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Low Beam Headlight Circuit [10/2015 - ]: Procedure

  1. 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
      Headlight Relay Headlight relay (Low beam headlights) ON/OFF -

      OK

      Headlight relay operates (Low beam headlights illuminate).

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

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

    Result: 

    NG 

    See step  2

  2. INSPECT H-LP RELAY 
    1. Remove the H-LP relay from the engine room relay block and junction block assembly.
    2. Measure the resistance according to the value(s) in the table below.
      GTY357503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage applied between terminals 1 and 2 Below 1 Ω

    Result: 

    NG 

    REPLACE H-LP RELAY 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (H-LP-MAIN FUSE - H-LP RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Relay terminal 2 - Body ground Always 11 to 14 V
      Relay terminal 5 - Body ground Always 11 to 14 V

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (H-LP RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH) 
    1. for Halogen Headlight:
      1. Disconnect the A11 headlight assembly LH connector.
      2. Disconnect the A38 headlight assembly RH connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        Relay terminal 3 - A11-2 (LO) Always Below 1 Ω
        Relay terminal 3 - A38-2 (LO) Always Below 1 Ω
        Relay terminal 3, A11-2 (LO) or A38-2 (LO) - Body ground Always 10 kΩ or higher
    2. for HID Headlight:
      1. Disconnect the A15 headlight assembly LH connector.
      2. Disconnect the A41 headlight assembly RH connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        Relay terminal 3 - A15-2 (LO) Always Below 1 Ω
        Relay terminal 3 - A41-2 (LO) Always Below 1 Ω
        Relay terminal 3, A15-2 (LO) or A41-2 (LO) - Body ground Always 10 kΩ or higher
    3. for LED Headlight:
      1. Disconnect the A48 headlight assembly LH connector.
      2. Disconnect the A52 headlight assembly RH connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        Relay terminal 3 - A48-1 (LO) Always Below 1 Ω
        Relay terminal 3 - A52-1 (LO) Always Below 1 Ω
        Relay terminal 3, A48-1 (LO) or A52-1 (LO) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (H-LP RELAY - 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
      Relay terminal 1 - 3D-12 Always Below 1 Ω
      Relay terminal 1 or 3D-12 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly (Refer to REMOVAL [10/2014 - ] ).
    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
      GTY559317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (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-12 - MB-15 (HRLY) Always Below 1 Ω

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

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