If it looks like this (except orange)
then it is the base unit and you have to swap the LED's. If it is the premium then you can change it with the radio settings.
If the car still has the Scion owners manual/first aid kit in the glove box, there should be a radio manual that will have all the info.
If you do have/want to change the LED's it is a pain. They are tiny (.8mmX1.6mm), there are nearly forty of them and you have to take the radio apart. A good afternoons project for someone with experience and very likely nearly impossible for someone who doesn't have an electronics background and the tools for the job.