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Headlight Relay Circuit [10/2015 - ]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (H-LP RELAY) 
    1. Using the Techstream, perform the Active Test.

      Refer to DATA LIST / ACTIVE TEST [12/2012 - ] .

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Headlight Relay Low beam headlight relay ON or OFF -

      Body Electrical > Main Body > Active Test 

      Tester Display
      Headlight Relay

      OK

      Headlight relay operates (low beam headlights come on).

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2012 - ]  . 

    Result: 

    NG 

    See step  2

  2. CHECK VEHICLE TYPE 
    1. Check vehicle type.
      Result Proceed to
      for Halogen Headlight A
      for LED Headlight B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  3

  3. INSPECT RUNNING LIGHT RELAY 
    1. Remove the running light relay from the No. 1 engine room relay block and junction block assembly.
    2. Inspect the running light relay.

      Refer to PROCEDURE - Step 4 .

    Result: 

    NG 

    REPLACE RUNNING LIGHT RELAY 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - BATTERY AND BODY GROUND) 
    1. Remove the running light relay from the No. 1 engine room relay block and junction block assembly.
      GTY595428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Running Light Relay)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Running light relay terminal 6 (+B) - 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
      Running light relay terminal 3 (E) - Body ground Always Below 1 Ω

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (RUNNING LIGHT RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Remove the running light relay from the No. 1 engine room relay block and junction block assembly.
    2. Disconnect the 3B instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Running light relay terminal 4 (H) - 3B-37 Always Below 1 Ω
      3B-37 - 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.
      GTY590770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to REMOVAL [12/2012 - ] .

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [12/2012 - ] .

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-15 (HRLY) - 3B-37 Always Below 1 Ω

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - ]  . 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2012 - ]  . 

  7. INSPECT HEADLIGHT RELAY (H-LP) 
    1. Remove the headlight relay from the No. 1 engine room relay block and junction block assembly.
      GTY370828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

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

    Result: 

    NG 

    REPLACE HEADLIGHT RELAY (H-LP) 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP] - BATTERY) 
    1. Remove the headlight relay from the No. 1 engine room relay block and junction block assembly.
      GTY605078Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Headlight Relay)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Headlight relay terminal 5 - Body ground Always 11 to 14 V
      Headlight relay terminal 1 - Body ground

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP] - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Remove the headlight relay from the No. 1 engine room relay block and junction block assembly.
    2. Disconnect the 3B instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Headlight relay terminal 2 - 3B-37 Always Below 1 Ω
      3B-37 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.
      GTY609193Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Refer to REMOVAL [12/2012 - ] .

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [12/2012 - ] .

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-15 (HRLY) - 3B-37 Always Below 1 Ω

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - ]  . 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2012 - ]  . 

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