2020 Toyota Highlander Key Fob Programming

Quick reference

Step-by-step on-board programming

Unfortunately, the 2020 Toyota Highlander does not have an on-board programming procedure for its smart key system (which includes the key fob). This means you cannot program a new key fob yourself using a series of button presses or key turns. The vehicle's immobilizer system, which uses sophisticated encryption, requires specialized equipment to sync a new key fob with your Highlander.

To program a new key fob, you will need a scan tool capable of accessing the vehicle's immobilizer system. This is typically found at a Toyota dealership or a qualified automotive locksmith.

Battery replacement

1. Remove the emergency key: Slide the small release tab on the side of the fob and pull out the emergency key blade.
2. Pry open the case: Use a small flathead screwdriver or a coin to carefully pry apart the two halves of the key fob. There's a small notch near where the emergency key was removed, offering a good starting point.
3. Replace the battery: Note the orientation of the old battery (CR2032) before removing it. Insert the new CR2032 battery with the positive (+) side facing up.
4. Snap the fob back together: Align the two halves of the key fob and press them firmly together until they click securely into place.
5. Reinsert the emergency key: Slide the emergency key back into its slot until it locks.

Where to buy a replacement fob

• Toyota Dealership:

  • Pros: Guaranteed genuine OEM part, professional programming, and warranty. They will cut and program the emergency key blade as well.
  • Cons: Most expensive option. Expect to pay anywhere from $300-$500 for the fob and programming.

• Automotive Locksmith:

  • Pros: Often more affordable than the dealership with comparable service. Many mobile locksmiths can come to your location, saving you a tow fee if your only key is lost. They can also cut and program the emergency key blade.
  • Cons: Quality of aftermarket fobs can vary. Ensure the locksmith uses a reputable brand or an OEM equivalent.
  • Ballpark Price: Typically $200-$400, depending on the locksmith and whether an OEM or aftermarket fob is used.

• Amazon/Online Retailers:

  • Pros: Lowest upfront cost for the physical fob.
  • Cons: You're only purchasing the hardware. You will still need to pay a dealership or locksmith to program it, and they may charge more if you bring your own part. There's also a risk of purchasing a counterfeit or incompatible fob. Often, these fobs do not include the emergency key blank, which will need to be purchased and cut separately.

If on-board programming isn't supported

As mentioned, the 2020 Toyota Highlander requires specialized equipment for key fob programming due to its advanced immobilizer system. This system is designed to prevent theft by ensuring only authorized keys can start the vehicle. Every key fob contains a unique transponder chip that communicates with the vehicle's computer. When programming a new fob, this chip's unique ID must be registered with the vehicle.

Cost Expectations: As detailed above, expect to pay for both the key fob itself and the programming service. Because a scan tool is required, your options are limited to dealerships or qualified automotive locksmiths. The total cost will likely be between $200 and $500, including the fob and programming.

Immobilizer Transponder: The 2020 Toyota Highlander utilizes a sophisticated encryption-based immobilizer system. The key fob (smart key) contains an integrated transponder chip that continuously communicates with the vehicle. This system does not use a simple, cloneable transponder like older models. Therefore, merely "copying" an existing key's transponder data is generally not possible; the new fob must be programmed directly to the vehicle's immobilizer unit.

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