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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System (Int) - Diagnostics & Circuit Tests (2 Of 2) >> Lighting System >> Ambient Illumination Light Circuit [11/2023 - ] >> Procedure

Ambient Illumination Light Circuit [11/2023 - ]: 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
      Front Footwell Lights
      • Center Tray Illumination Light (No. 1 Instrument Panel Light Sub-assembly)
      • Front Passenger Side Tray Illumination Light (No. 1 Instrument Panel Light Sub-assembly)
      • Front Door Ambient Light LH/RH (Front Door Trim Board Sub-assembly LH/RH)
      • Rear Door Ambient Light LH/RH (Rear Door Trim Board Sub-assembly LH/RH)
      		 OFF or ON Perform the Active Test with the vehicle stopped and ignition switch ON.

      Body Electrical > Main Body > Active Test 

      Tester Display
      Front Footwell Lights

      OK

      All lights come on.

      Result

      Result Proceed to
      OK A
      NG (Center tray illumination light does not come on) B
      NG (Front passenger side tray illumination light does not come on) C
      NG (Front door ambient light LH does not come on) D
      NG (Front door ambient light RH does not come on) E
      NG (Rear door ambient light LH does not come on) F
      NG (Rear door ambient light RH does not come on) G
      NG (All lights do not come on) H

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    C 

    See step  7

    Result: 

    D 

    See step  12

    Result: 

    E 

    See step  17

    Result: 

    F 

    See step  22

    Result: 

    G 

    See step  27

    Result: 

    H 

    See step  32

    Result: 

    B 

    See step  2

  2. INSPECT CENTER TRAY ILLUMINATION LIGHT (NO. 1 INSTRUMENT PANEL LIGHT SUB-ASSEMBLY) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE CENTER TRAY ILLUMINATION LIGHT (NO. 1 INSTRUMENT PANEL LIGHT SUB-ASSEMBLY). Refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8C 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
      H68-1 (ILL-) - 8C-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8B 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
      8B-28 - H68-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - ENGINE STOP AND START ECU) 
    1. Disconnect the H66 engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-11 (B43) - H68-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. INSPECT FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT (NO. 1 INSTRUMENT PANEL LIGHT SUB-ASSEMBLY) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT (NO. 1 INSTRUMENT PANEL LIGHT SUB-ASSEMBLY). Refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8C 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
      H69-1 (ILL-) - 8C-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8B 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
      8B-28 - H69-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. CHECK HARNESS AND CONNECTOR (FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT - ENGINE STOP AND START ECU) 
    1. Disconnect the H66 engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-11 (B43) - H69-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. INSPECT FRONT DOOR AMBIENT LIGHT LH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT DOOR AMBIENT LIGHT LH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY LH). Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT LH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8C 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
      J26-1 (-) - 8C-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  16

    Result: 

    A 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT LH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8B 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
      8B-28 - J26-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT LH - ENGINE STOP AND START ECU) 
    1. Disconnect the H66 engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-11 (B43) - J26-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  17. INSPECT FRONT DOOR AMBIENT LIGHT RH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY RH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE FRONT DOOR AMBIENT LIGHT RH (FRONT DOOR TRIM BOARD SUB-ASSEMBLY RH). Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT RH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8C 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
      J10-1 (-) - 8C-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  21

    Result: 

    A 

    See step  20

  20. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT RH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8B 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
      8B-28 - J10-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  21. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT RH - ENGINE STOP AND START ECU) 
    1. Disconnect the H66 engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-11 (B43) - J10-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  22. INSPECT REAR DOOR AMBIENT LIGHT LH (REAR DOOR TRIM BOARD SUB-ASSEMBLY LH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR DOOR AMBIENT LIGHT LH (REAR DOOR TRIM BOARD SUB-ASSEMBLY LH). Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  23

  23. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT LH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8C 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
      K10-1 (-) - 8C-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  24

  24. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  26

    Result: 

    A 

    See step  25

  25. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT LH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8B 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
      8B-28 - K10-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  26. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT RH - ENGINE STOP AND START ECU) 
    1. Disconnect the H66 engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-11 (B43) - K10-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  27. INSPECT REAR DOOR AMBIENT LIGHT RH (REAR DOOR TRIM BOARD SUB-ASSEMBLY RH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR DOOR AMBIENT LIGHT RH (REAR DOOR TRIM BOARD SUB-ASSEMBLY RH). Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  28

  28. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT RH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8C 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
      K5-1 (-) - 8C-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  29

  29. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  31

    Result: 

    A 

    See step  30

  30. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT RH - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8B 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
      8B-28 - K5-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  31. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT RH - ENGINE STOP AND START ECU) 
    1. Disconnect the H66 engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-11 (B43) - K5-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  32. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8C power distribution box assembly connector.
    2. Disconnect the H68 center tray illumination light (No. 1 instrument panel light sub-assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H68-1 (ILL-) - 8C-18 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  33

  33. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  37

    Result: 

    A 

    See step  34

  34. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8B 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
      8B-28 - H68-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  35

  35. CHECK HARNESS AND CONNECTOR (POWER SOURCE - POWER DISTRIBUTION BOX ASSEMBLY) 
    1. Disconnect the 8H instrument panel junction block assembly connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      8H-1 - Body ground Always*1
      Ignition switch off*2      		 11 to 14 V

      *1: for Gasoline Model

      *2: except Gasoline Model

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  36

  36. INSPECT POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      8H-1 - 8B-28 Always Below 1 Ω
      8C-18 - MB-16 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

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

  37. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - ENGINE STOP AND START ECU) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H68-2 (ILL+) - Body ground Always 10.5 to 16 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO STOP AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  38

  38. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - ENGINE STOP AND START ECU) 
    1. Disconnect the H66 engine stop and start ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H66-11 (B43) - H68-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  39

  39. INSPECT POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      8C-18 - MB-16 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

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

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