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Daytime Running Light Relay Circuit [10/2015 - ]: Procedure

  1. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for HID Headlight or LED Headlight A
      for Halogen Headlight B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. CHECK OPERATION (PARKING LIGHTS) 
    1. Check the operation of the parking lights.

      OK

      The parking lights operate normally.

    Result: 

    NG 

    GO TO PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] )

    Result: 

    OK 

    See step  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Active Test.
    5. Perform the Active Test according to the display on the Techstream.
      MAIN BODY

      Tester Display Test Part Control Range Diagnostic Note
      Daytime Running Light Daytime running lights ON/OFF -

      OK

      The daytime running lights illuminate.

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] )

    Result: 

    NG 

    See step  4

  4. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Using a voltmeter, check the signal reading of the engine room junction block assembly (Refer to ON-VEHICLE INSPECTION [10/2015 - ] ).

      OK

      Output signal reading is normal.

    Result: 

    NG 

    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK) 

    (Refer to ON-VEHICLE INSPECTION [10/2015 - ] )

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND) 
    1. Remove the engine room junction block assembly from the engine room relay block and junction block assembly.

      Refer to REMOVAL [10/2014 - ]

      GTY597612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without engine room junction block assembly connected
      (Engine Room Relay Block and Junction Block Assembly)      		 - -
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A-1 (BATT) - Body ground Always 11 to 14 V
      B-1 (ALT) - Body ground Always 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1F-3 (GND1) - Body ground Always Below 1 Ω
      1G-4 (GND2) - Body ground Always Below 1 Ω

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1F-6 (DRLS) - 3D-25 Always Below 1 Ω
      1F-6 (DRLS) or 3D-25 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly (Refer to REMOVAL [10/2014 - ] ).
      GTY566998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3D-25 - MB-25 (DRL) Always Below 1 Ω

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - HEADLIGHT ASSEMBLY) 
    1. for HID Headlight:
      1. Disconnect the A14 headlight assembly LH connector.
      2. Disconnect the A42 headlight assembly RH connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        1G-8 (LDRL) - A14-1 (B) Always Below 1 Ω
        1G-8 (LDRL) - A42-1 (B) Always Below 1 Ω
        1G-8 (LDRL), A14-1 (B) or A42-1 (B) - Body ground Always 10 kΩ or higher
    2. for LED Headlight:
      1. Disconnect the A49 headlight assembly LH connector.
      2. Disconnect the A53 headlight assembly RH connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        1G-8 (LDRL) - A49-2 (B) Always Below 1 Ω
        1G-8 (LDRL) - A53-2 (B) Always Below 1 Ω
        1G-8 (LDRL), A49-2 (B) or A53-2 (B) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Replace the engine room junction block assembly with a new or known good one (Refer to REMOVAL [10/2014 - ] ).
    2. Check that the daytime running lights operate normally.

      OK

      The daytime running lights operate normally.

    Result: 

    OK 

    END (ENGINE ROOM JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    (Refer to REMOVAL [10/2014 - ] )

  10. CHECK OPERATION (HIGH BEAM HEADLIGHTS) 
    1. Check the operation of the high beam headlights.

      OK

      The high beam headlights operate normally.

    Result: 

    NG 

    GO TO PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] )

    Result: 

    OK 

    See step  11

  11. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Active Test.
    5. Perform the Active Test according to the display on the Techstream.
      MAIN BODY

      Tester Display Test Part Control Range Diagnostic Note
      Daytime Running Light Daytime running lights ON/OFF -

      OK

      The daytime running lights illuminate.

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] )

    Result: 

    NG 

    See step  12

  12. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Using a voltmeter, check the signal reading of the engine room junction block assembly (Refer to ON-VEHICLE INSPECTION [10/2015 - ] ).

      OK

      Output signal reading is normal.

    Result: 

    NG 

    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (RESULTS OF SIGNAL READING CHECK) 

    (Refer to ON-VEHICLE INSPECTION [10/2015 - ] )

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY POWER SOURCE AND BODY GROUND) 
    1. Remove the engine room junction block assembly from the engine room relay block and junction block assembly.

      Refer to REMOVAL [10/2014 - ]

      GTY597612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without engine room junction block assembly connected
      (Engine Room Relay Block and Junction Block Assembly)      		 - -
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A-1 (BATT) - Body ground Always 11 to 14 V
      B-1 (ALT) - Body ground Always 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1F-3 (GND1) - Body ground Always Below 1 Ω
      1G-4 (GND2) - Body ground Always Below 1 Ω

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3D instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1F-14 (DRLS) - 3D-25 Always Below 1 Ω
      1F-14 (DRLS) or 3D-25 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly (Refer to REMOVAL [10/2014 - ] ).
      GTY566998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3D-25 - MB-25 (DRL) Always Below 1 Ω

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    OK 

    See step  16

  16. CHECK ENGINE ROOM JUNCTION BLOCK ASSEMBLY 
    1. Replace the engine room junction block assembly with a new or known good one (Refer to REMOVAL [10/2014 - ] ).
    2. Check that the daytime running lights operate normally.

      OK

      The daytime running lights operate normally.

    Result: 

    OK 

    END (ENGINE ROOM JUNCTION BLOCK ASSEMBLY WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    (Refer to REMOVAL [10/2014 - ] )

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