Check Vehicle Signals With Line Diag Mode

Turn the ignition switch to ACC.
Press the button (b) twice with the button (a) pressed.

Courtesy of SUBARU OF AMERICA, INC.

NOTE: Pressing the button (a) for 3 seconds or more, or turning the ignition switch from the OFF to ACC position can exit the diagnostic mode.
{Line Diag} screen is displayed.

Check the signal status with the {Vehicle Signal} in the {Line Diag} screen.

Courtesy of SUBARU OF AMERICA, INC.

Item	Contents	Inspection
Batt Volt	Battery voltage	Check that the battery voltage is displayed.
IG	IGN signal	Check that the display shows ON.
PKB	Parking brake signal	Pull the parking brake switch, and check that the display shows ON.
REV	Reverse signal	Place the select lever in reverse, and check that the display shows ON.
Bright	Bright signal	Turn the bright switch to ON, and check that the display shows ON.
SPEED	Speed pulse signal	Input the vehicle speed and check that it turns ON.
ILL+	Illumination signal	Turn the lighting switch to ON, and check that the display shows OK.
Steering	Steering angle	Check that the steering operation is reflected on the display.