FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) > Power Seat Position is not Memorized

for Preparation Click here


DESCRIPTION

The main body ECU (multiplex network body ECU) receives seat memory switch signals from the outer mirror control ECU assembly (for driver side) via CAN communication. If the seat memory SET switch is being pressed when one of the M1, M2 or M3 switches is pressed, or if one of the M1, M2 or M3 switches is pressed within 3 seconds of pressing the seat memory SET switch, the main body ECU (multiplex network body ECU) sends a memory request signal to the position control ECU and switch assembly. After receiving the request signal, the position control ECU and switch assembly memorizes the location data of each motor.

WIRING DIAGRAM


B270913E02


INSPECTION PROCEDURE

NOTICE:
  1. The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
  2. If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.
  3. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK CAN COMMUNICATION SYSTEM

  1. Use the intelligent tester to check if the CAN communication system is functioning normally (Click here).

    OK:
    CAN communication DTC is not output.



NG
GO TO CAN COMMUNICATION SYSTEM (Click here)
OK


2.CHECK FRONT POWER SEAT CONTROL SYSTEM

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

    OK:
    Each function of the power seat operates normally by using the power seat switch.



NG
GO TO PROBLEM SYMPTOMS TABLE (Click here)
OK


3.READ VALUE USING INTELLIGENT TESTER (SEAT MEMORY 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 / Mirror L*1 or Mirror R*2 / Data List

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

    Mirror L*1 or Mirror R*2 (Outer Mirror Control ECU Assembly (for Driver Side)) 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    SET Switch
    		SET switch signal / ON or OFF
    		ON: SET switch on
    OFF: SET switch off
    		-
    M1 Switch
    		M1 switch signal / ON or OFF
    		ON: M1 switch on
    OFF: M1 switch off
    		-
    M2 Switch
    		M2 switch signal / ON or OFF
    		ON: M2 switch on
    OFF: M2 switch off
    		-
    M3 Switch
    		M3 switch signal / ON or OFF
    		ON: M3 switch on
    OFF: M3 switch off
    		-

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

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



NG
Go to step 9
OK


4.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (BUZZER)

  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
    		Test Part
    		Control Range
    		Diagnostic Note
    Buzzer
    		Buzzer operation
    		ON / OFF
    		-

OK:
Buzzer sounds normally.



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


5.REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side)

  1. Replace the outer mirror control ECU assembly (for driver side) (Click here).


NEXT


6.CHECK SEAT POSITION MEMORY FUNCTION

  1. Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation (Click here).

    NOTICE:
    1. The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
    2. If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

    OK:
    Seat position memory function operates normally.



NG
Go to step 7
OK

END (OUTER MIRROR CONTROL ECU (for Driver Side) WAS DEFECTIVE) 

7.REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

  1. Replace the position control ECU and switch assembly (Click here).


NEXT


8.CHECK SEAT POSITION MEMORY FUNCTION

  1. Perform a memory operation and check that the buzzer sounds to indicate the completion of the memory operation (Click here).

    NOTICE:
    1. The seat position will not be recorded if the SET switch and 2 or more of the seat memory switches (for example, M1 switch and M2 switch) are pressed simultaneously.
    2. If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.

    OK:
    Seat position memory function operates normally.



NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)
OK

END (POSITION CONTROL ECU AND SWITCH ASSEMBLY WAS DEFECTIVE) 

9.INSPECT SEAT MEMORY SWITCH

  1. Remove the seat memory switch (Click here).



    B235920E03
    B236453E02

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 (MRY) - 5 (E)
    		SET switch is pressed
    		Below 1 Ω
    2 (M1) - 5 (E)
    		M1 switch is pressed
    		Below 1 Ω
    3 (M2) - 5 (E)
    		M2 switch is pressed
    		Below 1 Ω
    4 (M3) - 5 (E)
    		M3 switch is pressed
    		Below 1 Ω
    1 (MRY) - 5 (E)
    		SET switch is not pressed
    		10 kΩ or higher
    2 (M1) - 5 (E)
    		M1 switch is not pressed
    		10 kΩ or higher
    3 (M2) - 5 (E)
    		M2 switch is not pressed
    		10 kΩ or higher
    4 (M3) - 5 (E)
    		M3 switch is not pressed
    		10 kΩ or higher

    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *a
    		Component without harness connected
    (Seat Memory Switch)



NG
REPLACE SEAT MEMORY SWITCH (Click here)
OK


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

  1. Disconnect the K7*1 or J8*2 outer mirror control ECU assembly (for driver side) 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
    z15-1 (MRY) - K7-1 (MM)
    		Always
    		Below 1 Ω
    z15-2 (M1) - K7-2 (M1)
    		Always
    		Below 1 Ω
    z15-3 (M2) - K7-3 (M2)
    		Always
    		Below 1 Ω
    z15-4 (M3) - K7-4 (M3)
    		Always
    		Below 1 Ω
    z15-5 (E) - K7-13 (MSWE)
    		Always
    		Below 1 Ω
    K7-7 (GND) - Body ground
    		Always
    		Below 1 Ω
    K7-1 (MM) - Body ground
    		Always
    		10 kΩ or higher
    K7-2 (M1) - Body ground
    		Always
    		10 kΩ or higher
    K7-3 (M2) - Body ground
    		Always
    		10 kΩ or higher
    K7-4 (M3) - Body ground
    		Always
    		10 kΩ or higher
    K7-13 (MSWE) - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    z17-1 (MRY) - J8-1 (MM)
    		Always
    		Below 1 Ω
    z17-2 (M1) - J8-2 (M1)
    		Always
    		Below 1 Ω
    z17-3 (M2) - J8-3 (M2)
    		Always
    		Below 1 Ω
    z17-4 (M3) - J8-4 (M3)
    		Always
    		Below 1 Ω
    z17-5 (E) - J8-13 (MSWE)
    		Always
    		Below 1 Ω
    J8-7 (GND) - Body ground
    		Always
    		Below 1 Ω
    J8-1 (MM) - Body ground
    		Always
    		10 kΩ or higher
    J8-2 (M1) - Body ground
    		Always
    		10 kΩ or higher
    J8-3 (M2) - Body ground
    		Always
    		10 kΩ or higher
    J8-4 (M3) - Body ground
    		Always
    		10 kΩ or higher
    J8-13 (MSWE) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY (for Driver Side) (Click here)