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Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow.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.
Disabling a Fob
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.
Toyota Symbols
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.
Toyota symbols page joins the new color treatment list
Our Toyota symbols page has now been aligned by color. We’ve have now transformed several pages, including our primary symbols page, to reflect the new color ordering.
The page features a number approaching 100 indicators, now ordered red through black, white or gray scale. This generally provides a “mostly serious” to “simply letting you know” range. We used the term “mostly serious” for red indicators because many legacy red symbols do not point to a problem with the vehicle.
Regardless, the new ordering provides a cleaner, simpler option for drivers searching for information.
The Toyota symbols page can be found 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