FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) > One or more Power Seat Motors do not Operate

for Preparation Click here


DESCRIPTION

When a signal is input into the position control ECU and switch assembly, the ECU manages the signals received from the front power seat switch, and operates each motor. If the position control ECU and switch assembly receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the position control ECU and switch assembly receives 1 signal only.

WIRING DIAGRAM


B270912E02


B270912E03


B270933E02


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK FRONT POWER SEAT OPERATION

  1. Check that each function of the power seat operates normally by using the power seat switch (Click here).

    Result:
    Result
    		Proceed to
    One or more power seat functions (except lumber support adjustment function) do not operate
    		A
    All power seat functions do not operate
    		B
    Front vertical and lifter functions do not operate
    		C
    Only lumber support adjustment function does not operate
    		D



B
GO TO OTHER FLOW CHART (Front Power Seat does not Operate with Front Power Seat Switch) (Click here)

C
Go to step 7

D
Go to step 8
A


2.READ VALUE USING INTELLIGENT TESTER (POWER SEAT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the intelligent tester on.

  1. Enter the following menus: Body / Driver Seat / Data List.

  1. Read the Data List according to the display on the intelligent tester.

    Driver Seat (Position Control ECU and Switch Assembly) 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Reclining Rear
    		Reclining switch signal (Rearward) / ON or OFF
    		ON: Reclining switch (Rearward) on
    OFF: Reclining switch (Rearward) off
    		-
    Reclining Front
    		Reclining switch signal (Forward) / ON or OFF
    		ON: Reclining switch (Forward) on
    OFF: Reclining switch (Forward) off
    		-
    Front Vertical Down
    		Front vertical switch signal (Downward) / ON or OFF
    		ON: Front vertical switch (Downward) on
    OFF: Front vertical switch (Downward) off
    		-
    Front Vertical Up
    		Front vertical switch signal (Upward) / ON or OFF
    		ON: Front vertical switch (Upward) on
    OFF: Front vertical switch (Upward) off
    		-
    Lifter Switch Down
    		Lifter switch signal (Downward) / ON or OFF
    		ON: Lifter switch (Downward) on
    OFF: Lifter switch (Downward) off
    		-
    Lifter Switch Up
    		Lifter switch signal (Upward) / ON or OFF
    		ON: Lifter switch (Upward) on
    OFF: Lifter switch (Upward) off
    		-
    Slide Rear
    		Sliding switch signal (Rearward) / ON or OFF
    		ON: Sliding switch (Rearward) on
    OFF: Sliding switch (Rearward) off
    		-
    Slide Front
    		Sliding switch signal (Forward) / ON or OFF
    		ON: Sliding switch (Forward) on
    OFF: Sliding switch (Forward) off
    		-

    OK:
    ON or OFF is displayed on the intelligent tester according to the table above.



NG
REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)
A


3.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (POWER SEAT MOTOR)

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

  1. Perform the Active Test according to the display on the intelligent tester.

    Driver Seat (Position Control ECU and Switch Assembly) 
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Seat Reclining
    		Seat reclining operation
    		Front / OFF / Rear
    		-
    Front Vertical Operation
    		Seat front vertical operation
    		Up / OFF / Down
    		-
    Lifter Operation
    		Seat lifter operation
    		Up / OFF / Down
    		-
    Seat Slide Operation
    		Seat sliding operation
    		Front / OFF / Rear
    		-

    Result:
    Result
    		Proceed to
    The power seat functions operate normally.
    		A
    Sliding, front vertical or lifter function does not operate normally.
    		B
    Reclining function does not operate normally.
    		C



B
Go to step 4

C
Go to step 5
A

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)  

4.INSPECT SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY


    B238714E08

  1. Disconnect the X1*1, X2*1, X3*1, W1*2, W2*2 or W6*2 connector from each motor.

    1. *1: for LHD
    2. *2: for RHD

    HINT:
    Check the motor operation of applicable function.

  1. Check the operation of the slide motor.

    1. Check if the seat cushion moves smoothly when the auxiliary battery is connected to the slide motor connector terminals.

      OK:
      Measurement Condition
      		Operational Direction
      Auxiliary battery positive (+) → 4
      Auxiliary battery negative (-) → 1
      		Seat cushion spring moves forward
      Auxiliary battery positive (+) → 1
      Auxiliary battery negative (-) → 4
      		Seat cushion spring moves backward

      Text in Illustration 
      *a
      		Component without harness connected
      (Slide Motor (Separate Type Front Seat Cushion Spring Assembly))



    B238714E08

  1. Check the operation of the front vertical motor.

    1. Check if the seat cushion moves smoothly when the auxiliary battery is connected to the front vertical motor connector terminals.

      OK:
      Measurement Condition
      		Operational Direction
      Auxiliary battery positive (+) → 4
      Auxiliary battery negative (-) → 1
      		Seat cushion spring moves upward
      Auxiliary battery positive (+) → 1
      Auxiliary battery negative (-) → 4
      		Seat cushion spring moves downward

      Text in Illustration 
      *a
      		Component without harness connected
      (Front Vertical Motor (Separate Type Front Seat Cushion Spring Assembly))



    B238714E08

  1. Check the operation of the lifter motor.

    1. Check if the seat cushion moves smoothly when the auxiliary battery is connected to the lifter motor connector terminals.

      OK:
      Measurement Condition
      		Operational Direction
      Auxiliary battery positive (+) → 4
      Auxiliary battery negative (-) → 1
      		Seat cushion spring moves upward
      Auxiliary battery positive (+) → 1
      Auxiliary battery negative (-) → 4
      		Seat cushion spring moves downward

      Text in Illustration 
      *a
      		Component without harness connected
      (Lifter Motor (Separate Type Front Seat Cushion Spring Assembly))

      Result:
      Result
      		Proceed to
      NG
      		A
      OK
      		B



B
Go to step 6
A

REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY (Click here)  

5.INSPECT SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY


    B238714E08

  1. Disconnect Z1*1 or Y1*2 reclining motor connector.

    1. *1: for LHD
    2. *2: for RHD

  1. Check the operation of the reclining motor.

    1. Check if the seat back moves smoothly when the auxiliary battery is connected to the reclining motor connector terminals.

      OK:
      Measurement Condition
      		Operational Direction
      Auxiliary battery positive (+) → 4
      Auxiliary battery negative (-) → 1
      		Seat back moves forward
      Auxiliary battery positive (+) → 1
      Auxiliary battery negative (-) → 4
      		Seat back moves backward

      Text in Illustration 
      *a
      		Component without harness connected
      (Reclining Motor (Separate Type Front Seat Back Spring Assembly))



NG
REPLACE SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY (Click here)
OK


6.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)

  1. Disconnect the X4*1 or W3*2 position control ECU and switch assembly connector.

    1. *1: for LHD
    2. *2: for RHD

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

    HINT:
    Check the wire harness and connector between the position control ECU and switch assembly and applicable motor.


    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    X4-3 (SLD+) - X1-4
    		Always
    		Below 1 Ω
    X4-4 (SLD-) - X1-1
    		Always
    		Below 1 Ω
    X4-5 (FRV-) - X2-1
    		Always
    		Below 1 Ω
    X4-8 (FRV+) - X2-4
    		Always
    		Below 1 Ω
    X4-10 (LFT+) - X3-4
    		Always
    		Below 1 Ω
    X4-12 (LFT-) - X3-1
    		Always
    		Below 1 Ω
    X4-9 (RCL+) - Z1-4
    		Always
    		Below 1 Ω
    X4-11 (RCL-) - Z1-1
    		Always
    		Below 1 Ω
    X4-3 (SLD+) - Body ground
    		Always
    		10 kΩ or higher
    X4-4 (SLD-) - Body ground
    		Always
    		10 kΩ or higher
    X4-5 (FRV-) - Body ground
    		Always
    		10 kΩ or higher
    X4-8 (FRV+) - Body ground
    		Always
    		10 kΩ or higher
    X4-10 (LFT+) - Body ground
    		Always
    		10 kΩ or higher
    X4-12 (LFT-) - Body ground
    		Always
    		10 kΩ or higher
    X4-9 (RCL+) - Body ground
    		Always
    		10 kΩ or higher
    X4-11 (RCL-) - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W3-3 (SLD+) - W1-4
    		Always
    		Below 1 Ω
    W3-4 (SLD-) - W1-1
    		Always
    		Below 1 Ω
    W3-5 (FRV-) - W2-1
    		Always
    		Below 1 Ω
    W3-8 (FRV+) - W2-4
    		Always
    		Below 1 Ω
    W3-10 (LFT+) - W6-4
    		Always
    		Below 1 Ω
    W3-12 (LFT-) - W6-1
    		Always
    		Below 1 Ω
    W3-9 (RCL+) - Y1-4
    		Always
    		Below 1 Ω
    W3-11 (RCL-) - Y1-1
    		Always
    		Below 1 Ω
    W3-3 (SLD+) - Body ground
    		Always
    		10 kΩ or higher
    W3-4 (SLD-) - Body ground
    		Always
    		10 kΩ or higher
    W3-5 (FRV-) - Body ground
    		Always
    		10 kΩ or higher
    W3-8 (FRV+) - Body ground
    		Always
    		10 kΩ or higher
    W3-10 (LFT+) - Body ground
    		Always
    		10 kΩ or higher
    W3-12 (LFT-) - Body ground
    		Always
    		10 kΩ or higher
    W3-9 (RCL+) - Body ground
    		Always
    		10 kΩ or higher
    W3-11 (RCL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)  

7.CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY)

  1. Disconnect the X5*1 or W4*2 position control ECU and switch assembly connector.

    1. *1: for LHD
    2. *2: for RHD

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    X5-12 (SYSB) - Body ground
    		Power switch off
    		11 to 14 V
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W4-12 (SYSB) - Body ground
    		Power switch off
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)  

8.INSPECT LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY)

  1. Remove the lumbar support adjustment switch (power seat switch assembly) (Click here).



    B239575E08

  1. for LHD:

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

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      3 - 5
      		Hold
      		Below 1 Ω
      1 - 2
      2 - 3
      		Off
      2 - 1
      2 - 3
      		Release
      1 - 5

      Text in Illustration 
      *1
      		Hold Switch
      *2
      		Release Switch
      *a
      		Component without harness connected
      (Lumbar Support Adjustment Switch (Power Seat Switch Assembly))



    B239575E09

  1. for RHD:

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

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      1 - 5
      		Hold
      		Below 1 Ω
      2 - 3
      2 - 3
      		Off
      2 - 1
      3 - 5
      		Release
      1 - 2

      Text in Illustration 
      *1
      		Hold Switch
      *2
      		Release Switch
      *a
      		Component without harness connected
      (Lumbar Support Adjustment Switch (Power Seat Switch Assembly))



NG
REPLACE LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY) (Click here)
OK


9.INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY)


    B161051E22

  1. Disconnect Z2*1 or Y2*2 reclining motor connector.

    1. *1: for LHD
    2. *2: for RHD

  1. Check the operation of the lumbar support adjuster assembly.

    1. Check that the seat back moves smoothly when the auxiliary battery is connected to the lumbar support adjuster assembly connector terminals.

      OK:
      Measurement Condition
      		Operational Direction
      Auxiliary battery positive (+) → 1
      Auxiliary battery negative (-) → 2
      		Seat back moves forward
      Auxiliary battery positive (+) → 2
      Auxiliary battery negative (-) → 1
      		Seat back moves backward

      Text in Illustration 
      *a
      		Component without harness connected
      (Lumbar Support Adjuster Assembly (Separate Type Front Seat Back Spring Assembly))



NG
REPLACE SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY (Click here)
OK


10.CHECK HARNESS AND CONNECTOR (LUMBAR SWITCH - POSITION CONTROL ECU AND LUMBAR MOTOR)

  1. Disconnect the X4*1 or W3*2 position control ECU and switch assembly connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    X4-6 (+B2) - X6-5
    		Always
    		Below 1 Ω
    X4-1 (GND2) - X6-2
    		Always
    		Below 1 Ω
    X6-3 - Z2-1
    		Always
    		Below 1 Ω
    X6-1 - Z2-2
    		Always
    		Below 1 Ω
    X6-5 - Body ground
    		Always
    		10 kΩ or higher
    X6-2 - Body ground
    		Always
    		10 kΩ or higher
    X6-3 - Body ground
    		Always
    		10 kΩ or higher
    X6-1 - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    W3-6 (+B2) - W5-5
    		Always
    		Below 1 Ω
    W3-1 (GND2) - W5-2
    		Always
    		Below 1 Ω
    W5-3 - Y2-2
    		Always
    		Below 1 Ω
    W5-1 - Y2-1
    		Always
    		Below 1 Ω
    W5-5 - Body ground
    		Always
    		10 kΩ or higher
    W5-2 - Body ground
    		Always
    		10 kΩ or higher
    W5-3 - Body ground
    		Always
    		10 kΩ or higher
    W5-1 - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY (Click here)