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Home >> Lexus >> 2022 >> LS 500h RWD >> Repair and Diagnosis >> Accessories & Equipment >> Seats >> Seat Vibration System - Diagnostics (2 Of 2) & Symptom Tests >> Seat Vibration System >> Front Air Massage Function does not Operate [10/2023 - ] >> Procedure

Front Air Massage Function does not Operate [10/2023 - ]: Procedure

  1. CHECK MALFUNCTIONING PARTS 
    1. Check the problem symptoms.

      Result

      Result  Proceed to
      Driver seat malfunctioning A
      Passenger seat malfunctioning B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  2

  2. CHECK MALFUNCTIONING PARTS, COMPONENT AND AREA 
    1. Check that each function of the refreshing seat operates normally.

      Result

      Result  Proceed to
      All refreshing functions do not operate A
      One or more refreshing functions do not operate (w/ Front LiDAR Sensor) B
      One or more refreshing functions do not operate (w/o Front LiDAR Sensor) C

    Result: 

    B 

    See step  7

    Result: 

    C 

    See step  8

    Result: 

    A 

    See step  3

  3. INSPECT LUMBAR SUPPORT PUMP SUB-ASSEMBLY (LH) 
    1. Remove the lumbar support pump sub-assembly (LH).

      Refer to REMOVAL [10/2023 - ]

    2. Inspect the lumbar support pump sub-assembly (LH).

      Refer to INSPECTION [10/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE LUMBAR SUPPORT PUMP SUB-ASSEMBLY (LH). Refer to  REMOVAL [10/2023 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT PUMP SUB-ASSEMBLY (LH)) 
    1. Disconnect the Q28 position control ECU assembly connector.
    2. Disconnect the S10 lumbar support pump sub-assembly LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q28-4 (POM) - S10-1 Always Below 1 Ω
      Q28-3 (POMG) - S10-2 Always Below 1 Ω
      Q28-4 (POM) or S10-1 - Other terminals and body ground Always 10 kΩ or higher
      Q28-3 (POMG) or S10-2 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (SEAT CHECK VALVE (LH) - BATTERY AND BODY GROUND) 
    1. Disconnect the S12 lumbar support adjuster assembly LH connector.
    2. Disconnect the Q30 seat check with hose valve LH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S12-1 (GND) - Body ground Always Below 1 Ω
      Q30-1 (GND) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      S12-3 (SYSB) - Body ground Power switch off 11 to 14 V
      Q30-3 (SYSB) - Body ground Power switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - SEAT CHECK VALVE (LH)) 
    1. Disconnect the Q28 position control ECU assembly connector.
    2. Disconnect the S12 lumbar support adjuster assembly LH connector.
    3. Disconnect the Q30 seat check with hose valve LH connector.
    4. Disconnect the S11 seatback check with bracket valve LH connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q28-7 (LIN) - S12-5 Always Below 1 Ω
      Q28-7 (LIN) - Q30-5 Always Below 1 Ω
      Q28-7 (LIN) or S12-5 - Other terminals and body ground Always 10 kΩ or higher
      Q28-7 (LIN) or Q30-5 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Driver Seat / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Driver Seat > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Refresh B1 Seatback bladder assembly OFF/ON -
      Refresh B2 Seatback bladder assembly OFF/ON -
      Refresh B3 Seatback bladder assembly OFF/ON -
      Refresh B4 Seatback bladder assembly OFF/ON -
      Refresh B5 Seatback bladder assembly OFF/ON -
      Refresh C1 Seat cushion bladder assembly OFF/ON -
      Refresh C2 Seat cushion bladder assembly OFF/ON -
      Refresh C3 Seat cushion bladder assembly OFF/ON -
      Refresh C4 Seat cushion bladder assembly OFF/ON -

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B1

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B2

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B3

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B4

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B5

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C1

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C2

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C3

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C4
      GTY820893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Example
      *1 B5
      *2 B4
      *3 B3
      *4 B2
      *5 B1
      *6 C4
      *7 C3
      *8 C2
      *9 C1

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    CHECK REFRESHING SEAT 

    Refer to PARTS LOCATION [10/2017 - ]

    Refer to INSPECTION [10/2017 - ]

    Refer to REPAIR [10/2017 - ]

  8. PERFORM ACTIVE TEST USING GTS 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Driver Seat / Active Test.
    5. Perform the Active Test according to the display on the Techstream.
      GTY820893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Example
      *1 B5
      *2 B4
      *3 B3
      *4 B2
      *5 B1
      *6 C4
      *7 C3
      *8 C2
      *9 C1

      Body Electrical > Driver Seat > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Refresh B1 Bladder Seatback bladder assembly OFF/ON -
      Refresh B2 Bladder Seatback bladder assembly OFF/ON -
      Refresh B3 Bladder Seatback bladder assembly OFF/ON -
      Refresh B4 Bladder Seatback bladder assembly OFF/ON -
      Refresh B5 Bladder Seatback bladder assembly OFF/ON -
      Refresh C1 Bladder Seat cushion bladder assembly OFF/ON -
      Refresh C2 Bladder Seat cushion bladder assembly OFF/ON -
      Refresh C3 Bladder Seat cushion bladder assembly OFF/ON -
      Refresh C4 Bladder Seat cushion bladder assembly OFF/ON -

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B1 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B2 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B3 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B4 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh B5 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C1 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C2 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C3 Bladder

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Refresh C4 Bladder

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    CHECK REFRESHING SEAT 

    Refer to PARTS LOCATION [10/2017 - ]

    Refer to INSPECTION [10/2017 - ]

    Refer to REPAIR [10/2017 - ]

  9. CHECK MALFUNCTIONING PARTS, COMPONENT AND AREA 
    1. Check that each function of the refreshing seat operates normally.

      Refer to OPERATION CHECK [10/2022 - ]

      Result

      Result  Proceed to
      All refreshing functions do not operate A
      One or more refreshing functions do not operate B

    Result: 

    B 

    See step  14

    Result: 

    A 

    See step  10

  10. INSPECT LUMBAR SUPPORT PUMP SUB-ASSEMBLY (RH) 
    1. Remove the lumbar support pump sub-assembly (RH).

      Refer to REMOVAL [10/2023 - ]

    2. Inspect the lumbar support pump sub-assembly (RH).

      Refer to INSPECTION [10/2017 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE LUMBAR SUPPORT PUMP SUB-ASSEMBLY (RH). Refer to  REMOVAL [10/2023 - ] 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT PUMP SUB-ASSEMBLY (RH)) 
    1. Disconnect the Q8 No. 2 position control ECU assembly connector.
    2. Disconnect the S2 lumbar support pump sub-assembly RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q8-4 (POM) - S2-1 Always Below 1 Ω
      Q8-3 (POMG) - S2-2 Always Below 1 Ω
      Q8-4 (POM) or S2-1 - Other terminals and body ground Always 10 kΩ or higher
      Q8-3 (POMG) or S2-2 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (SEAT CHECK VALVE (RH) - BATTERY AND BODY GROUND) 
    1. Disconnect the S4 lumbar support adjuster assembly RH connector.
    2. Disconnect the Q10 seat check with hose valve RH connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      S4-1 (GND) - Body ground Always Below 1 Ω
      Q10-1 (GND) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      S4-3 (SYSB) - Body ground Always Below 1 Ω
      Q10-3 (SYSB) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - SEAT CHECK VALVE (RH)) 
    1. Disconnect the Q8 No. 2 position control ECU assembly connector.
    2. Disconnect the S4 lumbar support adjuster assembly RH connector.
    3. Disconnect the Q10 seat check with hose valve RH connector.
    4. Disconnect the S3 seatback check with bracket valve RH connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q8-7 (LIN) - S4-5 Always Below 1 Ω
      Q28-7 (LIN) - Q10-5 Always Below 1 Ω
      Q8-7 (LIN) or S4-5 - Other terminals and body ground Always 10 kΩ or higher
      Q8-7 (LIN) or Q10-5 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  14. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Passenger Seat / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Passenger Seat > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Refresh B1 Seatback bladder assembly OFF/ON -
      Refresh B2 Seatback bladder assembly OFF/ON -
      Refresh B3 Seatback bladder assembly OFF/ON -
      Refresh B4 Seatback bladder assembly OFF/ON -
      Refresh B5 Seatback bladder assembly OFF/ON -
      Refresh C1 Seat cushion bladder assembly OFF/ON -
      Refresh C2 Seat cushion bladder assembly OFF/ON -
      Refresh C3 Seat cushion bladder assembly OFF/ON -
      Refresh C4 Seat cushion bladder assembly OFF/ON -

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh B1

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh B2

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh B3

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh B4

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh B5

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh C1

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh C2

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh C3

      Body Electrical > Passenger Seat > Active Test 

      Tester Display
      Refresh C4
      GTY820893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Example
      *1 B5
      *2 B4
      *3 B3
      *4 B2
      *5 B1
      *6 C4
      *7 C3
      *8 C2
      *9 C1

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    CHECK REFRESHING SEAT 

    Refer to PARTS LOCATION [10/2017 - ]

    Refer to INSPECTION [10/2017 - ]

    Refer to REPAIR [10/2017 - ]

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