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 data of [Illumination Sensor Setting] and [Wiper link Auto Light Setup] using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>CUSTOMIZE .

   Is the setting in the [Support] and [ON]?

   Yes  : Go to  3 .

   No  : Turn the setting to [Support] and [ON].

3. 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  6 .

      No  : Go to  4 .

4. 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 and F/B fuse No. 5.

   No  : Go to  5 .

5. 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, harness and IG 2 relay.

   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 .
6. CHECK BODY INTEGRATED UNIT  .

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

   Does the display change as [OFF] ←→ [ON] when the lighting switch is moved from the OFF position to the AUTO position?

   Yes  : Go to  11 .

   No  : Go to  7 .

7. CHECK BODY INTEGRATED UNIT  .

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

   Connector and terminal 

   (i83) 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 BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

   No  : Go to  8 .

8. 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 and terminal 

      (i131) No. 19 - (i83) No. 20:

      Is the resistance less than 10 Ω?

      Yes  : Go to  9 .

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

9. CHECK HARNESS  .

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

   Connector and terminal 

   (i131) No. 12 - Chassis ground:

   Is the resistance less than 10 Ω?

   Yes  : Go to  10 .

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

10. 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 BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

    No  : Replace the combination switch (light). Ref. to LIGHTING SYSTEM>COMBINATION SWITCH (LIGHT) .

11. 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 from the OFF position to INT/LO/HI?

    Yes  : Go to  16 .

    No  : Go to  12 .

12. CHECK FRONT RELAY CONTROL MODULE  .

    Measure the voltage between front relay control module connector and chassis ground.

    Connector and terminal 

    (B68) No. 13 (+) - 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 front relay control module and replace it if defective.

    • Inspection: Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: Ref. to BODY CONTROL/COMMUNICATION SYSTEM>FRONT RELAY CONTROL MODULE .

    No  : Go to  13 .

13. CHECK HARNESS  .
    1. Disconnect the connectors of front wiper motor and front relay control module.
    2. Check the harness between the front wiper motor and the front relay control module.

       Connector and terminal 

       (B130) No. 1 - (B68) No. 13:

       Is the resistance less than 10 Ω?

       Yes  : Go to  14 .

       No  : Repair or replace the harness between the front wiper motor and the front relay control module.

14. CHECK HARNESS  .

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

    Connector and terminal 

    (B130) No. 4 - Chassis ground:

    Is the resistance less than 10 Ω?

    Yes  : Go to  15 .

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

15. CHECK FRONT WIPER MOTOR  .

    Check the continuity between front wiper motor terminals.

    Connector and terminal 

    (B130) No. 3 - (B130) No. 5:

    Is there continuity?

    Yes  : Check the front relay control module and replace it if defective.

    • Inspection: Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .
    • Replacement: Ref. to BODY CONTROL/COMMUNICATION SYSTEM>FRONT RELAY CONTROL MODULE .

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

16. 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  17 .

17. CHECK BODY INTEGRATED UNIT  .

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

    Connector and terminal 

    (i83) No. 12 (+) - Chassis ground (-):

    Does the voltage switch between OFF (9 to 16 V) ←→ ON (less than 1 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 BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

    No  : Go to  18 .

18. 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 and terminal 

       (i133) No. 3 - (i83) No. 12:

       Is the resistance less than 10 Ω?

       Yes  : Go to  19 .

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

19. CHECK HARNESS  .

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

    Connector and terminal 

    (i133) No. 2 - Chassis ground:

    Is the resistance less than 10 Ω?

    Yes  : Go to  20 .

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

20. CHECK COMBINATION SWITCH (WIPER)  .

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

    Connector and terminal 

    (i133) No. 3 - (i133) 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 BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

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