FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System) > Power Seat does not Return to Memorized Position

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DESCRIPTION

When the driver side M1, M2 or M3 switch is pressed, the multiplex network master switch assembly controls the position control ECU (via the multiplex communication line) to drive each motor until the seat reaches the memorized position. When the passenger side M1, M2 or M3 switch is pressed, the front multiplex network door ECU (passenger side) controls the position control ECU (via the multiplex communication line) to drive each motor until the seat reaches the memorized position.

INSPECTION 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
OK


2.CHECK SEAT MEMORY SWITCH FUNCTION (SEAT POSITION MEMORY FUNCTION)

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

    NOTICE:
    1. The seat position will not be recorded if the SET switch and 2 or more of the memory switches (for example, M1 and M2) 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 memory switch function operates normally.



NG
GO TO PROBLEM SYMPTOMS TABLE
OK


3.CHECK SEAT MEMORY SWITCH FUNCTION (SEAT RESTORING OPERATION)

  1. Under each of the following conditions, check that the seat restoring operation operates by pressing the M1, M2 or M3 switch.

    1. The engine switch is on (IG) and the shift lever is on P.
    2. The engine switch is off, a door is opened and the M1, M2 or M3 switch is pressed within 30 seconds.

    Result: 
    Result
    		Proceed to
    Seat restoring operation does not operate for both conditions
    		A
    Seat restoring operation operates under either condition
    		B



B
REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY
A


4.READ VALUE OF INTELLIGENT TESTER (SEAT MEMORY SWITCH)

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

    Position control ECU & switch assembly (driver side):

    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    Memory No1
    		Driving position memorized with M1 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Memory No2
    		Driving position memorized with M2 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Memory No3
    		Driving position memorized with M3 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Seat Memory No1
    		Seat position memorized with M1 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Seat Memory No2
    		Seat position memorized with M2 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Seat Memory No3
    		Seat position memorized with M3 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-


    Position control ECU & switch assembly (passenger side):

    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    Memory No1
    		Passenger seat position memorized with M1 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Memory No2
    		Passenger seat position memorized with M2 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Memory No3
    		Passenger seat position memorized with M3 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Seat Memory No1
    		Seat position memorized with M1 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Seat Memory No2
    		Seat position memorized with M2 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-
    Seat Memory No3
    		Seat position memorized with M3 switch /
    MEM or NOT MEM
    		MEM: Memorized
    NOT MEM: Not memorized
    		-

    OK:
    On tester screen, each item changes between MEM and NOT MEM according to above chart.



NG
GO TO PROBLEM SYMPTOMS TABLE
OK


5.READ VALUE OF INTELLIGENT TESTER (SEAT POSITION MEMORY)

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

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

    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    Slide Pos Mem No1
    		Seat sliding position memorized with M1 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Reclining Pos Mem No1
    		Seatback position memorized with M1 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Frnt Vtcl Pos Mem No1
    		Front vertical position memorized with M1 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Lifter Pos Mem No1
    		Lifter position memorized with M1 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Slide Pos Mem No2
    		Seat sliding position memorized with M2 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Reclining Pos Mem No2
    		Seatback position memorized with M2 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Frnt Vtcl Pos Mem No2
    		Front vertical position memorized with M2 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Lifter Pos Mem No2
    		Lifter position memorized with M2 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Slide Pos Mem No3
    		Seat sliding position memorized with M3 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Reclining Pos Mem No3
    		Seatback position memorized with M3 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Frnt Vtcl Pos Mem No3
    		Front vertical position memorized with M3 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Lifter Pos Mem No3
    		Lifter position memorized with M3 switch /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-


    Result: 
    Result
    		Proceed to
    At least one seat position memory item is displayed
    		A
    No seat memory position items are displayed
    		B



B
REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY
A


6.CHECK POSITION CONTROL ECU & SWITCH ASSEMBLY

  1. Check if the malfunction disappears when a normally functioning position control ECU & switch assembly is installed.

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



NG
REPLACE FRONT SEAT FRAME WITH ADJUSTER
OK

REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY