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Home >> Toyota >> 2021 >> RAV4 Prime XSE >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/O AFS) - Diagnostic Codes & Circuit Tests (PHEV) >> LIGHTING SYSTEM (w/o AFS) >> LO-beam Headlight does not Illuminate [06/2020 - 12/2021] >> Procedure

LO-beam Headlight does not Illuminate [06/2020 - 12/2021]: Procedure

  1. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Low Beam Headlight Low beam headlights OFF or ON -

      Body Electrical > Main Body > Active Test 

      Tester Display
      Low Beam Headlight

      OK

      Low beam headlights illuminate.

      Result

      Result Proceed to
      OK A
      NG (for LH Side) B
      NG (for RH Side) C

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2020 - ] 

    Result: 

    C 

    See step  9

    Result: 

    B 

    See step  2

  2. CHECK HEADLIGHT UNIT LH (LO TERMINAL VOLTAGE) 
    1. Disconnect the headlight unit LH connector.
      GTY911264Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Headlight Unit LH)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A62-1 (LO) - Body ground Light control switch in HEAD position 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT LH - BODY GROUND) 
    1. Disconnect the headlight unit LH connector.
      GTY911262Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Headlight Unit LH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A62-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT UNIT LH. Refer to  REMOVAL [06/2020 - 12/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. INSPECT H-LP LH RELAY 

    Refer to ON-VEHICLE INSPECTION [06/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE H-LP LH RELAY 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT UNIT LH) 
    1. Remove the H-LP LH relay.
    2. Disconnect the A62 headlight unit LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (H-LP LH relay) - A62-1 (LO) Always Below 1 Ω
      3 (H-LP LH relay) or A62-1 (LO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY) 
    1. Remove the H-LP LH relay.
      GTY510431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to H-LP LH Relay)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      2 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V
      5 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Remove the H-LP LH relay.
    2. Disconnect the 4E power distribution box assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (H-LP LH relay) - 4E-6 Always Below 1 Ω
      1 (H-LP LH relay) or 4E-6 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the power distribution box assembly.

      Refer to REMOVAL [06/2020 - 12/2021]

      GTY986009Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Power Distribution Box Assembly)      		 - -
    2. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [06/2020 - 12/2021]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      4E-6 - A-8 (HRLY) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2020 - 12/2021] 

    Result: 

    NG 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [06/2020 - 12/2021] 

  9. CHECK HEADLIGHT UNIT RH (LO TERMINAL VOLTAGE) 
    1. Disconnect the headlight unit RH connector.
      GTY911263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Headlight Unit RH)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A61-1 (LO) - Body ground Light control switch in HEAD position 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT RH - BODY GROUND) 
    1. Disconnect the headlight unit RH connector.
      GTY911261Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Headlight Unit RH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A61-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT UNIT RH. Refer to  REMOVAL [06/2020 - 12/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. INSPECT H-LP RH RELAY 

    Refer to ON-VEHICLE INSPECTION [06/2020 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE H-LP RH RELAY 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT RH) 
    1. Remove the H-LP RH relay.
    2. Disconnect the A61 headlight unit RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (H-LP RH relay) - A61-1 (LO) Always Below 1 Ω
      3 (H-LP RH relay) or A61-1 (LO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY) 
    1. Remove the H-LP RH relay.
      GTY510431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to H-LP RH Relay)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      2 (H-LP RH relay) - Body ground Ignition switch off 11 to 14 V
      5 (H-LP RH relay) - Body ground Ignition switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Remove the H-LP RH relay.
    2. Disconnect the 4E power distribution box assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (H-LP RH relay) - 4E-10 Always Below 1 Ω
      1 (H-LP RH relay) or 4E-10 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the power distribution box assembly.

      Refer to REMOVAL [06/2020 - 12/2021]

      GTY986017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Power Distribution Box Assembly)      		 - -
    2. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [06/2020 - 12/2021]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      4E-10 - A-9 (HRY2) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2020 - 12/2021] 

    Result: 

    NG 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [06/2020 - 12/2021] 

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