Hi, there are some threads about this.
In 2003 GM switched the electronics to data bus 2, it has an extra high speed communication wire for computers to talk in real time. Also, your car has to be programmed to accept the radio. Do you have the GPS antenna? There are 2 versions of the Bose amplifier going with different nav units.
Please go up one level to the Yukon forum and then search for nav radio.
This will keep you busy for a while. This whole subject is neither easy nor simple.
You may have to get into all kinds of part numbers and wiring pieces.
Take care, Eggert
