Check Vehicle Signals With Diagnostic Mode

WARNING: This page is about a different car, the 2017 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Checking Vehicle Signals With Diagnostic Mode
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 signal status with the {Vehicle Signal Check} in the {Line Diag} screen.

Fig 2: Checking Signal Status With (Vehicle Signal Check) In (Line Diag) Screen

Courtesy of SUBARU OF AMERICA, INC.

Check illumination
NOTE: Make sure that the bright switch is not ON.
1. Set the lighting switch to the parking position.
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 control module, perform the Clear Memory Mode.
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 parking brake lever.
  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 behind the vehicle.
  1. Turn the ignition to ON.
  2. Pull the parking brake lever and depress the brake pedal, then place the select lever or gear shift lever in reverse.
  3. 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.