The Pioneer AVIC-F700BT and many other units have pre-amp outputs. The wires in the harness for the Saab 9-5 go straight to the amplifier in the car so you need to use these in this setup. Other sound systems and vehicles may have to use the built-in amplifies so you would use the other wires in the head unit harness.
Cut the RCA cable in half and solder the ends to the Metra wire harness using the diagram below. It may be a good idea to label the wires so you can easily identify Front and Rear when you plug them into the head unit harness.
Back of Metra wire harness where the wires come out (colors may vary when using a different harness).
No connection: 3
Ground: 4
Remote On control for amplifier: 7
Power supply (constant): 8
Front Red RCA pole: 14
Front Red RCA shield: 10
Front White RCA pole: 15
Front White RCA shield: 11
Rear Red RCA pole: 13
Rear Red RCA shield: 9
Rear White RCA pole: 16
Rear White RCA shield: 12
The wire harness comes with the 2 extra wires. Take the blue/white wire and place it in position #7. This is the wire for turning on the car amplifier.
