FRONT POWER SEAT CONTROL SYSTEM Power Seat Position is not Memorized

DESCRIPTION

When the seat memory SET switch and a seat memory switch (seat memory switch 1, seat memory switch 2 or seat memory switch 3) are pressed simultaneously, the outer mirror control ECU commands the front power seat switch through CAN communication to record each position value.

WIRING DIAGRAM

for LHD:

B001ASIE15

for RHD:

B001ASIE16

CAUTION / NOTICE / HINT

Note

First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

PROCEDURE


  1. CHECK FRONT POWER SEAT CONTROL FUNCTION


    1. Check that each function of the power seat operates normally by using the front power seat switches.

      OK
      Each function of power seat operates normally by using seat switches.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK SEAT MEMORY SWITCH FUNCTION


    1. Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation.

      Note


      • The seat position will not be recorded if the seat memory SET switch and 2 or more of the seat memory switches (for example, seat memory switch 1 and seat memory switch 2) are pressed simultaneously.

      • If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

      OK
      Seat memory switch function operates normally.

    OK

    END

    NG

  3. CHECK COMBINATION METER FUNCTION


    1. When the engine switch is on (IG) and the shift lever is in P, check that the combination meter shows that the shift lever is in P.

      OK
      Meter shows that shift lever is in P.

    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

  4. READ VALUE USING GTS (SEAT MEMORY SWITCH)


    1. Check the Data List for proper functioning of the seat memory switch.

      Driver Seat
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      SET Switch Seat memory SET switch signal / ON or OFF

      ON: Seat memory SET switch on

      OFF: Seat memory SET switch off

      		 -
      M1 Switch Seat memory switch 1 signal / ON or OFF

      ON: Seat memory switch 1 on

      OFF: Seat memory switch 1 off

      		 -
      M2 Switch Seat memory switch 2 signal / ON or OFF

      ON: Seat memory switch 2 on

      OFF: Seat memory switch 2 off

      		 -
      M3 Switch Seat memory switch 3 signal / ON or OFF

      ON: Seat memory switch 3 on

      OFF: Seat memory switch 3 off

      		 -
      OK
      On GTS screen, each item changes between ON and OFF according to above chart.

    OK

    REPLACE FRONT POWER SEAT SWITCH Click here

    NG

  5. INSPECT SEAT MEMORY SWITCH


    1. B0019GNE04

      Remove the seat memory switch Click here.

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

      Standard Resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      8 (M1) - 1 (E) Seat memory switch 1 pressed Below 1 Ω
      6 (M2) - 1 (E) Seat memory switch 2 pressed Below 1 Ω
      3 (M3) - 1 (E) Seat memory switch 3 pressed Below 1 Ω
      2 (MRY) - 1 (E) Seat memory SET switch pressed Below 1 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      1 (M1) - 8 (E) Seat memory switch 1 pressed Below 1 Ω
      3 (M2) - 8 (E) Seat memory switch 2 pressed Below 1 Ω
      6 (M3) - 8 (E) Seat memory switch 3 pressed Below 1 Ω
      7 (MRY) - 8 (E) Seat memory SET switch pressed Below 1 Ω

    NG

    REPLACE SEAT MEMORY SWITCH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH)


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the I41*1 or I38*2 outer mirror control ECU connector.

    2. Disconnect the m4*1 or m1*2 seat memory switch connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      I41-2 (M1) - m4-8 (M1) Always Below 1 Ω
      I41-3 (M2) - m4-6 (M2) Always Below 1 Ω
      I41-4 (M3) - m4-3 (M3) Always Below 1 Ω
      I41-1 (MM) - m4-2 (MRY) Always Below 1 Ω
      I41-7 (GND) - m4-1 (E) Always Below 1 Ω
      I41-2 (M1) - Body ground Always 10 kΩ or higher
      I41-3 (M2) - Body ground Always 10 kΩ or higher
      I41-4 (M3) - Body ground Always 10 kΩ or higher
      I41-1 (MM) - Body ground Always 10 kΩ or higher
      I41-7 (GND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      I38-2 (M1) - m1-1 (M1) Always Below 1 Ω
      I38-3 (M2) - m1-3 (M2) Always Below 1 Ω
      I38-4 (M3) - m1-6 (M3) Always Below 1 Ω
      I38-1 (MM) - m1-7 (MRY) Always Below 1 Ω
      I38-7 (GND) - m1-8 (E) Always Below 1 Ω
      I38-2 (M1) - Body ground Always 10 kΩ or higher
      I38-3 (M2) - Body ground Always 10 kΩ or higher
      I38-4 (M3) - Body ground Always 10 kΩ or higher
      I38-1 (MM) - Body ground Always 10 kΩ or higher
      I38-7 (GND) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK OUTER MIRROR CONTROL ECU (OPERATION)


    1. After replacing the outer mirror control ECU, check that the front power seat control functions operate normally using the front seat switches and seat memory switch.

      OK
      Front power seat control functions operate normally.

    OK

    END (OUTER MIRROR CONTROL ECU WAS DEFECTIVE)

    NG

    REPLACE FRONT POWER SEAT SWITCH Click here