Key FOB starts car, but wont unlock/lock doors

The FOB has two sections.
The passive one uses RFID technology and does not require the internal battery to function; that starts the car.
The other functions DO require the battery. So either your replacement battery is bad too or that section of the remote has failed.
Does the other remote still work for all of the functions ??

 

Some people have had success when they took the old case apart, took out the battery and cleaned the circuit board really good then put it in a new case. Not saying it would work for you but it’s inexpensive to try. Look around this site for how to’s and don’t forget to move the RDFI chip when you do.

 

Since your current fob isn't fully programmed, you will not be able to fully program another key from it on your own without using Toyota Techstream software/hardware. Plus you would need to purchase codes as part of the key reseed procedure. ($5-$20 per code)

So technically you could do it yourself, but it would take some purchases plus a few hours of your time learning how to do and and then finally actually doing it. Plus you'd have to go get keys cut for the door locks.

Check with your dealership on pricing, call independent locksmiths as well.

 

Check with a dealer first.
Then call some locksmiths.
You likely will be amazed at the difference it prices.

The really important part is the RFID, which is needed to start the engine.
If that part in your one key stops working.......or is lost or damaged, you are then stuck with a BIG repair bill as you have to replace a computer board along with new FOBS. IIRC, that runs about $600 or more.

Don't delay getting a second FOB; now you probably need 2 new ones.

 

The current remote and/or a needed ECU inside the car could simply have just died. Electronic parts will fail too, although these particular parts have a very low failure rate.

BTW, does the car have SKS? Do you see a small square rubberish black button on the front exterior door handle (driver and passenger side) and at the trunk hatch near the Toyota symbol?

It will probably be best pay a dealer for a RESET (clear all fobs from memory) and a RESEED (program new fobs to work w/ the car).
Price shop this around. Don't forget dealer discount coupons; some dealers have this on their websites. Dealers will accept other dealers discount coupons. AAA, AmEx, Costco, also have discount coupons too.

You will probably want to purchase two NEW fobs, esp if you will be paying a dealer for the RESET and RESEED procedure. NEW fobs come with the small metal key to manually unlock the drivers door. You can get the key cut anywhere. If you know the 5digit key tag code, the dealer can cut it precisely. If you don't know this 5digit key code, maybe the dealer can look it up?
8907047180, non-SKS fob; $106 at AutoNation in Houston, TX.
8999447061, SKS fob; $150.75 at AutoNation in Houston, TX.
Some dealers will match other dealer's online price, you just have to ask.

 

[QUOTE="exstudent, post: 2901953, member: 53251
Some dealers will match other dealer's online price, you just have to ask.[/QUOTE]

All good advice.
But some locksmiths can do the very same thing.....get the FOBs and program them......for about half the dealer price.

 

I am watching this as I just had the same issue at church last night. I have not been able to lock my car since. I get a message on the dashboard when I exit the car saying "Key not found".

I am thinking this is a good thing, I don't want the key in the car. I have both fobs on my person. I have tried to lock the car with both fobs near and far and even tried to start the car with the fobs as this will automatically lock the car until a fob is near. Still the fob is not working. I have owned my car about 18 months now and am very frustrated with this. I do not mind not locking when at church but want to lock up when in the city at work.