I noticed a lack of postings related to 2019 Fusions. Thought I would share some of the information I have.
2017-2019 Have the factory door code printed on a label on the back of your interior fuse panel. You can also retrieve the factory code if you have two keys available.
12v (+) - Grey / Red - [Gateway Connector Behind OBD]
Ignition (+) - Blue / Grey - [Harness Running to Front of Dash] (Ignition Sense Only)
Parking Lights (+) - Black / Blue - [@ Light Switch, White 18-pin Connector, Pin 4]
Parking Lights (-) - Grey - [@ Light Switch, White 18-pin Connector, Pin 11]
Foot Brake (+) - Purple / White - [@ Foot Brake]
Lock (-) - Grey - [Drivers Door Module, Pin 20]
Unlock (-) - Purple - [Drivers Door Module, Pin 10]
Trunk Release (-) - Grey / Yellow - [@ Trunk Release Switch on Dash]
Horn (-) - Green / White - [@ Horn Switch or BCM]
Tach (~) - Green / Blue - [Top Side of Engine, 8-Pin Plug, Pin 2 & 4]
Vehicle Speed Sensor (~) - Brown / Green - [PCM near Passenger Firewall]
Reverse Lights (+) - Blue / White - [BCM, 36-Pin Plug, Pin 11]
Radio 12v (+) - White / Brown - [@ Radio, Black 24-Pin Connector, Pin 1]
Radio Ground (-) - Black / Grey - [@ Radio, Black 24-Pin Connector, Pin 13]
Radio Ignition (+) - [HS Can-Bus]
Radio Illumination (-) - [HS Can-Bus]
Factory Remote Amp Turn-On (+) - Purple / Red - [@ Radio, Black 24-Pin Connector, Pin 18]
Power Antenna (+) - Green / Purple - [@ Radio, Black 24-Pin Connector, Pin 2]
AUX Audio Input (+) - Blue - [@ Radio, Black 24-Pin Connector, (AUX 1, Pin 12) (AUX 2, Pin 13)]
AUX Audio Input (-) - Grey / Orange - [@ Radio, Black 24-Pin Connector, (AUX 1, Pin 25) (AUX 2, Pin 26)]
AUX Video Input (+) - White / Green - [SYNC Module, Black 54-Pin Connector, Pin 14]
AUX Video Input (-) - Brown / Purple - [SYNC Module, Black 54-Pin Connector, Pin 15]
Door Pins
Front Left (-) - Green / Purple - [Dash Fuse Box, Blue 52-Pin Connector, Pin 33]
Front Right (-) - White - [Dash Fuse Box, Blue 52-Pin Connector, Pin 21]
Rear Left (-) - Green - [Dash Fuse Box, Blue 52-Pin Connector, Pin 46]
Rear Right (-) - Yellow - [Dash Fuse Box, Blue 52-Pin Connector, Pin 19]
Speakers
Front Left (+) - White - [@ Radio & Speaker, Black 24-Pin Connector, Pin 22]
Front Left (-) - White / Brown - [@ Radio & Speaker, Black 24-Pin Connector, Pin 10]
Front Right (+) - White / Purple - [@ Radio & Speaker, Black 24-Pin Connector, Pin 23]
Front Right (-) - White / Orange - [@ Radio & Speaker, Black 24-Pin Connector, Pin 11]
Rear Left (+) - White / Green - [@ Radio & Speaker, Black 24-Pin Connector, Pin 21]
Rear Left (-) - Brown / Yellow - [@ Radio & Speaker, Black 24-Pin Connector, Pin 9]
Rear Right (+) - Brown / White - [@ Radio & Speaker, Black 24-Pin Connector, Pin 24]
Rear Right (-) - Brown / Blue - [@ Radio & Speaker, Black 24-Pin Connector, Pin 12]
Center Speaker Front (+) - Green - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 1]
Center Speaker Front (-) - Grey / Yellow - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 5]
Center Speaker Back (+) - Green / Brown - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 9]
Center Speaker Back (-) - Purple / Brown - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 13]
Subwoofer (+) - Green / Purple - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 2]
Subwoofer (-) - Grey - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 10]
Subwoofer 2 (+) - Purple - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 1?]
Subwoofer 2 (-) - Yellow - [Amplifier, Right Side of Trunk, Grey 16-Pin Connector, Pin 9?]