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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 [12/2019 - 11/2023] >> Procedure

Ambient Illumination Light Circuit [12/2019 - 11/2023]: Procedure

  1. CONFIRM MODEL 

    Result

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

    Result: 

    B 

    See step  25

    Result: 

    A 

    See step  2

  2. 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
      Interior Illumination Light1
      • Center tray illumination light (No. 1 instrument panel light sub-assembly)
      • Front passenger side tray illumination light (No. 1 instrument panel light sub-assembly)
      • Door ambient light (Door trim board sub-assembly)
      		 OFF or ON Preconditions for using the Active Test to check dimmer controlled illumination:
      • Ignition switch ON
      • Shift lever is in any position other than P

      Body Electrical > Main Body > Active Test 

      Tester Display
      Interior Illumination Light1

      OK

      Center tray illumination light, front passenger side tray illumination light and door ambient 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 (Center tray illumination light, front passenger side tray illumination light and door ambient 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  6

    Result: 

    D 

    See step  9

    Result: 

    E 

    See step  12

    Result: 

    F 

    See step  15

    Result: 

    G 

    See step  18

    Result: 

    H 

    See step  21

    Result: 

    B 

    See step  3

  3. 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 [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H68-1 (ILL-) - H44-20 (LED1) 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 (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CENTER TRAY ILLUMINATION LIGHT) 
    1. Disconnect the 4B instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-24 - H68-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  6. 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 [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H69-1 (ILL-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT) 
    1. Disconnect the 4B instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-24 - H69-2 (ILL+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. 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  10

  10. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J26-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR AMBIENT LIGHT LH) 
    1. Disconnect the 4B instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-24 - J26-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. 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  13

  13. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J10-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - FRONT DOOR AMBIENT LIGHT RH) 
    1. Disconnect the 4B instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-24 - J10-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. 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  16

  16. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K10-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - REAR DOOR AMBIENT LIGHT LH) 
    1. Disconnect the 4B instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-24 - K10-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  18. 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  19

  19. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K5-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  20

  20. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - REAR DOOR AMBIENT LIGHT RH) 
    1. Disconnect the 4B instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-24 - K5-2 (+) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  21. CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 4F 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
      4F-1 - Body ground Always*1
      Ignition switch off*2      		 11 to 14 V

      *1: for Gasoline Model

      *2: for HV Model

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  22

  22. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY864413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Instrument Panel Junction Block Assembly)    		 - -
    1. Disconnect the 4B instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4F-1 - 4B-24 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    OK 

    See step  23

  23. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AMBIENT ILLUMINATION LIGHTS) 
    1. Disconnect the H68 center tray illumination light (No. 1 instrument panel light sub-assembly) connector.
    2. Disconnect the H69 front passenger side tray illumination light (No. 1 instrument panel light sub-assembly) connector.
    3. Disconnect the J26 front door ambient light LH (front door trim board sub-assembly LH) connector.
    4. Disconnect the J10 front door ambient light RH (front door trim board sub-assembly RH) connector.
    5. Disconnect the K10 rear door ambient light LH (rear door trim board sub-assembly LH) connector.
    6. Disconnect the K5 rear door ambient light RH (rear door trim board sub-assembly RH) connector.
    7. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-24 - H68-2 (ILL+) Always Below 1 Ω
      4B-24 - H69-2 (ILL+) Always Below 1 Ω
      4B-24 - J26-2 (+) Always Below 1 Ω
      4B-24 - J10-2 (+) Always Below 1 Ω
      4B-24 - K10-2 (+) Always Below 1 Ω
      4B-24 - K5-2 (+) Always Below 1 Ω
      4B-24 - Body ground Always 10 kΩ or higher
      H68-2 (ILL+) - Body ground Always 10 kΩ or higher
      H69-2 (ILL+) - Body ground Always 10 kΩ or higher
      J26-2 (+) - Body ground Always 10 kΩ or higher
      J10-2 (+) - Body ground Always 10 kΩ or higher
      K10-2 (+) - Body ground Always 10 kΩ or higher
      K5-2 (+) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  24

  24. CHECK HARNESS AND CONNECTOR (AMBIENT ILLUMINATION LIGHTS - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H68-1 (ILL-) - H44-20 (LED1) Always Below 1 Ω
      H69-1 (ILL-) - H44-20 (LED1) Always Below 1 Ω
      J26-1 (-) - H44-20 (LED1) Always Below 1 Ω
      J10-1 (-) - H44-20 (LED1) Always Below 1 Ω
      K10-1 (-) - H44-20 (LED1) Always Below 1 Ω
      K5-1 (-) - H44-20 (LED1) Always Below 1 Ω
      H68-1 (ILL-) - Body ground Always 10 kΩ or higher
      H69-1 (ILL-) - Body ground Always 10 kΩ or higher
      J26-1 (-) - Body ground Always 10 kΩ or higher
      J10-1 (-) - Body ground Always 10 kΩ or higher
      K10-1 (-) - Body ground Always 10 kΩ or higher
      K5-1 (-) - Body ground Always 10 kΩ or higher
      H44-20 (LED1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  25. 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
      Interior Illumination Light1
      • Center tray illumination light (No. 1 instrument panel light sub-assembly)
      • Front passenger side tray illumination light (No. 1 instrument panel light sub-assembly)
      • Door ambient light (Door trim board sub-assembly)
      		 OFF or ON Preconditions for using the Active Test to check dimmer controlled illumination:
      • Ignition switch ON
      • Shift lever is in any position other than P

      Body Electrical > Main Body > Active Test 

      Tester Display
      Interior Illumination Light1

      OK

      Center tray illumination light, front passenger side tray illumination light and door ambient 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 (Center tray illumination light, front passenger side tray illumination light and door ambient 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  29

    Result: 

    D 

    See step  32

    Result: 

    E 

    See step  35

    Result: 

    F 

    See step  38

    Result: 

    G 

    See step  41

    Result: 

    H 

    See step  44

    Result: 

    B 

    See step  26

  26. 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 [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  27

  27. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - CENTER TRAY ILLUMINATION LIGHT) 
    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 [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  28

  28. CHECK HARNESS AND CONNECTOR (CENTER TRAY ILLUMINATION LIGHT - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H68-1 (ILL-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  29. 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 [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - ] 

    Result: 

    OK 

    See step  30

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      H69-2 (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 [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  31

  31. CHECK HARNESS AND CONNECTOR (FRONT PASSENGER SIDE TRAY ILLUMINATION LIGHT - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H69-1 (ILL-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  32. 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  33

  33. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - FRONT DOOR AMBIENT LIGHT LH) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      J26-2 (+) - 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 [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  34

  34. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J26-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  35. 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  36

  36. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - FRONT DOOR AMBIENT LIGHT RH) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      J10-2 (+) - 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 [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  37

  37. CHECK HARNESS AND CONNECTOR (FRONT DOOR AMBIENT LIGHT RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      J10-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  38. 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  39

  39. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - REAR DOOR AMBIENT LIGHT LH) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      K10-2 (+) - 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 [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  40

  40. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K10-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  41. 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  42

  42. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - REAR DOOR AMBIENT LIGHT RH) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      K5-2 (+) - 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 [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  43

  43. CHECK HARNESS AND CONNECTOR (REAR DOOR AMBIENT LIGHT RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      K5-1 (-) - H44-20 (LED1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  44. CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - AMBIENT ILLUMINATION LIGHTS) 
    1. Disconnect the H68 center tray illumination light (No. 1 instrument panel light sub-assembly) connector.
    2. Disconnect the H69 front passenger side tray illumination light (No. 1 instrument panel light sub-assembly) connector.
    3. Disconnect the J26 front door ambient light LH (front door trim board sub-assembly LH) connector.
    4. Disconnect the J10 front door ambient light RH (front door trim board sub-assembly RH) connector.
    5. Disconnect the K10 rear door ambient light LH (rear door trim board sub-assembly LH) connector.
    6. Disconnect the K5 rear door ambient light RH (rear door trim board sub-assembly RH) connector.
    7. 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
      H69-2 (ILL+) - Body ground Always 10.5 to 16 V
      J26-2 (+) - Body ground Always 10.5 to 16 V
      J10-2 (+) - Body ground Always 10.5 to 16 V
      K10-2 (+) - Body ground Always 10.5 to 16 V
      K5-2 (+) - 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 [12/2019 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    OK 

    See step  45

  45. CHECK HARNESS AND CONNECTOR (AMBIENT ILLUMINATION LIGHTS - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H44 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H68-1 (ILL-) - H44-20 (LED1) Always Below 1 Ω
      H69-1 (ILL-) - H44-20 (LED1) Always Below 1 Ω
      J26-1 (-) - H44-20 (LED1) Always Below 1 Ω
      J10-1 (-) - H44-20 (LED1) Always Below 1 Ω
      K10-1 (-) - H44-20 (LED1) Always Below 1 Ω
      K5-1 (-) - H44-20 (LED1) Always Below 1 Ω
      H68-1 (ILL-) - Body ground Always 10 kΩ or higher
      H69-1 (ILL-) - Body ground Always 10 kΩ or higher
      J26-1 (-) - Body ground Always 10 kΩ or higher
      J10-1 (-) - Body ground Always 10 kΩ or higher
      K10-1 (-) - Body ground Always 10 kΩ or higher
      K5-1 (-) - Body ground Always 10 kΩ or higher
      H44-20 (LED1) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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