SEAT VIBRATION SYSTEM Front Air Massage Function does not Operate

DESCRIPTION

The radio receiver assembly sends switch operation signals to the position control ECU assembly via CAN communication. The position control ECU assembly that receives the signals operates the refresh seat functions by controlling the seat check valve and lumbar support pump.

WIRING DIAGRAM


  1. for Driver Seat:

    Figure 1. for LHD:

    B004SHBE03

    Figure 2. for RHD:

    B004SHBE04

  2. for Front Passenger Seat:

    Figure 3. for LHD:

    B004SHBE05

    Figure 4. for RHD:

    B004SHBE06

CAUTION / NOTICE / HINT

Note


  • The seat vibration system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.

    Click here

  • Initializing the position control ECU assembly will clear the seat position memory.

  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

Make sure to initialize the position control ECU assembly after replacing the seat assembly or any related parts (including removal and installation).

PROCEDURE


  1. CHECK MALFUNCTIONING PARTS


    1. Check the problem symptoms.

      Result
      Result Proceed to
      Driver seat malfunctioning A
      Passenger seat malfunctioning B

    B

    CHECK MALFUNCTIONING PARTS, COMPONENT AND AREA Click here

    A

  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 B

    B

    PERFORM ACTIVE TEST USING GTS Click here

    A

  3. INSPECT LUMBAR SUPPORT PUMP SUB-ASSEMBLY (for Driver Seat)


    1. Remove the lumbar support pump sub-assembly (for Driver Seat).

      Click here

    2. Inspect the lumbar support pump sub-assembly (for Driver Seat).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LUMBAR SUPPORT PUMP SUB-ASSEMBLY (for Driver Seat) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT PUMP SUB-ASSEMBLY (for Driver Seat))


    1. for LHD:


      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

    2. for RHD:


      1. Disconnect the Q8 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (SEAT CHECK VALVE (for Driver Seat) - BATTERY AND BODY GROUND)


    1. for LHD:


      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

    2. for RHD:


      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 Power switch off 11 to 14 V
        Q10-3 (SYSB) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - SEAT CHECK VALVE (for Driver Seat))


    1. for LHD:


      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

    2. for RHD:


      1. Disconnect the Q8 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

    OK

    REPLACE POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Driver Seat / Active Test.

    5. B004SFNC01
      *a Example
      *1 B5
      *2 B4
      *3 B3
      *4 B2
      *5 B1
      *6 C4
      *7 C3
      *8 C2
      *9 C1

      Perform the Active Test according to the display on the GTS.


      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
      Result
      Proceed to
      NEXT

    NEXT

    CHECK REFRESHING SEAT Click here
    CHECK REFRESHING SEAT Click here
    CHECK REFRESHING SEAT Click here

  8. CHECK MALFUNCTIONING PARTS, COMPONENT AND AREA


    1. Check that each function of the refreshing seat operates normally.

      Click here

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

    B

    PERFORM ACTIVE TEST USING GTS Click here

    A

  9. INSPECT LUMBAR SUPPORT PUMP SUB-ASSEMBLY (for Front Passenger Seat)


    1. Remove the lumbar support pump sub-assembly (for Front Passenger Seat).

      Click here

    2. Inspect the lumbar support pump sub-assembly (for Front Passeger Seat).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE LUMBAR SUPPORT PUMP SUB-ASSEMBLY (for Front Passenger Seat) Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - LUMBAR SUPPORT PUMP SUB-ASSEMBLY (for Front Passenger Seat))


    1. for LHD:


      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

    2. for RHD:


      1. Disconnect the Q28 No. 2 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (SEAT CHECK VALVE (for Front Passenger Seat) - BATTERY AND BODY GROUND)


    1. for LHD:


      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

    2. for RHD:


      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 Always Below 1 Ω
        Q30-3 (SYSB) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (NO. 2 POSITION CONTROL ECU ASSEMBLY - SEAT CHECK VALVE (for Front Passenger Seat))


    1. for LHD:


      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

    2. for RHD:


      1. Disconnect the Q28 No. 2 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

    OK

    REPLACE NO. 2 POSITION CONTROL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Passenger Seat / Active Test.

    5. B004SFNC01
      *a Example
      *1 B5
      *2 B4
      *3 B3
      *4 B2
      *5 B1
      *6 C4
      *7 C3
      *8 C2
      *9 C1

      Perform the Active Test according to the display on the GTS.


      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
      Result
      Proceed to
      NEXT

    NEXT

    CHECK REFRESHING SEAT Click here
    CHECK REFRESHING SEAT Click here
    CHECK REFRESHING SEAT Click here