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Daytime Running Light Module Check

WARNING: This page is about a different car, the 2008 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSIS PROCEDURE

Step Check Yes No
1 CHECK DTC. 
  1. Connect the Subaru Select Monitor.
  2. Read the DTC of the integrated unit.
Is DTC displayed? Perform the diagnosis according to DTC. Go to step 2.
2 CHECK INPUT SIGNAL. 
  1. Display the current data of the integrated unit.
  2. Check the following input signals.
    1. Parking brake switch
    2. Shift position
    3. Light 2
Is the input signal normal? Go to step 3. Check the defective part.
3 CHECK RELAY. 
Check the daytime running light relay.
Is the relay OK? Go to step 4. Replace the relay.
4 CHECK HARNESS.  Is the harness OK? Replace the integrated unit. Repair the harness.