Toyota Key Battery
My was having some trouble with his Toyota remote and actually thought it would need to be replaced. So rather than leave him to spend what’s likely a lot of money, we went ahead and opened it up. We did a video as well that you can see here.
There is a gap upper corner that is your way in. A small screwdriver will do the trick.
Note right away that the buttons are loose and keeping the button side down would be helpful. Also, the buttons only fit in one spot each, so not to worry.
The battery is found in a case inside the key and it too needs to be separated. Check out the video for instructions and have a CR 2016 battery on hand. There is a circuit board inside that is loose and also goes in just one way.
See more videos for Toyota keys and fob battery replacements here,
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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Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow.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
The acronyms 
The acronym SRH changes the reference to Steering Responsive Headlights, but is exactly the same type of system. If any of the OFF lights flash or remain lit, they indicate a fault in the system, and your dealer will be needed for a repair.
Another indicator of a malfunction are the 
If you drive a Polestar, note that they have begun using the symbol to the right to indicate that a lamp has malfunctioned. Follow the link here for more.
From what we’ve discovered only Mercedes and some vehicles made by the Volkswagen Group offers the option to close everything again using the lock button. The Honda we have here does not.
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 like me, your keys rest in the pocket the same way each time.
So lets set some parameters. Our first thought is to look for Troubleshooting chapter. So, result #1 is that not a single one of these 25 manufacturers have a chapter with this title. Only 3, Mazda (right), Toyota and Lexus, even use the word Trouble. Emergency, Roadside or Breakdown are most likely to be found, and this is a pretty short hurdle. VW raises the hurdle, with a Do It Yourself chapter that includes flat tires and dead batteries, etc. that tend to be found in the Breakdown chapters from other manufacturers.
So, back to the our troubleshooting-like chapters. Once inside, only Honda/Acura, Toyota/Lexus and Subaru got this right! Setting aside for a moment the fact that the owner’s manual is most likely inside the car and the driver locked outside, at least if the driver manages to get the car open, he or she will be able to get started.
Subaru (right), Lexus and Toyota chapters point directly to pages with solutions to issues with the electronic keys. Again, it may not be obvious to the driver that the key fob is the problem, but these manufacturers come the closest to nailing the problem. Titling the sections using something like what to do if the car does not respond to the electronic key would come closest to replicating exactly what the driver is experiencing.
If you’ve ever walked out to your car and found all the windows open, this is the subject. Keyless start vehicles made by BMW and Mini, Honda and Acura, Ford and Lincoln, Maserati, Mercedes, Toyota and Lexus and Volkswagen Group, include what is called a convenience feature, which opens all the windows for ventilation when the unlock button is pressed and held. The sunroof will be open as well if there is one and the car unlocked.
In this case, you might try using a device like a carabiner or snap hook. It can be hooked to a strap and still actually be closed into the bag. But it won’t work its way to the bottom. The devices come in many different sizes and colors so you can be a stylish as you’d like and they can be found online or at most hardware stores.
Disabling a Key Fob Could Prevent Car Theft
We came across a video some time ago from Now You Know – linked here – where a Toyota guy highlighted a Toyota key fob feature: Disabling a Key Fob. Press and hold the lock button, and while doing so, press the unlock button twice. This disables the proximity access feature of the fob.
We then verified it on a Toyota as well and it works! See the video below.
Now, not to worry, a simple press of the unlock button not only gets you in the car, it also restores the proximity feature.
But we’re not Toyota guys, so we set out to test as many cars as we could get our hands on. But before we get there, why is this even important?
The proximity feature of a fob only works within about 18 inches of a lock. But the fact is, clever thieves can tap into the signal from a live fob even though its seemingly not in use. Likely as not you’ve had the experience of using an unlock or lock button from 50 ft or even more. I can lock/unlock my car from a good 70 ft.
This is the signal that can be tapped from a live fob, essentially duplicated on a computer and your car is gone. The video is from CNN is right here.
And it can be done while you’re at home and the car is in you’re driveway! This is the value of the disabled fob feature.
What of Other Manufacturers
So who else? We tried a Nissan, but no dice. Actually, it turns that two Nissan models we tested do not lock or unlock with a touch of the door handle, so disabling is unnecessary. We tried a Dodge, which again did not work.
We then tested a Lexus, which is a Toyota product, it did work. It did not work on an Audi, a Volvo, a Polestar, an Acura, a Volkswagen or a BMW.
So, this is a call to all manufacturers to implement the feature, and to you the owner of any Toyota and Lexus models to use the feature. And if you have a model from a manufacturer that we didn’t test, try it and let us know in the comments if it worked – or not.
We did a video on the subject, linked below.
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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