People...come on...Bluetooth (also known as 802.15) is a PERSONAL AREA NETWORK (PAN) service that operates in the 2.4GHZ range.
There are no less than SIX different possible versions or implementations of the technology at this time. These include:
- Bluetooth 1.0
- Bluetooth 1.0B
- Bluetooth 1.1
- Bluetooth 1.2
- Bluetooth 2.0
- Bluetooth 2.1
- Bluetooth 3.0
The most common implementations you'll see today (based on age of devices out there) will likely be the 2.x implementations but I know that some manufacturers are still using chips that are complaint to the 1.2 standards.
Should anyone be bored enough to want to know the specific differences, I suggest you visit;
Bluetooth - Wikipedia, the free encyclopedia
I have no idea what version the Toyota implementation subscribes to but it is likely 2.x as it's new and I doubt that Toyota would balk at buying a $4 chip (v2.x) vs a $1.50 chip (v1.x). That being said...if you're not following the written instructions for the device, the issue could be signal interference or just that the implementation of your devices is incompatible with the reader unit in your car.
Class dismissed.