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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Restraints >> Seat Belts >> Seat Belt Warning System - Diagnostics & Symptom Tests >> Seat Belt Warning System >> Seat Belt Status Display Malfunction [12/2019 - 10/2022] >> Procedure

Seat Belt Status Display Malfunction [12/2019 - 10/2022]: Procedure

  1. CHECK SEAT BELT WARNING FUNCTION 
    1. Check the seat belt warning function.

      Refer to ON-VEHICLE INSPECTION [12/2019 - 11/2023] 

      GTY874280Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for 60/40 Split Seat Type (Rear No. 1 Seat)
      *1 Seat Belt Status Display (Combination Meter Assembly)
      *a Driver Seat
      *b Front Passenger Seat
      *c Rear No. 1 LH Seat
      *d Rear No. 1 Center Seat
      *e Rear No. 1 RH Seat
      *f Rear No. 2 LH Seat
      *g Rear No. 2 Center Seat
      *h Rear No. 2 RH Seat

      Result

      Result Proceed to
      The seat belt status display (all seats) operates normally A
      The seat belt status display (all seats) does not operate normally B
      The driver seat belt status display does not operate normally C
      The front passenger seat belt status display does not operate normally
      The seat belt status display (rear No. 1 and rear No. 2 seats) does not operate normally D
      The seat belt status display (rear No. 1 RH seat) does not operate normally E
      The seat belt status display (rear No. 1 center seat) does not operate normally* F
      The seat belt status display (rear No. 1 LH seat) does not operate normally G
      The seat belt status display (rear No. 2 RH seat) does not operate normally H
      The seat belt status display (rear No. 2 center seat) does not operate normally I
      The seat belt status display (rear No. 2 LH seat) does not operate normally J
      1. *: for 60/40 Split Seat Type (Rear No. 1 Seat)

    Result: 

    A 

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

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    D 

    See step  3

    Result: 

    E 

    See step  4

    Result: 

    F 

    See step  7

    Result: 

    G 

    See step  10

    Result: 

    H 

    See step  13

    Result: 

    I 

    See step  17

    Result: 

    J 

    See step  22

    Result: 

    C 

    See step  2

  2. CHECK FRONT SEAT BELT WARNING LIGHT 
    1. Check the front seat belt warning light operates normally.

      Refer to ON-VEHICLE INSPECTION [12/2019 - 11/2023] 

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    GO TO OTHER DIAGNOSTIC PROCEDURE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - ]  

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

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      RR Door Courtesy SW Rear door courtesy light switch RH ON or OFF ON: Rear door RH open
      OFF: Rear door RH closed      		 -
      RL Door Courtesy SW Rear door courtesy light switch LH ON or OFF ON: Rear door LH open
      OFF: Rear door LH closed      		 -

      Body Electrical > Main Body > Data List 

      Tester Display
      RR Door Courtesy SW
      RL Door Courtesy SW

      OK

      ON or OFF appears on the GTS screen according to the rear door condition

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    GO TO LIGHTING SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 11/2023] 

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

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Right Seat Buckle / Occupant Detection Warning Switch Rear No. 1 seat belt RH buckle switch OFF or ON OFF: Rear No. 1 seat belt RH fastened
      ON: Rear No. 1 seat belt RH unfastened      		 -

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Rear Right Seat Buckle / Occupant Detection Warning Switch

      Result

      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition OK
      ON or OFF appears on the GTS screen according to the rear seat belt condition NG

    Result: 

    NG 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  5

  5. INSPECT REAR SEAT INNER BELT ASSEMBLY RH 

    for Captain Seat Type (Rear No. 1 Seat): Refer to INSPECTION [12/2019 - ]

    for 60/40 Split Seat Type (Rear No. 1 Seat): Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR SEAT INNER BELT ASSEMBLY RH 

    for Captain Seat Type (Rear No. 1 Seat): Refer to REMOVAL [12/2019 - ]

    for 60/40 Split Seat Type (Rear No. 1 Seat): Refer to REMOVAL [12/2019 - ]

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY RH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the H21 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR 60/40 SPLIT SEAT TYPE (REAR NO. 1 SEAT)

      Tester Connection Condition Specified Condition
      f2-1 - H21-26 (RRSB) Always Below 1 Ω
      f2-1 or H21-26 (RRSB) - Body ground Always 10 kΩ or higher
      f2-4 - Body ground Always Below 1 Ω
      FOR CAPTAIN SEAT TYPE (REAR NO. 1 SEAT)

      Tester Connection Condition Specified Condition
      f2-3 - H21-26 (RRSB) Always Below 1 Ω
      f2-3 or H21-26 (RRSB) - Body ground Always 10 kΩ or higher
      f2-5 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Center Seat Buckle / Occupant Detection Warning Switch Rear No. 1 seat belt center buckle switch OFF or ON OFF: Rear No. 1 seat belt center fastened
      ON: Rear No. 1 seat belt center unfastened      		 -

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Rear Center Seat Buckle / Occupant Detection Warning Switch

      Result

      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    A 

    See step  8

  8. INSPECT REAR SEAT INNER BELT ASSEMBLY (CENTER) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR SEAT INNER BELT ASSEMBLY (CENTER). Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY (CENTER) - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the H21 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      f3-2 - H21-25 (RCSB) Always Below 1 Ω
      f3-2 or H21-25 (RCSB) - Body ground Always 10 kΩ or higher
      f3-5 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Left Seat Buckle / Occupant Detection Warning Switch Rear No. 1 seat belt LH buckle switch OFF or ON OFF: Rear No. 1 seat belt LH fastened
      ON: Rear No. 1 seat belt LH unfastened      		 -

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Rear Left Seat Buckle / Occupant Detection Warning Switch

      Result

      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    A 

    See step  11

  11. INSPECT REAR SEAT INNER BELT ASSEMBLY LH 

    for Captain Seat Type (Rear No. 1 Seat): Refer to INSPECTION [12/2019 - ]

    for 60/40 Split Seat Type (Rear No. 1 Seat): Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR SEAT INNER BELT ASSEMBLY LH 

    for Captain Seat Type (Rear No. 1 Seat): Refer to REMOVAL [12/2019 - ]

    for 60/40 Split Seat Type (Rear No. 1 Seat): Refer to REMOVAL [12/2019 - ]

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (REAR SEAT INNER BELT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the H21 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      f6-3 - H21-24 (RLSB) Always Below 1 Ω
      f6-3 or H21-24 (RLSB) - Body ground Always 10 kΩ or higher
      f6-5 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      3rd Right Seat Buckle / Occupant Detection Warning Switch Rear No. 2 seat belt RH buckle switch OFF or ON OFF: Rear No. 2 seat belt RH fastened
      ON: Rear No. 2 seat belt RH unfastened      		 -

      Body Electrical > Combination Meter > Data List 

      Tester Display
      3rd Right Seat Buckle / Occupant Detection Warning Switch

      Result

      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    A 

    See step  14

  14. INSPECT REAR NO. 2 SEAT INNER BELT ASSEMBLY LH 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY LH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  15

  15. INSPECT REAR NO. 2 SEAT INNER BELT ASSEMBLY RH 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (REAR NO. 2 SEAT INNER BELT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the H21 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M69-1 (+) - H21-3 (RRBT) Always Below 1 Ω
      M69-1 (+) or H21-3 (RRBT) - Body ground Always 10 kΩ or higher
      M69-4 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      3rd Center Seat Buckle / Occupant Detection Warning Switch Rear No. 2 seat belt center buckle switch OFF or ON OFF: Rear No. 2 seat belt center fastened
      ON: Rear No. 2 seat belt center unfastened      		 -

      Body Electrical > Combination Meter > Data List 

      Tester Display
      3rd Center Seat Buckle / Occupant Detection Warning Switch

      Result

      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    A 

    See step  18

  18. INSPECT REAR NO. 2 SEAT INNER BELT ASSEMBLY LH 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY LH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  19

  19. INSPECT REAR NO. 2 SEAT INNER BELT ASSEMBLY RH 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY RH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  20

  20. INSPECT REAR NO. 2 SEAT INNER BELT ASSEMBLY (CENTER) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY (CENTER). Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  21

  21. CHECK HARNESS AND CONNECTOR (REAR NO. 2 SEAT INNER BELT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the H21 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M69-2 (+) - H21-23 (RCBT) Always Below 1 Ω
      M69-2 (+) or H21-23 (RCBT) - Body ground Always 10 kΩ or higher
      M69-5 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      3rd Left Seat Buckle / Occupant Detection Warning Switch Rear No. 2 seat belt LH buckle switch OFF or ON OFF: Rear No. 2 seat belt LH fastened
      ON: Rear No. 2 seat belt LH unfastened      		 -

      Body Electrical > Combination Meter > Data List 

      Tester Display
      3rd Left Seat Buckle / Occupant Detection Warning Switch

      Result

      Result Proceed to
      ON or OFF does not appear on the GTS screen according to the rear seat belt condition A
      ON or OFF appears on the GTS screen according to the rear seat belt condition B

    Result: 

    B 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    A 

    See step  23

  23. INSPECT REAR NO. 2 SEAT INNER BELT ASSEMBLY LH 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE REAR NO. 2 SEAT INNER BELT ASSEMBLY LH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  24

  24. CHECK HARNESS AND CONNECTOR (REAR NO. 2 SEAT INNER BELT ASSEMBLY LH - COMBINATION METER ASSEMBLY AND BODY GROUND) 
    1. Disconnect the H21 combination meter assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M69-3 (+) - H21-13 (RLBT) Always Below 1 Ω
      M69-3 (+) or H21-13 (RLBT) - Body ground Always 10 kΩ or higher
      M69-6 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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