The immobilizer system in your 2007 Chevrolet Impala plays a crucial role in preventing theft. If you’ve replaced components or encountered issues, you might need to reprogram the system. This involves a 10-minute relearn procedure using an anti theft reset scan tool. This guide outlines the steps to program the Theft Deterrent System (TDS) using a compatible scan tool.
Understanding the Immobilizer Relearn Process
The 10-minute relearn procedure synchronizes the theft deterrent module (TDM) and the engine control module (ECM). This process establishes the necessary communication and security protocols between these modules, essentially teaching them to recognize each other again. A specialized anti theft reset scan tool is required to facilitate this communication and guide you through the process. This procedure involves relearning the pre-release password and challenge/response data, vital for proper vehicle operation and theft prevention.
Step-by-Step Programming Guide with an Anti Theft Reset Scan Tool
Preparation:
- Connect the Scan Tool: Connect your anti theft reset scan tool to the vehicle’s OBD-II port.
- Ignition ON, Engine OFF: Turn the ignition key to the ON position without starting the engine.
- Power Down Devices: Ensure all accessories (radio, lights, HVAC) are turned OFF to minimize power consumption.
Initiating the Relearn Procedure:
- Request Information: Using the scan tool, navigate to “Request Info” under the “Service Programming System” menu and follow the on-screen prompts.
- Connect to Techline Terminal: Disconnect the scan tool from the vehicle and connect it to a Techline Terminal equipped with the latest Service Programming System (SPS) software.
- Select Programming Option: On the Techline Terminal, select “Service Programming System.” Choose the appropriate programming option based on the component being replaced or programmed. For the immobilizer relearn, navigate to the “V.T.D. Vehicle Theft Deterrent Learn” menu and select “Vehicle Theft Deterrent Learn, ECM, or PK3 Replaced.”
- Reconnect to Vehicle: Disconnect from the Techline Terminal and reconnect the scan tool to the vehicle’s OBD-II port.
- Ignition ON with Master Key: Using a master vehicle key, turn the ignition ON without starting the engine.
- Program ECU: Select “Program ECU” under the “Service Programming System” menu on the scan tool.
10-Minute Relearn Process:
- Maintain Connection: The scan tool must remain connected throughout the entire 10-minute relearn process. The initial display might show 12 minutes, with the first 2 minutes allocated for module initialization. The security indicator light may illuminate during this procedure. Do not interrupt the process.
Completion and Verification:
- Programming Successful: After approximately 10 minutes, the scan tool will display “Programming Successful, Turn OFF Ignition.”
- Power Cycle: Turn OFF the ignition and wait for 2 minutes.
- Key Relearn: Turn the ignition to the RUN position for 15 seconds using the master key, then start the engine. This allows the TDM and ECM to relearn the key information and passwords. This completes the synchronization process.
- Clear Diagnostic Trouble Codes: Use the anti theft reset scan tool to clear any Diagnostic Trouble Codes (DTCs) that may be present.
Conclusion
Reprogramming the immobilizer in a 2007 Chevrolet Impala requires a specific procedure and a compatible anti theft reset scan tool. Following these steps ensures the successful relearning of the TDM and ECM, restoring the vehicle’s anti-theft functionality and allowing for proper operation. Remember to consult your vehicle’s service manual for specific instructions and recommendations. Using the correct tools and procedures is critical for a successful immobilizer reset.
