DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/ AFS) - Diagnostic Codes (2 Of 2), Symptom Tests & Circuit Tests >> LIGHTING SYSTEM (w/ AFS) >> Back-up Light Circuit [11/2023 - ] >> Procedure

Back-up Light Circuit [11/2023 - ]: Procedure

  1. READ VALUE USING GTS 
    1. Turn the ignition switch to ON.
    2. Move the shift lever to R.
    3. Read the Data List according to the display on the GTS.

      Body Electrical > Power Distribution Box > Data List 

      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Back-up Light Fuse Shut Off Status Back-up light fuse shut off status OFF or ON OFF: Fuse has no shut off history
      ON: Fuse has shut off history      		 -

      Body Electrical > Power Distribution Box > Data List 

      Tester Display
      Back-up Light Fuse Shut Off Status

      OK

      The Data List value displays "OFF".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  2

  2. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Power Distribution Box > Data List 

      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Back-up Light Input Signal Back-up light input OFF or ON OFF: Shift lever in any position other than R
      ON: Shift lever in R      		 -

      Body Electrical > Power Distribution Box > Data List 

      Tester Display
      Back-up Light Input Signal

      OK

      Display changes according to shift lever operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8J power distribution box assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      8J-1 - 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  4

  4. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the W7 rear light assembly RH connector.
    2. Disconnect the W8 rear light assembly LH connector.
    3. Disconnect the 8G power distribution box assembly connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W7-1 (B) - 8G-38 Always Below 1 Ω
      W8-1 (B) - 8G-38 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W7-3 (E) - Body ground Always Below 1 Ω
      W8-3 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the H67 hybrid vehicle control ECU connector.
    2. Disconnect the 8B 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
      H67-49 (BL) - 8B-29 Always Below 1 Ω
      H67-49 (BL) or 8B-29 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HYBRID VEHICLE CONTROL ECU (OUTPUT VOLTAGE) 
    GTY1178896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Power Distribution Box Assembly)
    1. Connect the H67 hybrid vehicle control ECU connector.
    2. Connect the 8B power distribution box assembly connectors.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      8B-29 - Body ground Ignition switch off, reverse (R) not selected Below 1 V
      8B-29 - Body ground Ignition switch ON, reverse (R) selected 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2023 - ] 

  8. CHECK REAR LIGHT ASSEMBLY RH 
    1. Disconnect the W7 rear light assembly RH connector.
    2. Turn the ignition switch to ON.
    3. Move the shift lever to R.
    4. Read the Data List according to the display on the GTS.

      Body Electrical > Power Distribution Box > Data List 

      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Back-up Light Fuse Shut Off Status Back-up light fuse shut off status OFF or ON OFF: Fuse has no shut off history
      ON: Fuse has shut off history      		 -

      Body Electrical > Power Distribution Box > Data List 

      Tester Display
      Back-up Light Fuse Shut Off Status

      OK

      The Data List value displays "OFF".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR LIGHT ASSEMBLY RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    See step  9

  9. CHECK REAR LIGHT ASSEMBLY LH 
    1. Disconnect the W8 rear light assembly LH connector.
    2. Turn the ignition switch to ON.
    3. Move the shift lever to R.
    4. Read the Data List according to the display on the GTS.

      Body Electrical > Power Distribution Box > Data List 

      Tester Display Measurement Item Normal Condition Reference Value Diagnostic Note
      Back-up Light Fuse Shut Off Status Back-up light fuse shut off status OFF or ON OFF: Fuse has no shut off history
      ON: Fuse has shut off history      		 -

      Body Electrical > Power Distribution Box > Data List 

      Tester Display
      Back-up Light Fuse Shut Off Status

      OK

      The Data List value displays "OFF".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE REAR LIGHT ASSEMBLY LH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8G power distribution box assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W7-1 (B), W8-1 (B) or 8G-38 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

Diesel-Data.com