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Home >> Toyota >> 2020 >> Mirai >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Seats >> Front Power Seat Control System (W/ Memory) - Diagnostic Codes & Symptom Tests >> FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) >> Power Seat Position is not Memorized [06/2015 - ] >> Procedure

Power Seat Position is not Memorized [06/2015 - ]: Procedure

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

      Refer to OPERATION CHECK [06/2015 - ]

      OK

      Each function of the power seat operates normally using the front power seat switch LH.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2015 - ] 

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH LH) 
    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 / Mirror L / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Mirror L > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Seat Memory Switch1 M1 switch ON or OFF ON: M1 switch on
      OFF: M1 switch off      		 -
      Seat Memory Switch2 M2 switch ON or OFF ON: M2 switch on
      OFF: M2 switch off      		 -
      Seat Memory Set SW SET switch ON or OFF ON: SET switch on
      OFF: SET switch off      		 -

      Body Electrical > Mirror L > Data List 

      Tester Display
      Seat Memory Switch1
      Seat Memory Switch2
      Seat Memory Set SW

      OK

      ON or OFF is displayed on the Techstream according to the table above.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  3

  3. PERFORM ACTIVE TEST USING TECHSTREAM (BUZZER) 
    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. Read the Data List according to the display on the Techstream.

      Body Electrical > Driver Seat > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Buzzer Buzzer operation OFF/ON -

      Body Electrical > Driver Seat > Active Test 

      Tester Display
      Buzzer

      OK

      Buzzer sounds normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FRONT POWER SEAT SWITCH LH. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  4

  4. REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) 
    1. Temporarily replace the outer mirror control ECU assembly (driver door) with a new or known good one.

      Refer to REMOVAL [06/2015 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION 
    1. Check that the seat position memory and restoring function.

      Refer to OPERATION CHECK [06/2015 - ]

      OK

      Seat position memory and restoring function operate normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) WAS DEFECTIVE) 

    Result: 

    NG 

    See step  6

  6. REPLACE FRONT POWER SEAT SWITCH LH 
    1. Temporarily replace the front power seat switch LH with a new or known good one.

      Refer to REMOVAL [06/2015 - 11/2018] , or refer to REMOVAL [11/2018 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. CHECK SEAT POSITION MEMORY AND RESTORING FUNCTION 
    1. Check that the seat position memory and restoring function.

      Refer to OPERATION CHECK [06/2015 - ]

      OK

      Seat position memory and restoring function operate normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (FRONT POWER SEAT SWITCH LH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

  8. INSPECT SEAT MEMORY SWITCH LH 
    1. Remove the seat memory switch LH.

      Refer to REMOVAL [06/2015 - ]

    2. Inspect the seat memory switch LH.

      Refer to INSPECTION [06/2015 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SEAT MEMORY SWITCH LH. Refer to  REMOVAL [06/2015 - ] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) - SEAT MEMORY SWITCH LH - BODY GROUND) 
    1. Disconnect the L10 outer mirror control ECU assembly (driver door) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L10-1 (MM) - N2-8 (MRY) Always Below 1 Ω
      L10-1 (MM) - Body ground Always 10 kΩ or higher
      N2-8 (MRY) - Body ground Always 10 kΩ or higher
      L10-2 (M1) - N2-4 (M1) Always Below 1 Ω
      L10-2 (M1) - Body ground Always 10 kΩ or higher
      N2-4 (M1) - Body ground Always 10 kΩ or higher
      L10-3 (M2) - N2-3 (M2) Always Below 1 Ω
      L10-3 (M2) - Body ground Always 10 kΩ or higher
      N2-3 (M2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR). Refer to  REMOVAL [06/2015 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS AND CONNECTOR 

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