How to Open, Start and Replace Fob Batteries in Lexus, Toyota and Scion Vehicles
Nine videos offering help to Lexus, Toyota and Scion drivers who’s key fobs or remote controls have gone dead.
Table of Contents
- This video is an update of NX and RC models and now covers the 2016 and newer RX as well as new UX models.
- General Lexus video help, including models featuring a hidden key hole.
- Another video for the new Lexus NX and RC F models.
- Video help specific for Prius models.
- A recent (post-2019) Lexus key fob battery replacement.
- A video of us replacing the battery in an early Lexus dead key fob or remote control.
- This one is for Toyota key fobs exclusively.
- An updated look at a Lexus (and some Toyota) key fob battery replacement, newer fob.
- This one is for newer (2018+) Toyota key fobs.
- This one is a standard old school remote control.
This video is an update of NX and RC models and now covers the 2016 and newer RX as well as new UX models.
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General Lexus video help, including models featuring a hidden key hole.
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Another video for the new Lexus NX and RC F models.
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Video help specific for Prius models.
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A recent (post-2019) Lexus key fob battery replacement.
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A video of us replacing the battery in an early Lexus dead key fob or remote control.
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This one is for Toyota key fobs exclusively.
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An updated look at a Lexus (and some Toyota) key fob battery replacement, newer fob.
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This one is for newer (2018+) Toyota key fobs.
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This one is a standard old school remote control.
Models covered include the Lexus CT, ES, GS, GX, IS, LS, LX, NX, RC, RX, RZ, TX, UX, and Toyota FR-S, iA, iM, tC, 4Runner, Avalon, Camry, Corolla, Highlander, Land Cruiser, Mirai, RAV4, Sequoia, Sienna, Tacoma, Tundra, Yaris, 86, C-HR, Supra, and Prius.
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY
ignition button with the Toyota, Scion or Lexus logo facing the button or switch. Press the Start / Stop button, keeping the brake pedal depressed. You can even press the button with the fob itself.
The new (2020) Toyota Supra is an exception. There is an image of a key with lines radiating from it on the side of the steering column. Hold the back of the remote control (NOT the tip like the image) against the marked area on the steering column and press the Start/Stop button within 10 seconds while depressing the brake.
Another exception is the Toyota Prius in the 2004 through 2009 model years. These cars have a slot beneath the Start/Stop button that will accept the key fob. Insert the fob, buttons up, then press the Start/Stop button while depressing the brake pedal as normal.
A final exception (right) is found in early Lexus LS models. It uses a key fob with a tapered end and a start cylinder that is turned to start the car. In this case, the taped end of the fob is inserted into the start cylinder. The car will recognize the key fob, which can then be used to turn the cylinder.
message to Step on the Brake. Press the brake pedal very, very hard when trying to start the vehicle again to be sure that the release switch behind the pedal is engaged. Or wait a few minutes and try again.
Four key fob (remote control or ‘clicker’) versions may be seen in Toyota, Lexus and Scion models. The earliest version (left), used only in the Lexus LS for a few years, the mechanical key remains attached to the key fob. Pull the latch found on top of the fob. At the same time, slide the lever on the side upward until the key blade is fully exposed.
The mechanical key is removed from the remaining fob styles. Slide the catch on the top of most Lexus key fobs, or on the side of Toyota and Scion models. Some later 
Lexus models use this key as well. Pull the key ring from the fob while the catch is slid to one side to remove the emergency or mechanical key blade.
A slight variation in even later Lexus models has the slide lever on the top of the key ring end, but not on the mechanical key itself. Slide the lever and pull the key ring away to retrieve the mechanical key.
If the keyhole is not visible, insert the mechanical key into the slot at the base of the door lock cover located near the back of the driver’s door handle and lift slightly to pry away the lock cover and expose the lock cylinder. If you are in the dark, you may need to feel for the slot. Yes, you must pry off a piece of the car. Insert the key blade into the now-exposed lock cylinder to operate. The key can only be inserted in one direction, so turn the key over and try again if it does not go in the first time.
If you do not see a seam or a keyhole, you have the latest Lexus models, the NX, UX and RC as well as RX models built after 2016. This door handle style has since been incorporated into ES and LS models. Pull the driver’s door handle out as shown in the image to expose the keyhole. Insert the mechanical key and turn and you’re in. There is only a small amount of space, so actually turning the key can be a chore.
If you are fortunate enough to own the Lexus LC models, the door handles are flush to the body. Press the front of the driver’s door handle inwards, then pull the rear of the handle out. The key hole is then exposed behind the rear portion of the handle. As above, insert the key and turn and you’re in.
Finally, with the re-introduced Toyota Supra in 2020 come open and start features clearly taken from BMW! The key hole is hiding behind an oval shaped cover at the back of the driver’s door handle. Pull the door handle out and feel for a metal clip is behind the cap and give it a push outward.
The cap will practically fly off revealing the key cylinder. You are still removing a piece of your car and its still ok! Let go of the handle and use the mechanical key to unlock the door using the key cylinder that is now visible through the handle and you’ll be inside.
New in 2023, Lexus NX, RX, RZ and TX feature a rectangular pry off cover (right) at the back of the driver’s door handle. Slip a credit card or some equivalent into a gap at the front of the cover and pry the cover outward. When the cover clears the handle, push it from the rear to remove it fully. The key hole will then be exposed.
Why Are All My Windows Down??
Who Opened the Windows?
Here, we discuss a feature found in cars from a number of manufacturers that catches people with their pants down. Or rather with their windows down. So, this is not about a fault or a system failure or a warning light, but about something working exactly as it is supposed to, but doing so seemingly at random on its own.
Can it be Shut Down?
From what we’ve discovered only Mercedes and some vehicles made by the Volkswagen Group offer the option to close everything again using the lock button. The Honda we had for demonstration (below) did not.
So, what is causing the surprise window openings can be explained by accidental button presses. Whether carried in a bag or in a pocket, something pressing on the unlock button for an extended period can and will activate the feature, if the key fob is within 50 feet or so. Remember that while the fob’s keyless access can only operate within 18 to 24 inches of the vehicle’s door handle, the buttons on the key fob will work from a much greater distance.
For a fob carried in a pocket, preventing this may be a simple as turning the fob over on the key ring. The buttons will face the other way if your keys tend to rest in the pocket the same way each time.
If it is carried in a bag, the nature of keyless open and start can easily lead to the fob migrating to the bottom of the bag. Anything and everything sitting on top of the fob can and will activate the feature.
To finish the discussion of the functions of the actual convenience feature, the windows will stop short if the button is released, and will continue down if it is pressed and held again. Some vehicles require the unlock button to be pressed and released once before the convenience feature will work.
In Honda and Acura vehicles, the feature can also be activated by holding the mechanical key turned to the right in the key cylinder, but this will not happen accidently. Also, turning and holding the key back to the left will close the windows and sunroof.
The feature can be disabled in Ford, Lincoln, Toyota and Lexus vehicles, but you’ll need your dealer. In fact, the feature in a Toyota and Lexus must have first been activated in this way.
So, if ever you find your windows wide open one day, don’t panic — find a new way to carry your key fob.
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY