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Inspection Procedure

  1. CHECK FRONT POWER SEAT OPERATION 
    1. Check that each function of the power seat operates normally by using the front power seat switches.

      Result 

      RESULT

      Result Proceed to
      All front power seat switch operations are malfunctioning except lumbar front power seat switch operation A
      Only lumbar front seat switch operation is malfunctioning B

    B:  Go to step  6

    A: Go to next step 

  2. READ VALUE OF TECHSTREAM (FRONT POWER SEAT SWITCH) 
    1. Check the DATA LIST for proper functioning of the front power seat switch.

      Position control ECU & switch assembly LH, RH 

      DATA LIST

      Tester Display Measurement Item/Range Normal Condition
      Reclining Rear Reclining switch signal (Rearward) / ON or OFF ON: Reclining switch (Rearward) is ON
      OFF: Reclining switch (Rearward) is OFF
      Reclining Front Reclining switch signal (Forward) / ON or OFF ON: Reclining switch (Forward) is ON
      OFF: Reclining switch (Forward) is OFF
      Front Vertical Down Front vertical switch signal (Downward) / ON or OFF ON: Front vertical switch (Downward) is ON
      OFF: Front vertical switch (Downward) is OFF
      Front Vertical Up Front vertical switch signal (Upward) / ON or OFF ON: Front vertical switch (Upward) is ON
      OFF: Front vertical switch (Upward) is OFF
      Lifter Switch Down Lifter switch signal (Downward) / ON or OFF ON: Lifter switch (Downward) is ON
      OFF: Lifter switch (Downward) is OFF
      Lifter Switch Up Lifter switch signal (Upward) / ON or OFF ON: Lifter switch (Upward) is ON
      OFF: Lifter switch (Upward) is OFF
      Slide Rear Sliding switch signal (Rearward) / ON or OFF ON: Sliding switch (Rearward) is ON
      OFF: Sliding switch (Rearward) is OFF
      Slide Front Sliding switch signal (Forward) / ON or OFF ON: Sliding switch (Forward) is ON
      OFF: Sliding switch (Forward) is OFF

      OK: 

      On tester screen, each item changes between ON and OFF according to above chart. 

    NG: REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY 

    OK: Go to next step 

  3. PERFORM ACTIVE TEST BY ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR) 
    1. Select the ACTIVE TEST, use Techstream to generate a control command, and then check that the power seat motors operate.

      Position control ECU & switch assembly (driver, passenger side) 

      DATA LIST

      Tester Display Test Part Control Range
      Seat Reclining Seat reclining operation FRONT/REAR
      Front Vertical Operation Seat front vertical operation UP/DOWN
      Lifter Operation Seat lifter operation UP/DOWN
      Seat Slide Operation Seat sliding operation FRONT/REAR

      OK: 

      The power seat motors operate normally. 

    NG: Go to step 4 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  4. INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) 
    1. Inspect the power seat motor (See INSPECTION  ).

      OK: 

      The power seat motor operates. 

    NG: REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR) 
    1. Disconnect the position control ECU assembly connector and power seat
    2. Measure the resistance according to table below.
      Fig 1: Checking Harness And Connector (Position Control ECU And Switch Assembly - Power Seat Motor)
      G05141803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      P58-2 (SLD+) - P54-1 Always Below 1 Ω
      P58-3 (SLD-) - P54-2 Always Below 1 Ω
      P58-4 (FRV-) - P51-2 Always Below 1 Ω
      P58-6 (FRV+) - P51-1 Always Below 1 Ω
      P58-7 (LFT+) - P52-2 Always Below 1 Ω
      P58-9 (LFT-) - P52-1 Always Below 1 Ω
      P58-8 (RCL+) - P47-2 Always Below 1 Ω
      P58-10 (RCL-) - P47-1 Always Below 1 Ω
      P58-2 (SLD+) - Body ground Always 10 kΩ or higher
      P58-3 (SLD-) - Body ground Always 10 kΩ or higher
      P58-4 (FRV-) - Body ground Always 10 kΩ or higher
      P58-6 (FRV+) - Body ground Always 10 kΩ or higher
      P58-7 (LFT+) - Body ground Always 10 kΩ or higher
      P58-9 (LFT-) - Body ground Always 10 kΩ or higher
      P58-8 (RCL+) - Body ground Always 10 kΩ or higher
      P58-10 (RCL-) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

  6. CHECK WIRE HARNESS (POWER SEAT CONTROL SWITCH - BATTERY AND BODY GROUND) 
    1. Disconnect the P49 switch connector.
    2. Measure the voltage and resistance of the wire harness side connectors.

      Standard voltage (Driver side) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Specified Condition
      P49-3 (B) - Body ground 10 to 14 V

      Standard resistance (Driver side) 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester connection Specified condition
      P49-2 (E2) - Body ground Below 1 Ω
      P49-5 (E1) - Body ground Below 1 Ω
      3. Fig 2: Identifying P49 Connector Terminals
      G05141804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  7. INSPECT POWER SEAT CONTROL SWITCH (LUMBER SUPPORT CONTROL) 
    1. Inspect the power seat control switch (See INSPECTION  ).

    NG: REPLACE POWER SEAT CONTROL SWITCH (LUMBER SUPPORT CONTROL) 

    OK: Go to next step 

  8. INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) 
    1. Inspect the power seat motor (See INSPECTION  ).

      OK: 

      The power seat motor operates. 

    NG: REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR) 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SEAT CONTROL SWITCH - POWER SEAT MOTOR) 

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