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Home >> Toyota >> 2021 >> C-HR XLE >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/O AFS) - Diagnostic Codes & Circuit Tests >> LIGHTING SYSTEM (w/o AFS) >> Front Fog Light Circuit [08/2020 - 12/2021] >> Procedure

Front Fog Light Circuit [08/2020 - 12/2021]: Procedure

  1. CHECK OPERATION (TAILLIGHTS) 
    1. Check the operation of the taillights.

      OK

      Taillights operate normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 12/2021] 

    Result: 

    OK 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    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.

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Front Fog Light Relay Front fog lights ON/OFF Light control switch in tail position

      Body Electrical > Main Body > Active Test 

      Tester Display
      Front Fog Light Relay

      OK

      Front fog lights come on.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2020 - 12/2021] 

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - BATTERY) 
    1. Remove the FR FOG relay from the No. 4 relay block assembly.
    2. Measure the voltage according to the value(s) in the chart below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Relay terminal 5 -Body ground Always 11 to 14 V
      GTY920964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 4 Relay Block Assembly
      *a FR FOG relay terminal

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FR FOG RELAY INPUT VOLTAGE) 
    1. Measure the voltage according to the value(s) in the chart below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Relay terminal 2 - Body ground Light control switch TAIL or HEAD 11 to 14 V
      GTY920963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 4 Relay Block Assembly
      *a FR FOG relay terminal

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  5

  5. INSPECT FR FOG RELAY 
    1. Inspect the FR FOG relay.

      Refer to ON-VEHICLE INSPECTION [02/2017 - ]

      Result

      Result  Proceed to
      OK (for TMMT Made) A
      OK (for TMC Made) B
      NG C

    Result: 

    B 

    See step  7

    Result: 

    C 

    REPLACE FR FOG RELAY 

    Result: 

    A 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - FOG LIGHT ASSEMBLY RH AND FOG LIGHT ASSEMBLY LH) 
    1. Disconnect the B15*1 or B13*2 fog light assembly LH connector.
      1. *1: for LED Fog Light
      2. *1: for Halogen Fog Light
    2. Disconnect the B16*1 or B14*2 fog light assembly RH connector.
      1. *1: for LED Fog Light
      2. *1: for Halogen Fog Light
    3. Measure the voltage according to the value(s) in the chart below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay terminal 3 - B15-2 (B)*1 Always Below 1 Ω
      Relay terminal 3 - B13-1 (B)*2 Always Below 1 Ω
      Relay terminal 3 - B16-2 (B)*1 Always Below 1 Ω
      Relay terminal 3 - B14-1 (B)*2 Always Below 1 Ω
      Relay terminal 3 or B15-2 (B) - Body ground*1 Always 10 kΩ or higher
      Relay terminal 3 or B13-1 (B) - Body ground*2 Always 10 kΩ or higher
      Relay terminal 3 or B16-2 (B) - Body ground*1 Always 10 kΩ or higher
      Relay terminal 3 or B14-1 (B) - Body ground*2 Always 10 kΩ or higher
      1. *1: for LED Fog Light
      2. *1: for Halogen Fog Light

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    See step  8

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - FOG LIGHT ASSEMBLY RH AND FOG LIGHT ASSEMBLY LH) 
    1. Disconnect the B16 fog light assembly LH connector.
    2. Disconnect the B15 fog light assembly RH connector.
    3. Measure the voltage according to the value(s) in the chart below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay terminal 3 - B16-2 (B) Always Below 1 Ω
      Relay terminal 3 - B15-2 (B) Always Below 1 Ω
      Relay terminal 3 or B16-2 (B) - Body ground Always 10 kΩ or higher
      Relay terminal 3 or B15-2 (B) - 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 HARNESS AND CONNECTOR (FR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3A instrument panel junction block assembly connector.
    2. Measure the voltage according to the value(s) in the chart below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay terminal 1 - 3A-52 Always Below 1 Ω
      Relay terminal 1 or 3A-52 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [08/2020 - 12/2021]

    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 chart below.
      GTY747368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-52 - MB-7 (FFGO) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [08/2020 - 12/2021] 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [08/2020 - 12/2021] 

  10. CHECK HARNESS AND CONNECTOR (FR FOG RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3D instrument panel junction block assembly connector.
    2. Measure the voltage according to the value(s) in the chart below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Relay terminal 2 - 3D-11 Always Below 1 Ω
      Relay terminal 2 or 3D-11 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [08/2020 - 12/2021] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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