How To Program Infiniti Key Fob

Losing or damaging your Infiniti key fob can be a frustrating experience. The good news is that programming a new or replacement key fob yourself is often possible, saving you a potentially hefty bill from the dealership. This article will provide a comprehensive guide to programming Infiniti key fobs, covering the underlying technology, common issues, and best practices. This guide is geared towards the intermediate car owner or DIY mechanic who understands basic automotive electrical systems and is comfortable performing relatively straightforward procedures.

Background of Infiniti's Keyless Entry System

Infiniti utilizes a sophisticated keyless entry system that relies on Radio Frequency Identification (RFID) and immobilizer technology. The key fob transmits a unique encrypted radio signal to the vehicle's receiver. This signal is then validated by the car's onboard computer, typically the Body Control Module (BCM) or the Engine Control Unit (ECU), depending on the vehicle year and model. If the signal matches a pre-programmed code stored in the vehicle's memory, the system unlocks the doors and, more importantly, allows the engine to start. The immobilizer system is a crucial security feature that prevents unauthorized individuals from starting the car, even if they have a duplicate key blank. Without the correct transponder code, the ECU will not allow fuel injection or ignition.

Older Infiniti models might use a simple proximity key system with a separate key blank that physically turns in the ignition. Newer models use a push-button start system, where the key fob only needs to be present inside the vehicle. Regardless of the type, the core principle remains the same: secure wireless communication between the key fob and the vehicle's onboard computer.

Technical Breakdown: How Key Fob Programming Works

The process of programming an Infiniti key fob involves synchronizing the fob's unique code with the vehicle's immobilizer system. This typically requires entering a specific programming mode on the vehicle and then following a sequence of steps to add the new key fob to the list of authorized devices. The exact procedure can vary depending on the Infiniti model and year, but generally involves the following steps:

1. Entering Programming Mode:

This often involves a specific sequence of actions with the key (if equipped) or the ignition button, and sometimes a combination of brake pedal presses and door lock operations. For example, a common method on older Infiniti models might be to insert and remove the key from the ignition cylinder a certain number of times within a specified time frame. Alternatively, on newer models with push-button start, you might need to press and hold the start button in a specific sequence, often without depressing the brake pedal. Consult your vehicle's owner's manual or a reputable online resource for the precise sequence applicable to your specific Infiniti model.

Successfully entering programming mode is often indicated by a visual cue, such as the hazard lights flashing, or an audible chime. This signifies that the vehicle is ready to learn a new key fob.

2. Programming the Key Fob:

Once the vehicle is in programming mode, you'll typically need to press and hold one or more buttons on the key fob. This transmits the fob's unique code to the vehicle's receiver. The system will then attempt to verify and store the code in its memory. Some systems may require you to press and hold the lock and unlock buttons simultaneously. After pressing the required buttons, you might hear another chime or see the hazard lights flash again, confirming that the key fob has been successfully programmed.

3. Exiting Programming Mode:

After programming all the desired key fobs (usually, you can program multiple fobs at once), you'll need to exit programming mode. This often involves turning the ignition off (or pressing the start button to the off position) and opening and closing the driver's side door. The vehicle should then return to its normal operating state.

4. Testing the Key Fob:

After programming, thoroughly test the key fob's functionality. Verify that it can lock and unlock the doors, activate the panic alarm, and start the engine (if equipped with a push-button start). If any of these functions are not working correctly, you may need to repeat the programming procedure.

Tools Needed:

• New or replacement Infiniti key fob (ensure it's compatible with your vehicle's year and model)
• Vehicle owner's manual (for specific programming instructions)
• Potentially, a scan tool capable of key fob programming (for some newer models, see below)

Advanced Programming: Scan Tools and Security Codes

On newer Infiniti models, particularly those manufactured after 2010, the programming process may be more complex and require the use of a specialized scan tool. These tools can communicate with the vehicle's onboard computer and perform more advanced programming functions, including key fob programming. Some scan tools may also require a security code or PIN code to access the immobilizer system. This code is typically provided by the dealership and is specific to your vehicle.

If you're attempting to program a key fob on a newer Infiniti model and the standard procedure outlined above is not working, you likely need a scan tool. There are various aftermarket scan tools available that can perform key fob programming, but it's crucial to choose a tool that is compatible with your vehicle and has the necessary functionality.

Common Issues and Maintenance Concerns

• Incorrect Programming Sequence: The most common issue is not following the correct programming sequence for your specific Infiniti model. Always consult your owner's manual or a reputable online resource.
• Incompatible Key Fob: Using an incompatible key fob will prevent successful programming. Ensure that the fob is designed to work with your vehicle's year and model.
• Low Battery in Key Fob: A weak battery in the key fob can interfere with the programming process. Replace the battery with a new one before attempting to program the fob.
• Faulty Key Fob: If the key fob is damaged or defective, it may not be programmable. Try a different key fob to rule out this possibility.
• Immobilizer System Issues: In rare cases, the immobilizer system itself may be malfunctioning. This can prevent any key fob from being programmed. This usually requires diagnosis and repair by a qualified mechanic.
• BCM or ECU Problems: Rarely, issues with the Body Control Module or Engine Control Unit may prevent successful key fob programming. This typically requires professional diagnostic and repair services.

Regular maintenance for your key fob includes replacing the battery as needed (usually CR2032 or CR2025 button cell batteries). Keep the key fob clean and dry, and avoid exposing it to extreme temperatures.

Do's and Don'ts / Best Practices

Do's:

• Consult Your Owner's Manual: Always refer to your vehicle's owner's manual for the specific key fob programming procedure.
• Use a Compatible Key Fob: Ensure that the key fob you are using is designed to work with your vehicle's year and model.
• Replace the Key Fob Battery: Start with a fresh battery to eliminate this as a potential issue.
• Follow Instructions Carefully: Pay close attention to the timing and sequence of steps in the programming procedure.
• Test the Key Fob Thoroughly: After programming, verify that all functions are working correctly.

Don'ts:

• Attempt Programming Without Proper Information: Avoid guessing the programming sequence. Use reliable sources.
• Force the Process: If the programming procedure is not working, don't force it. Stop and troubleshoot the issue.
• Ignore Warning Signs: If you notice any unusual behavior from the vehicle during the programming process, such as error messages or unusual noises, stop immediately.
• Assume all Infiniti models have the same programming procedure: Each model may have slightly different procedure.

Conclusion

Programming an Infiniti key fob can be a relatively straightforward process if you follow the correct procedure and have the necessary tools. However, on newer models, a scan tool may be required. If you're uncomfortable performing this procedure yourself, or if you encounter any difficulties, it's always best to consult a qualified mechanic or your local Infiniti dealership. While the DIY approach can save you money, improper programming can potentially lead to more significant issues with your vehicle's electrical system. Before attempting any key fob programming, thoroughly research the procedure for your specific Infiniti model and year and weigh the risks and benefits carefully. If you're not comfortable, don't hesitate to seek professional assistance.