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Home >> Subaru >> 2021 >> WRX Premium, Standard Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System >> Day Time Running Light System >> Inspection >> Daytime Running Light Module Check (Halogen Headlight Model)
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Daytime Running Light Module Check (Halogen Headlight Model)

  1. CHECK FUSE. 
    1. Turn the ignition switch to OFF.
    2. Check the fuses of the daytime running light relay and headlight HI.

    Is the fuse OK?

    Yes:  Go to  2.

    No:  Replace the fuse.

  2. CHECK RELAY. 

    Check the headlight HI relay in the main fuse box. Refer to LIGHTING SYSTEM>RELAY AND FUSE>INSPECTION .

    Is the relay OK?

    Yes:  Go to  3.

    No:  Replace the relay.

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

    Does the headlight (high beam) illuminate?

    Yes:  Go to  4.

    No:  Check the combination switch (light) and headlight bulb.

  4. CHECK BODY INTEGRATED UNIT. 

    Read the DTC of body integrated unit using Subaru Select Monitor. Refer to BODY CONTROL SYSTEM (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .

    NOTE: For detailed operation procedures, refer to "Application help".

    Is DTC displayed?

    Yes:  Perform the diagnosis according to DTC. Refer to BODY CONTROL SYSTEM (DIAGNOSTICS)>LIST OF DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Go to  5.

  5. CHECK BODY INTEGRATED UNIT. 

    Display the data of «Daytime Running Light(DRL) Setting for North America» using Subaru Select Monitor.

    Is the setting «High Beam Dimming System»?

    Yes:  Go to  6.

    No:  Set the setting to «High Beam Dimming System».

  6. CHECK CURRENT DATA. 

    Display the following items using Subaru Select Monitor.

    • «Parking Brake Switch Input»
    • «EPB Operating status» (model with EPB)
    • «Shift position»
    • «Lighting II Switch Input»

      Is the input signal normal?

    Yes:  Go to  7.

    No:  Check the defective part.

  7. CHECK CURRENT DATA. 
    1. Start the engine.
    2. Release the parking brake and place the shift position to other than P range.
    3. Display the data of «DRL Cancel Output» using Subaru Select Monitor.

    Does the display of «DRL Cancel Output» switch «OFF»<↔>«ON» when switching the lighting switch from OFF position to II (HEAD) position?

    Yes:  Go to  8.

    No:  Replace the body integrated unit.

  8. CHECK DAYTIME RUNNING LIGHT RESISTOR. 
    1. Turn the ignition switch to OFF.
    2. Check the daytime running light resistor. Refer to LIGHTING SYSTEM>DAY TIME RUNNING RESISTOR>INSPECTION .

    Does the daytime running light resistor normal?

    Yes:  Go to  9.

    No:  Replace the daytime running light resistor. Refer to LIGHTING SYSTEM>DAY TIME RUNNING RESISTOR .

  9. CHECK HARNESS. 
    1. Disconnect the connectors of body integrated unit, daytime running light relay, daytime running light resistor, and headlight.
    2. Check each harness.

    Is harness normal?

    Yes:  Replace the body integrated unit. Refer to SECURITY AND LOCKS>BODY INTEGRATED UNIT .

    No:  Repair or replace the harness.

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