I had this issue a while back. From the top of my head, I'm pretty sure by default, it's the last 3 digits of your VIN number. You can either find it in the manual, or find it under the drivers seat. There will be a plastic that you have to remove, and lift the carpet to see the VIN number engraved to the chassis. From there, you'll have to perform a few steps to initialize the mode to be able to enter the the code. Note that apparently, it is said that you can only have a total of 10 tries, before the radio will lock and you will have to contact Toyota. And it is said that it isn't a cheap issue if you do have your radio locked after exceeding 10 attempts. Not sure if you could check how many attempts are remaining, but just keep it in mind how the number of attempts you choose. Using the VIN number worked for me, I don't know if I tried using 0000 but if I did, it didn't work for me. All the best mate!