Anti-theft is on how do I reset it?

Okay, I did some checking and everything is showing the need for a scan tool. Here is what I suggest: Disconnect the battery, remove the module, keep it out for at least 10 minutes, and start over. See if having it disconnected allows you to get things to reset.

If you want the relearn procedures, please let me know.

Joe

Absolutely. Here is what I am showing:

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2007 Chevrolet Impala V6-3.5L
Programming Theft Deterrent System Components - Immobilizer
Vehicle Accessories and Optional Equipment Anti-theft and Alarm Systems Testing and Inspection Programming and Relearning Programming Theft Deterrent System Components - Immobilizer
PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS - IMMOBILIZER
Programming Immobilizer System Components

10-Minute Immobilizer Relearn

This 10-minute relearn procedure will relearn the prerelease password and the challenge/response data between the theft deterrent module (TDM) and the engine control module (ECM).

1. Connect a scan tool to the vehicle.
2. Turn ON the ignition, with the engine OFF.
3. Ensure that all power consuming devices are turned OFF on the vehicle.
4. With a scan tool, select Request Info. Under Service Programming System and follow the scan tool on-screen instructions.
5. Disconnect the scan tool from the vehicle and connect the scan tool to a Techline Terminal with the current Service Programming System (SPS) software.
6. On the Techline Terminal, select Service Programming System and follow the Techline Terminal on-screen instructions. Ensure the correct programming selection is chose based on component being replaced or programmed. For this procedure, go to the V.T.D. Vehicle Theft Deterrent Learn menu and choose the Vehicle Theft Deterrent Learn, ECM, or PK3 Replaced selection.
7. Disconnect the scan tool from the Techline Terminal and reconnect the scan tool to the vehicle.
8. With a master vehicle key, turn ON the ignition with the engine OFF.
9. With a scan tool, select Program ECU under Service Programming System.
10. At this point the scan tool must remain connected for the duration of the 10-minute relearn procedure.

Important:
* The scan tool will initially display 12 Minutes. The first 2 minutes allow the scan tool to initialize the appropriate control module. The remaining 10 minutes is the relearn timer.

* On some vehicles the security indicator may be illuminated for the duration of the 10-minute relearn procedure.

Observe the scan tool, after approximately 10 minutes the scan tool will display "Programming Successful, Turn OFF Ignition". The vehicle is now ready to relearn the key information and/or the passwords on the next ignition switch transition from OFF to CRANK.

11. Turn OFF the ignition and wait 2 minutes.
12. With a master vehicle key, turn the ignition to the RUN position for 15 seconds, then start the vehicle. The TDM and ECM have now relearned the pre-release password and the challenge/response data.
13. With a scan tool, clear any DTCs.

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Let me know if that helps.

Joe

Hi,

The only thing I have for testing is for the immobilizer. Here are those directions: Note that it indicates a diagnostic trouble code, B3976. A basic scan tool is not likely to read such codes.

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2007 Chevrolet Impala V6-3.5L
Immobilizer
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection B Code Charts B3976 Immobilizer
IMMOBILIZER
DTC B3976

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Vehicle > Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B3976 46
- Unconfigured Transponder/Vehicle Configuration Not Programmed

Circuit/System Description

When the theft deterrent module (TDM) is in the learn coded key state, the TDM checks the current key to ensure it has been configured as a proper vehicle key.

Conditions for Running the DTC

* Ignition is in the Accessory or Run position.
* The TDM is in the learn coded key state.

Conditions for Setting the DTC

The TDM has determined the current key is not configured as a proper vehicle key.

Action Taken When the DTC Sets

* The security indicator will be illuminated.
* Vehicle starting will be disabled.

Conditions for Clearing the DTC

* A current DTC will be cleared when the TDM detects a properly configured vehicle key.
* A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

Circuit/System Verification

Important: When using this diagnostic, more than one vehicle key is required to ensure proper diagnosis. If more than one key is not available at the time of service, contact the customer and ask if any other keys can be provided for service. If unavailable, a new second key can be created.

While viewing DTCs with a scan tool, attempt to start the vehicle using all of the available keys. The vehicle should start with all available keys.

If any key results in inoperative starting and DTC B3976 is set as current, replace the suspect key.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests

Replacing Keys

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Let me know if I can help.

Take care,
Joe

Hi,

I went through everything I could find relevant to the module and nothing is providing that information.

I'm sorry about that.

Joe

B3031 is the code that says the system is in the key learning mode. It sounds like you had the module in learn mode when the battery failed. Then putting in the new battery didn't change that. From the description I would have a dealer or shop try to re-flash the programming in the module and then program in the keys. As the battery went flat while you were in the learning mode and you replaced it that may have been the reason why it suddenly started acting strange in the first place, newer cars are very touchy about the battery condition and voltage.

You will need to use a dealer level scan tool and the access to GM to make all of the system operate. The 30 minute relearn only works when everything is already initialized and working and you only add a key or change the cylinder. As you have replaced multiple parts that all need to be programmed to work together, the scan tool is the only real option. No DIY way around that. Same routine on all makes and models these days, with some being far worse.