Daytime Running Light Module Check

Wiring diagram: 

Headlight system and daytime running light system Ref. to WIRING SYSTEM>HEADLIGHT SYSTEM AND DAYTIME RUNNING LIGHT SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK FUSE  .
   1. Turn the ignition switch to OFF.
   2. Check the fuse on the upstream of the daytime running light relay.

   Is the fuse OK?

   Yes:  Go to  2.

   No:  Replace the fuse.

2. CHECK RELAY  .

   Check the daytime running light relay. Ref. to LIGHTING SYSTEM>RELAY AND FUSE>INSPECTION .

   Is the relay OK?

   Yes:  Go to  3.

   No:  Replace the relay.

3. CHECK BODY INTEGRATED UNIT  .

   Read the DTC of [Body Control] using the Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is DTC displayed?

   Yes:  Perform the diagnosis according to the DTC. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .

   No:  Go to  4.

4. CHECK CURRENT DATA  .

   Display the following items using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   • [EPB operating status]
   • [Shift Position]
   • [Lighting II Switch Input]

   Is the input signal normal?

   Yes:  Go to  5.

   No:  Check the defective part.

5. 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 [Daytime Running Light (Alternate System) Output] data using Subaru Select Monitor. Ref. to BODY CONTROL (DIAGNOSTICS)>DATA MONITOR .

   Does the display of [Daytime Running Light (Alternate System) Output] switch between [OFF] ←→ [ON] when the lighting switch is switched from the OFF position to the II (HEAD) position?

   Yes:  Go to  6.

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

6. CHECK DAYTIME RUNNING LIGHT ILLUMINATION  .
   1. Disconnect the headlight connector.
   2. Apply battery voltage to the DRL terminal input of the headlight unit.

   Terminals 

   No  : 12 (+) - No. 16 (-):

   Does the daytime running light illuminate?

   Yes:  Go to  7.

   No:  Replace the headlight. Ref. to LIGHTING SYSTEM>HEADLIGHT ASSEMBLY .

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

      Connector & terminal 

      (B287) No. 5 - (B225) No. 14:

      (B487) No. 12 - (B225) No. 17:

      (B477) No. 12 - (B225) No. 17:

   Is harness normal?

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

   No:  Repair or replace the harness.