That would be good advice normally, but there are puzzling differences. The MUTE wire in the D3 was grounded, but the instructions on the 8500 say if no mute on your car, leave mute wire unconnected. Not sure which is best. The instructions also say to connect parking brake wire to the positive side of the emergency brake switch. The old one on my D3 was tied to ground.
Also, the Steering Wheel interface is programmable...sooooooo...I think is customized for both the vehicle and the radio...vehicle didn’t change...but the radio is a significant upgrade and might require a program chan