Locked Out of Your Own Car
You walk up to your 2023 Highlander with groceries in hand, reach for the door handle expecting it to unlock... and nothing happens. The smart key that's supposed to make life easier is suddenly making it very inconvenient.
Before you call a locksmith or dealer, let's try some easy fixes. Most keyless entry failures are simple problems with simple solutions.
Symptoms of Keyless Entry Failure
- Doors won't unlock when touching the handle
- Push-button start won't recognize the key
- Key works intermittently
- One key works, another doesn't
- Lock/unlock buttons on fob don't work
- Key works only when very close to vehicle
Start With the Obvious
Dead Key Fob Battery
The most common cause by far. The 2023 Highlander key uses a CR2032 battery. Average lifespan is 1-2 years, but varies based on usage. If one key works and another doesn't, the non-working key needs a battery.
Quick test: If the touch-to-unlock fails but you can still start the car by holding the dead fob against the start button, it's definitely the fob battery.
Key Fob Too Far Away
The fob must be within about 3 feet of the door handle. If it's buried deep in a bag or pocket, the signal may be blocked.
Interference
Other wireless devices, metal objects, or even buildings with certain security systems can interfere with key fob signals. Try stepping away from the area.
Other Possible Causes
Vehicle Battery Issues
A weak 12V battery in the Highlander can cause all sorts of electronic gremlins, including keyless entry failures. If the car has been sitting or accessories were left on, this could be it.
Door Handle Sensor Failure
The touch sensor in the door handle can fail or get dirty. If one door doesn't respond but others do, this is likely.
Key Fob Needs Resyncing
Occasionally, the key loses its connection to the vehicle. A resync procedure (dealer or certain DIY methods) can restore it.
Smart Key ECU Problem
The receiver module in the vehicle can fail, though this is rare on a 2023 model.
How to Replace the Key Fob Battery
- Release the physical key from the fob (small switch on back)
- Insert a flat tool into the seam and twist to separate the case
- Pop out the old CR2032 battery
- Insert new battery with + side facing up
- Snap the case back together
What It Costs
- CR2032 battery: $3 - $8
- Door handle sensor replacement: $200 - $400
- Key fob replacement (dealer): $250 - $500
- Key reprogramming: $100 - $200
- Smart key ECU: $400 - $800
Emergency Access
If your fob dies and you need to get in:
- Use the physical key hidden inside the fob to unlock the driver's door manually (keyhole hidden behind a cover on the handle)
- Hold the dead fob against the start button—the backup coil can still detect it at very close range
Warranty Note
The 2023 Highlander's keyless entry system is covered under the 3-year/36,000-mile basic warranty. Fob batteries are wear items and not covered, but sensor or ECU failures should be repaired free.