Model With SRH

Wiring diagram: 

Headlight system Ref. to WIRING SYSTEM>HEADLIGHT SYSTEM>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK HEADLIGHT ILLUMINATION  .
   1. Turn the ignition switch to ON.
   2. Turn the lighting switch to the switch 1 (TAIL) position.
   3. Turn the lighting switch to the switch 2 (HEAD) position.
   4. Turn the dimmer & passing switch to the switch UP position.

   Do the parking light and headlight (low beam and high beam) come on?

   Yes  : The headlight system is normal.

   No  : Go to  2.

2. CHECK DTC  .
   1. Turn the ignition switch to ON and wait for at least 10 seconds.
   2. Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)

   Is DTC displayed?

   Yes  : Perform the diagnosis for the displayed DTCs. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST

   No  : Go to  3.

3. CHECK POWER SUPPLY  .

   Using the Subaru Select Monitor, display the following items in the [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR

   • [BATT voltage (control)]
   • [BATT voltage (BACKUP)]
   • [IGN voltage]

   Is the voltage 9 - 16 V?

   Yes  : Go to  4.

   No  : Check the body integrated unit and replace it if defective.

   • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE
   • Replacement: Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT
4. CHECK CURRENT DATA  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, display the following items in the [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR
      • [Lighting II Switch Input]
      • [Dimmer Hi Switch Input]

   Does the display change between [OFF] ←→ [ON] when the lighting switch is moved to the switch 2 (HEAD) and switch UP (HI) positions?

   Yes  : Go to  5.

   No  : Check the combination switch or harness for open circuit.

5. CHECK CURRENT DATA  .
   1. Turn the ignition switch to ON.
   2. Using the Subaru Select Monitor, display the following items in the [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR
      • [Lighting II Lamp Output]
      • [Lighting Hi Lamp Output]

   Does the display change to [ON] when turning the lighting switch to the switch 2 (HEAD) position and switch UP (HI) position?

   Yes  : Go to  6.

   No  : Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT

6. CHECK HARNESS  .
   1. Turn the ignition switch to OFF.
   2. Check the harness between the headlight connector and the chassis ground.

      Connector & terminal 

      Headlight RH 

      (B121) No. 4 - Chassis ground:

      Headlight LH 

      (B122) No. 4 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes  : Check the headlight assembly and replace it if defective.

   No  : Repair or replace the defective part.