Program BMW Key to Start Car: A DIY Guide Using Autel IM608

Lost your BMW key or need a spare? Getting a new key from the dealership can be surprisingly expensive and inconvenient. Fortunately, with the right tools, you can program a BMW key yourself. This guide will walk you through the process of programming a BMW key to start your car using the Autel IM608 diagnostic and key programming tool, along with related components. This method can save you a significant amount of money compared to dealership costs, while providing you with the knowledge and satisfaction of handling this task yourself.

Understanding the Tools Needed for BMW Key Programming

To program a BMW key, you’ll need specific equipment designed for automotive key programming. Here are the key components used in this process:

Autel IM608: This is the central programming computer. The IM608 is a powerful diagnostic and key programming tool capable of handling complex tasks like BMW key programming and immobilizer functions. It communicates with your vehicle’s systems to perform the necessary programming steps.
JVC Programmer (J2534 ECU Programmer): The JVC Programmer acts as a crucial interface between the Autel IM608 and your BMW’s OBD (On-Board Diagnostics) port. It facilitates the communication and data transfer required for programming.
Autel XP400 Key Programmer: The XP400 is a key and chip programmer extension for the IM608. It’s essential for reading and writing data to the car’s Front Electronic Module (FEM) or Body Domain Controller (BDC) module, especially when the module needs to be “jailbroken” for programming.
BMW Key (PCF7953): Choosing the correct type of key is critical. For newer BMW models, the PCF7953 key is recommended and offers better quality compared to older versions like PCF7945. Ensure you purchase the PCF7953 key fob designed for BMW OEM systems for optimal compatibility.
Alligator Clip: A small alligator clip is needed to connect to a specific circuit on the FEM/BDC module during the “jailbreaking” process. This connection is temporary and allows the XP400 to interact directly with the module’s circuit board.

Step-by-Step Guide to Program Your BMW Key

The process of programming a BMW key with the Autel IM608 involves several steps, which may vary slightly depending on your BMW model and whether your FEM/BDC module is already “jailbroken.” Here’s a general step-by-step guide based on a user’s successful experience:

1. Preparation and Initial Connection

Begin by connecting the Autel IM608 to your BMW.

Connect the JVC programmer to the Autel IM608.
Plug the JVC programmer into your BMW’s OBD port, typically located under the dashboard on the driver’s side.
Turn on the Autel IM608 and navigate to the “Immobilizer” function in the main menu.
Select “Smart Selection” and then choose “FEM/BDC” to initiate the BMW key programming process.
The IM608 will automatically communicate with your car, read your FEM/BDC module information, and provide on-screen instructions.

2. FEM/BDC Module “Jailbreak” (If Required)

For many BMWs, especially older models, the FEM/BDC module needs to be “jailbroken” before key programming over OBD is possible. This security measure prevents unauthorized key programming.

If your FEM/BDC module is not already jailbroken, the IM608 will prompt you to perform this step.
Disconnect the Car Battery: Ensure the car’s ignition is off and disconnect the negative terminal of the battery for safety.
Remove the FEM/BDC Module: Locate and carefully remove the FEM/BDC module from your BMW. The location varies by model, but it’s often behind the glove box or in the footwell area. Consult your BMW repair manual for the exact location and removal procedure.
Identify the Circuit and Attach Alligator Clip: On the FEM/BDC module’s circuit board, locate the specific small circuit indicated by the IM608 (refer to the tool’s instructions and potentially online videos for guidance specific to your module).
Prepare the Circuit Contact Point: Use a fine knife to gently scratch off the PCB coating from the identified circuit to ensure a good electrical connection with the alligator clip. Be extremely careful not to damage any pins or components.
Connect XP400 and Alligator Clip: Connect the alligator clip from the Autel XP400 programmer to the prepared circuit on the FEM/BDC module. Ensure the XP400 is connected to the IM608.
Read Data with IM608: Follow the IM608’s on-screen prompts to read data from the FEM/BDC module using the XP400 connection. This step is crucial for modifying the firmware.

3. Firmware Read/Write and OBD Connection

After the initial data read with the direct connection, you’ll need to work between the car and your workspace.

Reinstall FEM/BDC Module: Carefully reconnect the FEM/BDC module back into your BMW, ensuring all connectors and fuses are properly reattached.
Reconnect Car Battery: Reconnect the car battery’s negative terminal.
Power On and OBD Programming (First Pass): Turn the car’s ignition to the “on” position (without starting the engine). Allow the IM608 to program files over the OBD connection. The tool may automatically download necessary files during this stage.
Remove FEM/BDC Module Again: After the OBD programming step, disconnect the car battery again and remove the FEM/BDC module once more.
Direct Write with XP400 (Second Pass): Reconnect the XP400 and alligator clip to the FEM/BDC module as before. This time, the IM608 will write modified firmware files to the module’s circuit.
Reinstall FEM/BDC Module (Final Time): Reinstall the FEM/BDC module into the car and reconnect the battery.

4. Final OBD Programming and Key Addition

With the FEM/BDC module firmware modified, the final steps involve OBD programming to add the new keys.

Final OBD Connection: Connect the IM608 to the OBD port again.
Complete Programming: Follow the IM608 prompts to complete the programming process. This typically involves writing additional data and configuring the system for key recognition.
Add Keys: Use the IM608’s “Add Key” function to program your new PCF7953 keys. Follow the on-screen instructions, which usually involve placing the new key fob near the programmer or in a designated location within the car.
Test Keys: After programming, test both your original keys and the newly programmed keys to ensure they start the car and all remote functions are working correctly.

Cost Savings and Benefits of DIY BMW Key Programming

Programming your BMW key yourself using the Autel IM608 and related tools offers significant cost savings. Dealerships often charge exorbitant prices for replacement keys, sometimes reaching upwards of $1600 for two keys.

DIY Cost: The cost of two PCF7953 keys and potentially renting or purchasing the Autel IM608 (if you don’t already own it) can be significantly less than dealership prices. In the original user’s experience, programming two keys cost approximately $50 in key blanks, highlighting the potential savings.
Control and Convenience: DIY key programming gives you more control over the process and avoids the need to schedule appointments and wait for dealership service.
Learning Experience: Performing this task yourself provides valuable hands-on experience with automotive diagnostics and key programming, enhancing your understanding of your vehicle’s systems.

Conclusion

Programming a BMW key to start your car is an achievable DIY task with the Autel IM608 and the right procedure. While it requires careful attention to detail and following instructions, the process can save you considerable money and provide a satisfying sense of accomplishment. Keep in mind that newer BMW models might simplify the process, potentially eliminating the “jailbreaking” step and allowing for quicker OBD key programming. Always ensure you have a stable power supply during the programming process and refer to reliable video tutorials and the Autel IM608’s instructions for model-specific guidance. By taking a methodical approach, you can successfully program your BMW key and get back on the road without the hefty price tag of dealership key replacement services.