who to approach. Definately don't want to approach the managers LOL.
it's usually senior techs that know the procedure, the newer guys dont' have a clue in my experience searching for cheap case learns.
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