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Home >> Lexus >> 2021 >> LC 500 2D Coupe >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Ext) - Symptom Tests & Circuit Tests (2 Of 2) (Coupe) >> Lighting System >> Back-up Light Circuit [03/2017 - 05/2023] >> Procedure

Back-up Light Circuit [03/2017 - 05/2023]: Procedure

  1. READ VALUE USING TECHSTREAM 
    1. Start the engine.
    2. Changes the shift lever R position.
    3. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 04/2020] , or refer to DATA LIST / ACTIVE TEST [04/2020 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Back-up Light Fuse Back-up light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Back-up Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM 
    1. Start the engine.
    2. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 04/2020] , or refer to DATA LIST / ACTIVE TEST [04/2020 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

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

      Body Electrical > Power Integration No. 3 > 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. READ VALUE USING TECHSTREAM 
    1. Start the engine.
    2. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 04/2020] , or refer to DATA LIST / ACTIVE TEST [04/2020 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Back-up Light Output Signal Back-up light output condition OFF or ON OFF: Back-up light not illuminated
      ON: Back-up light illuminated      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Back-up Light Output Signal

      OK

      Display changes according to shift lever operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT ASSEMBLY - BATTERY) 
    1. Disconnect the back-up light assembly connector.
      GTY794836Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Back-up Light Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      c6-3 (B/U) - Body ground Start the engine, shift lever R position 8 to 14 V
      Start the engine, shift lever except R position Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT ASSEMBLY - BODY GROUND) 
    1. Disconnect the back-up light assembly connector.
      GTY794837Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Back-up Light Assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      c6-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BACK-UP LIGHT ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK SHIFT CONTROL ECU 
    1. Disconnect the cable from the negative (-) battery terminal.
      GTY781112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 3 Semiconductor Power Integration ECU)
    2. Disconnect the No. 3 semiconductor power integration ECU connector.
    3. Connect the cable to the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Refer to INITIALIZATION [03/2017 - 04/2020] , or refer to INITIALIZATION [04/2020 - 05/2023]

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      X99-11 (+S) - Body ground Start the engine, shift lever R position 6 V or higher
      Start the engine, shift lever except R position Below 1.5 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU - SHIFT CONTROL ECU) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    3. Disconnect the P74 shift control ECU connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      X99-11 (+S) - P74-15 (BL) Always Below 1 Ω
      X99-11 (+S) or P74-15 (BL) - Body ground Always 10 kΩ or higher
    5. Connect the cable to the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Refer to INITIALIZATION [03/2017 - 04/2020] , or refer to INITIALIZATION [04/2020 - 05/2023]

    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      X99-11 (+S) or P74-15 (BL) - Body ground Always Below 1 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK BACK-UP LIGHT ASSEMBLY 
    1. Disconnect the c6 back-up light assembly connector.
    2. Start the engine.
    3. Changes the shift lever except R position.
    4. Changes the shift lever R position.
    5. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 04/2020] , or refer to DATA LIST / ACTIVE TEST [04/2020 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Back-up Light Fuse Back-up light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Back-up Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BACK-UP LIGHT ASSEMBLY. Refer to  REMOVAL [03/2017 - ] 

    Result: 

    NG 

    See step  9

  9. CHECK MULTI-DISPLAY 
    1. Disconnect the P42 multi-display connector.
    2. Start the engine.
    3. Changes the shift lever except R position.
    4. Changes the shift lever R position.
    5. Using the Techstream, read the Data List.

      Refer to DATA LIST / ACTIVE TEST [03/2017 - 04/2020] , or refer to DATA LIST / ACTIVE TEST [04/2020 - 05/2023]

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Back-up Light Fuse Back-up light fuse Connect or Disconnect Connect: Fuse not shut off
      Disconnect: Fuse shut off      		 -

      Body Electrical > Power Integration No. 3 > Data List 

      Tester Display
      Status of Back-up Light Fuse

      OK

      The Data List value displays "Connect".

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MULTI-DISPLAY. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (BACK-UP LIGHT CIRCUIT) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the X99 No. 3 semiconductor power integration ECU connector.
    3. Disconnect the c6 back-up light assembly connector.
    4. Disconnect the P42 multi-display connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      X99-4 (L) or c6-3 (B/U) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [03/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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