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Check Halogen Headlight System

Trouble symptom: 

Headlight does not illuminate.

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

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

      Yes:  The headlight system is normal.

      No:  Go to  2.

  2. CHECK HARNESS  .
    1. Disconnect the headlight connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage between the headlight connector and chassis ground.

      Connector & terminal 

      RH side 

      (B487) No. 1 (+) - Chassis ground (-):

      (B487) No. 6 (+) - Chassis ground (-):

      LH side 

      (B477) No. 1 (+) - Chassis ground (-):

      (B477) No. 6 (+) - Chassis ground (-):

      Is the voltage 10 - 13.5 V?

      Yes:  Go to  3.

      No:  Go to  4.

  3. CHECK BULB  .

    Check the headlight bulb.

    Is the bulb normal?

    Yes:  Go to  4.

    No:  Replace the headlight bulb.

  4. CHECK FUSE AND RELAY  .
    1. Turn the ignition switch to OFF.
    2. Check the M/B fuse No. 4, M/B fuse No. 3 and H/L LO relay. Ref. to LIGHTING SYSTEM>RELAY AND FUSE>INSPECTION .

      Is the check result OK?

      Yes:  Go to  5.

      No:  Replace the defective fuse or relay.

  5. CHECK CURRENT DATA  .
    1. Display the following items using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .
      • [key-lock warning SW]: (model without keyless access with push button start)
      • [ACC Input]: (model with keyless access with push button start)
    2. Turn the ignition switch to ON.

      Does the display switch between [OFF] - [ON] after operating the ignition switch?

      Yes:  Go to  6.

      No:  Replace the body integrated unit. Ref. to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

  6. CHECK HARNESS  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connector of body integrated unit.
    3. Measure the voltage between the body integrated unit connector and chassis ground.

      Connector & terminal 

      (B280) No. 3 (+) - Chassis ground (-):

      (B287) No. 3 (+) - Chassis ground (-):

      Is the voltage 8.5 - 16.5 V?

      Yes:  Go to  7.

      No:  Repair or replace the harness.

  7. CHECK CURRENT DATA  .
    1. Turn the ignition switch to ON.
    2. Display the data of [Lighting I Switch Input], [Lighting II Switch Input] and [Dimmer Hi Switch Input] using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .
      • Do the displays of [Lighting I Switch Input] and [Lighting II Switch Input] switch between [OFF] ←→ [ON] when the lighting switch is moved to switch 1 (TAIL) and switch 2 (HEAD) positions?
      • Does the display of [Dimmer Hi Switch Input] switch between [OFF] ←→ [ON] when the dimmer & passing switch is moved to the switch UP position?

      Yes:  Go to  11.

      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).

  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 

      Except for C5 model 

      (i171) No. 35 - (i73) No. 18:

      (i171) No. 19 - (i73) No. 20:

      (i81) No. 28 - (i73) No. 20:

      (i171) No. 26 - (i73) No. 11:

      (i171) No. 36 - (i73) No. 17:

      C5 model 

      (i171) No. 35 - (i73) No. 19:

      (i171) No. 19 - (i73) No. 20:

      (i81) No. 28 - (i73) No. 20:

      (i171) No. 26 - (i73) No. 11:

      (i171) No. 36 - (i73) No. 17:

      Is harness normal?

      Yes:  Go to  10.

      No:  Repair or replace the harness.

  10. CHECK HARNESS  .

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

  11. CHECK CURRENT DATA  .
    1. Turn the ignition switch to ON.
    2. Display the data of [Lighting I Lamp Output], [Lighting II Lamp Output] and [Lighting Hi Lamp Output] using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .
      • Do the displays of [Lighting I Lamp Output] and [Lighting II Lamp Output] switch between [OFF] ←→ [ON] when the lighting switch is moved to switch 1 (TAIL) and switch 2 (HEAD) positions?
      • Does the display of [Lighting Hi Lamp Output] switch between [OFF] ←→ [ON] when the dimmer & passing switch is moved to the switch UP position?

      Yes:  Go to  12.

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

  12. CHECK HARNESS  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the connectors of body integrated unit and each light.
    3. Check the harness between body integrated unit and each light.

      Connector & terminal 

      Headlight 

      (B280) No. 9 - (B487) No. 6:

      (B287) No. 7 - (B477) No. 6:

      Parking light and front side marker 

      (B280) No. 10 - (B487) No. 3:

      (B280) No. 10 - (B477) No. 3:

      Rear combination light 

      (B280) No. 10 - (R26) No. 1:

      (B280) No. 10 - (R28) No. 1:

      License plate light (4 door model) 

      (B280) No. 10 - (R77) No. 1:

      (B280) No. 10 - (R76) No. 1:

      License plate light (5 door model) 

      (B280) No. 10 - (D44) No. 1:

      (B280) No. 10 - (D137) No. 1:

      Relay 

      H/L LO relay No. 4 - (B287) No. 6:

      H/L LO relay No. 4 - (i171) No. 23:

      H/L LO relay No. 2 - (B281) No. 20:

      H/L LO relay No. 2 - (i171) No. 18:

      Is harness normal?

      Yes:  Go to  13.

      No:  Repair or replace the harness.

  13. CHECK HARNESS  .

    Check the harness between each light connector and the chassis ground.

    Connector & terminal 

    Headlight 

    (B487) No. 7 - Chassis ground:

    (B477) No. 7 - Chassis ground:

    Parking light and front side marker 

    (B487) No. 4 - Chassis ground:

    (B477) No. 4 - Chassis ground:

    Rear combination light (4 door model) 

    (R26) No. 2 - Chassis ground:

    (R28) No. 2 - Chassis ground:

    Rear combination light (5 door model) 

    (R26) No. 4 - Chassis ground:

    (R28) No. 4 - Chassis ground:

    License plate light (4 door model) 

    (R77) No. 2 - Chassis ground:

    (R76) No. 2 - Chassis ground:

    License plate light (5 door model) 

    (D44) No. 2 - Chassis ground:

    (D137) No. 2 - Chassis ground:

    Is harness normal?

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

    No:  Repair or replace the harness.

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