Just letting you all know. To bypass the new AVIC-X850BT. Simply ground the slot next to the mute wire. You can move the mute wire over or just insert a skinny wire into the empty slot and make sure its tight and wont work itself loose over time.
also ground the original light green parking brake wire.
See the picture where a light green wire is inserted. This is the spot.
Jeff
Total Auto Protection
Miami, FL.