2002-2007 Buick Rendezvous & 2001-2005 Pontiac Aztek Security Light and No-Start Guide

Understanding the GM Anti-Theft System in Your Rendezvous or Aztek

If your 2002-2007 Buick Rendezvous or 2001-2005 Pontiac Aztek cranks but won't start, and you see a flashing "Security" light on the dashboard, you are likely dealing with an issue in the vehicle's Passlock anti-theft system. This is a very common problem on these vehicles. The system has three main components that can cause this failure: the Passlock sensor in the ignition lock cylinder, the Anti-Theft Control Module, and the Body Control Module (BCM). All three must work together perfectly to allow the engine to run. When one part fails or is replaced, the system loses its synchronization, triggering the security lockdown.

Symptoms of a Failing Anti-Theft Module

A problem within the Passlock system can cause a range of frustrating symptoms. While a no-start condition is the most severe, other electrical issues often appear as well.

• Flashing "Security" Light: This is the most common indicator. The light may flash while cranking or stay on steadily while driving.
• Engine Cranks But Won't Start: The starter will turn the engine over, but it will not fire up because the fuel injectors are disabled by the security system.
• Engine Starts and Immediately Stalls: The engine may run for a second or two and then shut off. This is a classic Passlock symptom.
• Radio and Power Windows Inoperative: In many cases, a security fault will also cause the radio to display "LOCKED" and disable the power windows. This often points to a communication failure with the Body Control Module (BCM).
• No Crank, No Start: In some instances, the system may prevent the starter from engaging at all.

Associated Diagnostic Trouble Codes (DTCs)

A professional scan tool that can read Body (B) and Network (U) codes is essential for accurate diagnosis. Generic engine code readers often won't see these.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no specific recalls for the anti-theft module itself on the Buick Rendezvous or Pontiac Aztek, the system is a well-documented source of owner complaints. The underlying cause is often the failure of the Body Control Module (BCM), which manages the security logic. There are several unrelated recalls for these vehicles concerning fuel leaks, airbag sensors, and steering components, which should be checked by VIN on the NHTSA website.

Programming and Relearn Requirements: The 30-Minute Relearn Procedure

This is the most important part of this guide. After replacing the anti-theft module, BCM, ignition lock cylinder, or even after a dead battery, the system must be re-synchronized. You do NOT need a dealer or a special scan tool to do this. You can perform the manual 30-minute relearn procedure yourself.

1. Insert the key into the ignition.
2. Turn the key to the "ON" position (do not start the engine). The "Security" light will be on or flashing.
3. Leave the key in the "ON" position for approximately 10-11 minutes, or until the "Security" light turns off.
4. Once the light turns off, turn the key to the "OFF" position and wait 10 seconds.
5. Repeat steps 2-4 two more times, for a total of three 10-minute cycles.
6. After the third cycle is complete and you have turned the key "OFF," the vehicle has now learned the new module/key data. You should be able to start the engine normally.

Replacement Guide

Part Location

There is often confusion between the Anti-Theft Module and the Body Control Module (BCM), both of which are involved in the security system.

• Anti-Theft Control Module (Part #10355946): This module is located directly on the steering column, near the ignition switch. It is often sold as part of the steering column assembly.
• Body Control Module (BCM): The BCM is a larger module located under the center console, typically attached to the interior fuse block with a large lever-style connector. Many security functions are integrated into the BCM.

For a no-start issue with a B2960 code, the problem is most often resolved by performing the relearn procedure. If the relearn fails or you have communication codes (U-codes), the BCM is a more likely culprit.

Buying a Used Anti-Theft Control Module

Buying a used OEM anti-theft module is a smart and cost-effective repair strategy for the Buick Rendezvous and Pontiac Aztek. Aftermarket options are scarce to non-existent, and a new OEM module can be expensive.

• Compatibility: The physical module is the same for all 2002-2007 Buick Rendezvous and 2001-2005 Pontiac Aztek models. The key is the relearn procedure after installation.
• Mandatory Relearn: A used module will NOT be plug-and-play. It retains security information from its donor vehicle. You MUST perform the 30-minute relearn procedure after installation for it to learn your vehicle's key and BCM.
• Inspection: When buying used, inspect the module for any signs of physical damage, corrosion on the pins, or water intrusion. Ensure all connector ports are clean and intact.
• Why Used OEM is a Good Choice: For an electronic part like this, a recycled OEM module that has been tested is often more reliable than a cheaply made aftermarket alternative. Since the relearn procedure is straightforward and requires no special tools, a used module presents excellent value.

Cost of Replacing the Anti-Theft Module

The cost can vary significantly depending on the part source and whether you perform the labor yourself.

Frequently Asked Questions (FAQ)