FixVault
Home › Toyota › 2009 › Yaris Base, 4D Hatchback › Repair and Diagnosis › External Pages › Different car › Section 16 (Lighting System) › Lighting System › Daytime Running Light Relay Circuit › Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

Check if the headlight (low beam and high beam) is normal before performing the following procedure.

  1. PERFORM ACTIVE TEST BY TECHSTREAM (DAYTIME RUNNING LIGHT RELAY) 
    1. Select the ACTIVE TEST, use the Techstream to generate a control command, and then check that the headlight illuminates.

      Main body ECU 

      MAIN BODY ECU ACTIVE TEST

      Item Test Details Diagnostic Note
      Relay of DRL (Test Details)
      Turn daytime running light relay ON / OFF (Vehicle Condition)
      Power switch ON (IG), engine is stopped and light control switch is in off      		 -

      OK : Headlight (High beam) comes on. 

    OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

    NG : GO TO NEXT STEP 

  2. CHECK DAYTIME RUNNING LIGHT RELAY 
    1. Measure the voltage of the relay connector.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      D2-2 (E) - D2-3 (+B) Always 10 to 14 V
      D2-2 (E) - D2-12 (IG) Engine is running and parking brake is released
      2. Fig 1: Identifying Daytime Running Light Relay Connector Terminals
      G04475794Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : Go to step   4 

    OK : GO TO NEXT STEP 

  3. CHECK WIRE HARNESS (ECU - BATTERY) 
    1. Disconnect the B6 ECU connector.
      2. Fig 2: Identifying B6 ECU Connector Terminals
      G04475795Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      B6-12 (HON) - Body ground Light control switch in HEAD Below 1 V
      Light control switch not in HEAD 10 to 14 V

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

  4. CHECK WIRE HARNESS (DAYTIME RUNNING LIGHT RELAY - BODY GROUND) 
    1. Disconnect the D2 relay connector.
      2. Fig 3: Disconnecting D2 Relay Connector
      G04475796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the wire harness side connector.

      Standard resistance 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Specified Condition
      D2-2 (E) - Body ground Below 1 Ω

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK : GO TO NEXT STEP 

  5. CHECK WIRE HARNESS (DAYTIME RUNNING LIGHT RELAY - BATTERY) 
    1. Disconnect the D2 relay connector.
      2. Fig 4: Disconnecting D2 Relay Connector
      G04475797Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Specified Condition
      D2-3 (+B) - Body ground 10 to 14 V

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK : GO TO NEXT STEP 

  6. CHECK DRIVER SIDE JUNCTION BLOCK (MAIN BODY ECU) 
    Fig 5: Identifying Driver Side Junction Block (Main Body ECU) Connector Terminals
    G04475798Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Measure the voltage of the connector.

      Standard voltage 

      TESTER CONNECTION - SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      B6-3 (PWMI) - Body ground Light control switch in HEAD Below 1 V
      Engine is running and parking brake is released 10 to 14 V

    NG : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

    OK : REPAIR OR REPLACE HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK - DAYTIME RUNNING LIGHT RELAY) 

About FixVault