2016 Toyota Highlander Key Fob Programming Guide

As an ASE-certified electrical technician and automotive locksmith, I frequently get questions about replacing and programming keys for modern family SUVs. The 2016 Toyota Highlander is a fantastic vehicle, but when it comes to key fob replacement, Toyota’s security systems have evolved to the point where DIY on-board programming is no longer an option.

Whether your Highlander uses a standard turn-key (with an "H" chip) or a push-to-start Smart Key proximity fob, this guide will walk you through exactly what you need to know about replacing your key, changing the battery, and getting it programmed.

Quick reference

Here are the essential specifications for the 2016 Toyota Highlander key fobs:

Step-by-step on-board programming

If you are looking for a sequence of door-slams, brake-pedal presses, and ignition turns to program a 2016 Toyota Highlander key, I have some bad news: on-board DIY programming is not supported for this vehicle.

Toyota phased out on-board manual programming for the immobilizer and remote systems in the early 2010s to improve vehicle security. To program a new key fob (either standard or Smart Key) to a 2016 Highlander, a professional-grade OBD2 scan tool (such as Toyota Techstream, Autel, or Smart Pro) must be connected to the vehicle's diagnostic port.

Here is the general procedure a professional will follow to program your key:

1. Connect the programming tablet or scan tool to the Highlander’s OBD2 port under the driver's side dashboard.
2. Turn the ignition to the "ON" position (or press the start button twice without your foot on the brake if using a working smart key).
3. Access the Immobilizer / Smart Key system menu on the scan tool.
4. Select "Add a Key" (if you have at least one working key) or "All Keys Lost" (which requires an immobilizer reset).
5. Follow the on-screen prompts, which typically involve holding the working key near the start button, followed by holding the new, unprogrammed key near the start button until the vehicle beeps to confirm registration.
6. Test the remote functions (lock, unlock, panic, power tailgate) and start the engine to verify the programming was successful.

Battery replacement

A dead battery is the most common reason a fob stops working. The 2016 Highlander uses a standard CR2032 coin-cell battery. Here is how to replace it:

1. Remove the emergency key: Push the small release button or slide switch on the bottom or side of the fob and pull out the metal emergency key blade.
2. Pry open the shell: Use the tip of the emergency key (or a small flathead screwdriver) and insert it into the small slot left by the removed key. Twist gently to split the two halves of the plastic shell apart.
3. Remove the circuit board: Carefully lift the green circuit board out of the shell.
4. Swap the battery: Note the orientation of the old battery (usually positive "+" side facing up). Slide the old CR2032 out and insert the new one in the same direction.
5. Reassemble: Place the circuit board back into the shell, snap the two plastic halves firmly back together, and reinsert the metal emergency key.

Where to buy a replacement fob

When sourcing a replacement key fob for your 2016 Highlander, you have a few options:

• The Dealership: This is the most reliable option. You are guaranteed an OEM Toyota fob that will work flawlessly. Pros: Guaranteed compatibility and warranty. Cons: Very expensive; expect to pay between $250 and $400 for the fob alone, plus another $100+ for cutting and programming.
• Local Automotive Locksmith: Locksmiths can provide both OEM and high-quality aftermarket fobs. Pros: Generally cheaper than the dealer, and mobile locksmiths can come directly to your driveway. Total cost is usually between $200 and $300, including the key, cutting, and programming. Cons: Quality of aftermarket keys can vary depending on the supplier the locksmith uses.
• Online (Amazon / eBay): You can buy unprogrammed fobs online for $20 to $60. Pros: The cheapest upfront cost. Cons: You still have to pay a locksmith to cut and program it. Many locksmiths will not guarantee customer-supplied parts, and some cheap online fobs have faulty transponder chips that will not program at all.

If on-board programming isn't supported

Because the 2016 Highlander requires computerized programming, you must factor professional labor into your replacement costs.

The vehicle is equipped with a highly secure immobilizer system. Standard keys use Toyota's "H" chip transponder, while push-to-start models use a proximity Smart Key system. Both communicate directly with the vehicle's engine control module to prevent theft. If you lose all your keys ("All Keys Lost" situation), the programming process is significantly more complicated and expensive, as it requires resetting the immobilizer computer to accept new keys. Always try to keep at least two working keys on hand!

Expect to pay a professional between $80 and $150 just for the cutting and programming service if you supply your own fob, or $200 to $350 for a complete turnkey service.

Need help getting a new key cut and programmed for your SUV? Find a mobile locksmith or shop on Repairius.