Hello, and welcome. I have posted a picture of the wiring diagrams.
Not to butt in, but you should not hardwire the Sony to your Malibu wiring, as you will lose a number of components & abilities.The System in your Malibu is Class 2 DATA Type You need to use a DATA Type Adapter which will save the components & is color for color connections, making it almost Goof Proof.
Just my 2 cents & please accept goodwrench9124 above
all I have is the GM wiring diagrams, if you look at the wiring diagrams i have posted they have the colors marked. if you need the pictures of connectors with the wire color and locations in connector I also can post these too. just a note this vehicle uses a class two type radio. there is two wires from the radio that used for communication, so the radio can communicate to other modules. also you should know, removing the factory radio, you will loose some functions on the car.