Please take a picture and post it. If it's the Car Info I'm thinking about, that is for OBDII. If you want to see Car Info with more/any info, you may need an OBDII module...but that's a whole other can of worms.
Canbus is a module used to communicate with various systems in the car. The Canbus module only interacts with systems that are available on your car. If the head unit doesn't need any of the items or your car doesn't provide them, then you won't see them. Is anything not working on your head unit? Typical things that the Canbus module might provide are:
- steering wheel buttons
- rear view camera
- backup camera tracking - lines that turn/bend based on steering wheel angle
- air conditioning/heater controls
- door open/close indicators
- audio/amplifier controls
Also, even if your vehicle has some of these features, they may or may not go through the Canbus. Some, none or all of the features may need the Canbus.
What year is your car? There are usually more features going through Canbus for newer cars. Mine is a Kia Sorento 2012 and while I was provided with a Canbus module, only the sound for the amplifier was going through the Canbus. Unfortunately the Canbus software still didn't work with it and I had to get another module. In any case, even if some of the above features goes through the Canbus, it doesn't mean it will work.
So, is there anything specific you're looking for?