I have not done a 2010 Forester XT install. I have done the regular, non-turbo model 2010 Forester.
That being said, all the info I have found seems to indicate that there is no Ignitnion Switch Harness
differences between these regular key models. The ignition switch wiring is shown below. A few things
to point out. You will be using the Vipers Flex relay to power the cars Starter2 circuit. This
will require a change to the Viper programming. Set Menu 3, Feature 8 to Option 3. Additionally,
you will need an extra relay to power all of the Foresters ignition wires as there are 2 Accessory
wires. This wiring is also shown below.
2010 Subaru Forerster XT Ignition wires
Remote Start, 10-pin heavy gauge connector
1 NC No Connection
2 RED/BLACK (+) FUSED 12V ACC/STARTER INPUT................White
3 PINK/BLACK (+) FLEX RELAY INPUT 87A ...............................Not Used
4 PINK/WHITE (+) IGNITION 2 / FLEX RELAY OUTPUT..............White/Red *Program as Starter2
5 RED (+) FUSED 12V IGNITION 1 INPUT.....................................White
6 GREEN (+) STARTER INPUT (KEY SIDE)...................................White/Black
7 VIOLET (+) STARTER OUTPUT (CAR SIDE)..............................White/Black
8 ORANGE (+) ACCESSORY OUTPUT...........................................Blue
9 RED/WHITE (+) FUSED 12V IGNITION 2 / FLEX .......................White
10 PINK (+) IGNITION 1 INPUT/OUTPUT..........................................Green
Viper 24 Pin harness
Pin 23 of 24 Orange (-) 200mA Accessory Output................................to external relay Pin 85
30/40 Amp SPDT external relay for ACC2
Relay Pin 85 to Viper Orange Pin 23 of 24
Relay Pin 86 and 87 to Forester White at Ign Switch with 20 Amp fuse
Relay Pin 30 to Forester ACC2 Yellow at Ign Switch
Cutting the Starter1 wire for Starter Kill and Anti-Grind is optional. If you don't want/need
this feature, don't cut the White/Black wire and only connect the Viper Violet wire. The Viper
Green wire will be "not used". If you do cut the wire, test to be sure the Starter Kill and Anti-
Grind feature work with just that one Starter wire cut. You might have to do the cut routine
on the Starter2 wire also which would involve some wiring changes.
If you have a manual transmission, here is the clutch interlock info :
Clutch Pedal WHITE\BLACK (INPUT) BLUE\WHITE (OUTPUT) (+ N.O.) @ CLUTCH SWITCH
Soldering is fun!