Check Wiper Interlock Headlight System

Trouble symptom: 

The headlights do not go off when the wiper is deactivated, or the headlights do not turn on when the wiper is activated.

1. CHECK HEADLIGHT SYSTEM  .

   Check the operation of the headlight system.

   Is the headlight system normal?

   Yes  : Go to  2.

   No  : Check and repair the headlight system, Ref. to LIGHTING SYSTEM>Headlight System>INSPECTION>CHECK HEADLIGHT SYSTEM .

2. CHECK BODY INTEGRATED UNIT SETTING  .

   Display the [Illumination Sensor Setting] data using Subaru Select Monitor, Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   Is the setting in the [Support]?

   Yes  : Go to  3.

   No  : Turn the setting to [Support].

3. CHECK BODY INTEGRATED UNIT  .

   Display the data of [Wiper interlock auto light function ON/OFF setting] using Subaru Select Monitor, Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   Is the setting in the [ON]?

   Yes  : Go to  4.

   No  : Turn the setting to [ON].

4. CHECK BODY INTEGRATED UNIT  .
   1. Display the [IGN voltage] data using Subaru Select Monitor.

      Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   2. Turn the ignition switch to ON.

   Is the voltage 10 - 15 V?

   Yes  : Go to  7.

   No  : Go to  5.

5. CHECK HARNESS  .

   Measure the voltage between F/B fuse No. 5 and chassis ground.

   Is the voltage 10 V or more?

   Yes  : Repair or replace the harness between the body integrated unit and the ignition switch.

   No  : Go to  6.

6. CHECK CONNECTOR  .

   Check the connector or terminal of the body integrated unit for poor contact.

   Is there any fault?

   Yes  : Repair or replace the connector and harness.

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

   • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
   • Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .
7. CHECK BODY INTEGRATED UNIT  .

   Display the [Lighting AUTO input] data using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   Does the display switch between [OFF] <-> [ON] when the lighting switch is moved from the OFF position to the AUTO position?

   Yes  : Go to  12.

   No  : Go to  8.

8. CHECK BODY INTEGRATED UNIT  .

   Measure the voltage between the body integrated unit connector and chassis ground.

   Connector & terminal 

   (i81) No. 20 (+) - Chassis ground (-):

   Does the voltage change as OFF (9 to 16 V) <-> ON (less than 1 V) when the lighting switch is moved from the OFF position to the AUTO position?

   Yes  : Check the body integrated unit and replace it if defective.

   • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
   • Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

   No  : Go to  9.

9. CHECK HARNESS  .
   1. Disconnect the connectors of the combination switch (light) and the body integrated unit.
   2. Check the harness between the combination switch (light) and the body integrated unit.

      Connector & terminal 

      (i73) No. 19 - (i81) No. 20:

   Is the resistance less than 10 Ω?

   Yes  : Go to  10.

   No  : Repair or replace the harness between the combination switch (light) and the body integrated unit.

10. CHECK HARNESS  .

    Check the harness between the combination switch (light) and chassis ground.

    Connector & terminal 

    (i73) No. 12 - Chassis ground:

    Is the resistance less than 10 Ω?

    Yes  : Go to  11.

    No  : Repair or replace the harness between the combination switch (light) and chassis ground.

11. CHECK COMBINATION SWITCH (LIGHT)  .

    Check the combination switch (light). Ref. to LIGHTING SYSTEM>Combination Switch (Light)>INSPECTION .

    Is the combination switch (light) normal when the combination switch (light) is moved to AUTO position?

    Yes  : Check the body integrated unit and replace it if defective.

    • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

    No  : Replace the combination switch (light). Ref. to LIGHTING SYSTEM>Combination Switch (Light) .

12. CHECK BODY INTEGRATED UNIT  .

    Display the [Fr wiper input] data using Subaru Select Monitor, Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

    Does the display switch between [OFF] <-> [ON] when the combination switch (wiper) is operated between the OFF position and INT/LO/HI?

    Yes  : Go to  17.

    No  : Go to  13.

13. CHECK BODY INTEGRATED UNIT  .

    Measure the voltage between the body integrated unit connector and chassis ground.

    Connector & terminal 

    (B280) No. 6 (+) - Chassis ground (-):

    Does the voltage switch between OFF (less than 1 V) <-> ON (9 to 16 V) when the combination switch (wiper) is operated from the OFF position to INT/LO/HI?

    Yes  : Check the body integrated unit and replace it if defective.

    • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

    No  : Go to  14.

14. CHECK HARNESS  .
    1. Disconnect the connectors of the front wiper motor and the body integrated unit.
    2. Check the harness between the front wiper motor and the body integrated unit.

       Connector & terminal 

       (B8) No. 1 - (B280) No. 6:

    Is the resistance less than 10 Ω?

    Yes  : Go to  15.

    No  : Repair or replace the harness between the front wiper motor and the body integrated unit.

15. CHECK HARNESS  .

    Check the harness between the front wiper motor and chassis ground.

    Connector & terminal 

    (B8) No. 4 - Chassis ground:

    Is the resistance less than 10 Ω?

    Yes  : Go to  16.

    No  : Repair or replace the harness between the he front wiper motor and chassis ground.

16. CHECK FRONT WIPER MOTOR  .

    Check the continuity between front wiper motor terminals.

    Connector & terminal 

    (B8) No. 3 - (B8) No. 5:

    Is there continuity?

    Yes  : Check the body integrated unit and replace it if defective.

    • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

    No  : Replace the front wiper motor. Ref. to WIPER AND WASHER SYSTEMS>FRONT WIPER MOTOR AND LINK .

17. CHECK BODY INTEGRATED UNIT  .

    Display the [Front washer switch input] data using Subaru Select Monitor, Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

    Does the display switch between [OFF] <-> [ON] when the front washer switch on the combination switch (wiper) is operated from the OFF position?

    Yes  : Check the connection status of the harness and connector that may have a temporary poor contact.

    No  : Go to  18.

18. CHECK BODY INTEGRATED UNIT  .

    Measure the voltage between the body integrated unit connector and chassis ground.

    Connector & terminal 

    (i81) No. 12 (+) - Chassis ground (-):

    Does the voltage switch between OFF (less than 1 V) <-> ON (9 to 16 V) when the front washer switch on the combination switch (wiper) is operated from the OFF position?

    Yes  : Check the body integrated unit and replace it if defective.

    • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

    No  : Go to  19.

19. CHECK HARNESS  .
    1. Disconnect the connectors of the combination switch (wiper) and the body integrated unit.
    2. Check the harness between the combination switch (wiper) and the body integrated unit.

       Connector & terminal 

       (i68) No. 3 - (i81) No. 12:

    Is the resistance less than 10 Ω?

    Yes  : Go to  20.

    No  : Repair or replace the harness between the combination switch (wiper) and the body integrated unit.

20. CHECK HARNESS  .

    Check the harness between the combination switch (wiper) and chassis ground.

    Connector & terminal 

    (i68) No. 2 - Chassis ground:

    Is the resistance less than 10 Ω?

    Yes  : Go to  21.

    No  : Repair or replace the harness between the combination switch (wiper) and chassis ground.

21. CHECK COMBINATION SWITCH (WIPER)  .

    Check the continuity between terminals when the front washer switch on the combination switch (wiper) is pressed.

    Connector & terminal 

    (i68) No. 3 - (i68) No. 2:

    Is there continuity?

    Yes  : Check the body integrated unit and replace it if defective.

    • Inspection: Ref. to BODY CONTROL (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

    No  : Replace the combination switch (wiper), Ref. to WIPER AND WASHER SYSTEMS>COMBINATION SWITCH (WIPER) .