Check Each Vehicle Signal

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

Fig 1: Identifying Ignition Switch To ACC Button
Courtesy of SUBARU OF AMERICA, INC.

NOTE: Pressing the button (c) 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 connection status with the {Vehicle Signal Check} in the {Line Diag} screen.

Fig 2: Screen Display Line Diag
Courtesy of SUBARU OF AMERICA, INC.

NOTE: GPS is displayed only for the navigation system.

Check illumination
NOTE: Before starting inspections, turn the ignition to ON.
1. Set the lighting switch to the parking position.
  Make sure that the bright switch is not turned ON at this time.
2. Make sure that {ON} lights in ILL+ and then the screen becomes dim.
  ON: Normal
  
  OFF: Abnormal Check the signal line connector. If there are no problems, the unit could be faulty.
Check speed sensor
NOTE:
- Before starting inspections, check the safety around the vehicle.
- Lift up the vehicle as necessary.
- When the diagnostic trouble code is input in the VDC CM, perform the Clear Memory operation.
1. Drive the vehicle at 9 km/h (6 MPH) or more.
2. Check that {ON} is displayed in SPD.
  ON: Normal
  
  OFF: Vehicle speed is less than 7 km/h (4 MPH), or malfunction is detected in the signal line. Check the signal line connector. If there are no problems, the unit could be faulty.
Check parking brake signal
1. Pull the parking brake lever or switch.
2. Check that {ON} is displayed in PKB.
  ON: Normal
  
  OFF: Abnormal Check the signal line connector. If there are no problems, the unit could be faulty.
Check back sensor
NOTE: Before starting inspections, check the safety around the rear end of the vehicle and then turn the ignition to ON.
1. Pull the parking brake lever or switch, and depress the brake pedal, then put the select lever in reverse.
2. Make sure that {ON} is displayed in REV.
  ON: Normal
  
  OFF: Abnormal Check the signal line connector. If there are no problems, the unit could be faulty.
Check ignition signal
1. Turn the ignition to ON.
2. Make sure that {OFF} is displayed in IGN.
  NOTE: There is no signal line; therefore, always {OFF} is displayed.