2021 Toyota Highlander – Key Fob Programming

Quick reference

Step-by-step on-board programming

Unfortunately, the 2021 Toyota Highlander utilizes a Smart Key system, which means it's not possible to program additional key fobs yourself using a simple on-board procedure. The vehicle's immobilizer system and Smart Key ECU require specialized diagnostic equipment to register new key fobs. This process typically involves connecting a scan tool to the vehicle's OBD-II port to communicate with and update the vehicle's computer system.

Battery replacement

1. Remove the emergency key: Slide the small release button on the side of the fob and pull out the metal emergency key.
2. Pry open the fob: Using a small flat-head screwdriver or a coin, carefully pry the two halves of the key fob apart. There's usually a small notch or slot where you can insert your tool.
3. Replace the battery: Note the orientation of the old CR2032 battery (positive side usually facing up) and remove it. Insert the new CR2032 battery with the positive side facing the same direction.
4. Reassemble the fob: Carefully snap the two halves of the key fob back together, ensuring they are securely sealed. Reinsert the emergency key.

Where to buy a replacement fob

• Toyota Dealership: This is the most straightforward option, ensuring you get a genuine OEM part specifically matched to your Highlander. However, it's typically the most expensive, often ranging from $300 to $500 or more, which usually includes the cost of the fob, cutting the emergency key, and programming.
• Automotive Locksmith: A qualified automotive locksmith can often provide and program a new key fob for less than a dealership. They have the necessary diagnostic tools and can typically cut the emergency key blade on-site. Prices can vary but are often in the $200 to $400 range.
• Online Retailers (e.g., Amazon, eBay): You can often find aftermarket key fobs or even genuine OEM fobs (used or new) at a significantly lower price online, sometimes under $100. However, you must be extremely careful to ensure the FCC ID (HYQ14FBC) and part numbers match exactly. Be aware that buying online means you'll still need to factor in the cost of cutting the emergency key and professional programming, as these are not covered by the online purchase.

If on-board programming isn't supported

Since the 2021 Toyota Highlander uses a Smart Key system, professional programming is required. The cost for this will vary depending on where you go:

• Dealership: As mentioned, expect to pay a premium. The programming fee alone can be $100-$150, on top of the fob cost.
• Locksmith: Locksmiths are generally more affordable than dealerships for programming services, often charging $75-$150 for programming. They can also cut the emergency key blade.

The 2021 Toyota Highlander utilizes a sophisticated immobilizer system with a transponder chip embedded in the Smart Key. This chip communicates wirelessly with the vehicle's immobilizer ECU. When a new key fob is programmed, the vehicle's computer needs to learn and store the unique identification code of the new transponder, allowing the vehicle to start. This is why specialized equipment is necessary and DIY on-board programming is not an option for this model.

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