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Auto Headlight System Check

Wiring diagram: 

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

G16526801Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK HEADLIGHT AND TAIL LIGHT ILLUMINATION  .
    1. Turn the ignition switch to ON.
    2. Make the light control sensor vicinity dark.
    • Do the parking light, headlight, and tail light illuminate when the lighting switch is moved to the AUTO position?
    • Do the parking light, headlight, and tail light go off when approximately 15 seconds have elapsed since the area around the light control sensor is made bright while the lighting switch is at the AUTO position?

    Yes:  The auto headlight system is normal.

    No:  Go to  2.

  2. CHECK BODY INTEGRATED UNIT SETTING  .

    Using Subaru Select Monitor, display data of [Illumination Sensor Setting] in [Customize] of [Body Control]. Ref. to BODY CONTROL (DIAGNOSTICS)>CUSTOMIZE .

    Is the setting in the [Support]?

    Yes:  Go to  3.

    No:  Turn the setting to [Support].

  3. CHECK DTC  .

    Read DTCs of the following items using the Subaru Select Monitor. Ref. to LAN SYSTEM (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    • [Body Control]
    • [Combination meter]
    • [Brake Control]
    • [Automatic Light and Wiper]

    Is DTC displayed?

    Yes:  Perform the diagnosis for the displayed DTCs.

    No:  Go to  4.

  4. CHECK BODY INTEGRATED UNIT SETTING  .

    Using Subaru Select Monitor, display data of [Auto Light Sensitivity Adjustment] in [Customize] of [Body Control]. Ref. to BODY CONTROL (DIAGNOSTICS)>CUSTOMIZE .

    Is the setting in the [OFF]?

    Yes:  Go to  5.

    No:  Turn the setting to [OFF], Go to  5.

  5. CHECK CURRENT DATA  .
    1. Using Subaru Select Monitor, display data of [Illumination Rate Info] in [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR .
    2. Measure the values when the brightness around the light control sensor is changed.
      • When the light control sensor is covered with cloth, etc. to make the vicinity dark.
      • When the light control sensor is exposed to sunlight or made close to intense light such as incandescent light to 300 mm (11.81 in) or less to make the vicinity bright.

      Illumination sensor output 

      Dark condition: 003E or more

      Bright condition: 003C or less

      NOTE: The output value is displayed in hexadecimal format.

    Is the value output according to the brightness?

    Yes:  Go to  7.

    NOTE: If you changed the [Auto Light Sensitivity Adjustment] setting in step 4, change it back to the initial value.

    No:  Go to  6.

    NOTE: If you changed the [Auto Light Sensitivity Adjustment] setting in step 4, change it back to the initial value.
  6. CHECK HARNESS  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors from body integrated unit and light control sensor.
    3. Check the harness between body integrated unit and light control sensor.

      Connector & terminal 

      (i362) No. 15 - (i159) No. 3:

      (i362) No. 14 - (i159) No. 4:

      (i362) No. 13 - (i159) No. 6:

    Is harness normal?

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

    No:  Repair or replace the defective part.

  7. CHECK CURRENT DATA (BODY INTEGRATED UNIT)  .
    1. Turn the ignition switch to ON.
    2. Set the lighting switch to AUTO position.
    3. Using the Subaru Select Monitor, display the following items in the [Data monitor] of [Body Control]. Ref. to COMMON (DIAGNOSTICS)>DATA MONITOR .
    • Other than for C0
    • [Writing AUTO SW input]
    • For C0
    • [Lighting I Switch Input]
    • [Lighting II Switch Input]
    • Is [Writing AUTO SW input] set to [ON]? (Except for C0)
    • Are [Lighting I Switch Input] and [Lighting II Switch Input] set to [OFF]? (For C0)

    Yes:  Replace the body integrated unit. Ref. to BODY CONTROL/COMMUNICATION SYSTEM>BODY INTEGRATED UNIT .

    No:  Go to  8.

  8. CHECK COMBINATION SWITCH (LIGHT)  .
    1. Turn the ignition switch to OFF.
    2. Check the combination switch (light). Ref. to LIGHTING SYSTEM>COMBINATION SWITCH (LIGHT)>INSPECTION .

    Is the combination switch (light) normal?

    Yes:  Go to  9.

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

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

      Connector & terminal 

      Other than for C0 

      (i361) No. 25 - (i131) No. 18:

      (i361) No. 2 - (i131) No. 20:

      (B70) No. 12 - (i131) No. 20:

      (i361) No. 23 - (i131) No. 19:

      For C0 

      (i361) No. 25 - (i131) No. 19:

      (i361) No. 2 - (i131) No. 20:

      (B70) No. 12 - (i131) No. 20:

      (i361) No. 23 - (i131) No. 18:

    Is harness normal?

    Yes:  Go to  10.

    No:  Repair or replace the defective part.

  10. CHECK HARNESS  .

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

    Connector & terminal 

    (i131) No. 13 - Chassis ground:

    Is the resistance less than 10 Ω?

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

    No:  Repair or replace the defective part.

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