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

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DESCRIPTION

The driver side seat memory switch sends signals to the position control ECU (driver side) to memorize given seat position via the multiplex network master switch assembly. The passenger side seat memory switch signals the position control ECU (passenger side) to memorize a given seat position via the front multiplex network door ECU RH. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The seat memory switch sends signals to the position control ECU to return to one of the memorized positions.

WIRING DIAGRAM


B107931E07


B111134E01


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.


    Result: 
    Result
    		Proceed to
    NG (Driver side seat memory function does not operate)
    		A
    NG (Passenger side seat memory function does not operate)
    		B
    OK
    		C



B
Go to step 10

C
NORMAL
A


3.CHECK COMBINATION METER FUNCTION (PNP SWITCH)

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

    OK:
    Meter shows that shift lever is on P.



NG
GO TO COMBINATION METER
OK


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

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

    Multiplex network master switch assembly:

    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    Seat Memory Set Switch
    		SET switch signal / ON or OFF
    		ON: SET switch is ON
    OFF: SET switch is OFF
    		-
    Seat Memory Switch M1
    		M1 switch signal / ON or OFF
    		ON: M1 switch is ON
    OFF: M1 switch is OFF
    		-
    Seat Memory Switch M2
    		M2 switch signal / ON or OFF
    		ON: M2 switch is ON
    OFF: M2 switch is OFF
    		-
    Seat Memory Switch M3
    		M3 switch signal / ON or OFF
    		ON: M3 switch is ON
    OFF: M3 switch is OFF
    		-

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



NG
Go to step 6
OK


5.READ VALUE OF INTELLIGENT TESTER (SEAT MEMORY SWITCH (DRIVER SIDE))

  1. Check the Data List for proper functioning of the seat memory switch, the front power seat switch, engine switch and PNP switch.

    Position control ECU & switch assembly (Driver side):

    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    M1 Switch
    		M1 switch signal / ON or OFF
    		ON: M1 switch is ON
    OFF: M1 switch is OFF
    		-
    M2 Switch
    		M2 switch signal / ON or OFF
    		ON: M2 switch is ON
    OFF: M2 switch is OFF
    		-
    M3 Switch
    		M3 switch signal / ON or OFF
    		ON: M3 switch is ON
    OFF: M3 switch is OFF
    		-
    SET Switch
    		SET switch signal / ON or OFF
    		ON: SET switch is ON
    OFF: SET switch is OFF
    		-
    Slide Position
    		Seat sliding position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Reclining Position
    		Seatback position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Front Vertical Position
    		Seat front vertical position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Lifter Position
    		Seat lifter position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    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
    		-
    Ignition Switch
    		Engine Switch status (IG) /
    ON or OFF
    		ON: Engine switch on (IG)
    OFF: Engine switch off
    		-
    P Switch
    		Shift lever position P signal /
    ON or OFF
    		ON: Shift lever on P
    OFF: Shift lever not on P
    		-

    OK:
    On tester screen, each item is displayed according to above chart.



NG
REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
OK

REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY (DRIVER SIDE) 

6.INSPECT SEAT MEMORY SWITCH (DRIVER SIDE)
B107936E04

  1. Remove the switch.

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    2 (M1) - 5 (E)
    		M1 switch pressed
    		Below 1 Ω
    3 (M2) - 5 (E)
    		M2 switch pressed
    		Below 1 Ω
    4 (M3) - 5 (E)
    		M3 switch pressed
    		Below 1 Ω
    1 (MRY)*1 - 5 (E)
    		SET switch pressed
    		Below 1 Ω
    1 (MMRY)*2 - 5 (E)
    		SET switch pressed
    		Below 1 Ω



NG
REPLACE SEAT MEMORY SWITCH (DRIVER SIDE)
OK


7.CHECK WIRE HARNESS (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY - SEAT MEMORY SWITCH (DRIVER SIDE))
B107945E02

  1. Disconnect the S5 or R9, and S2 or R2 switch connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    LHD:
    Tester Connection
    		Specified Condition
    S5-3 (MM) - S2-1 (MRY)
    		Below 1 Ω
    S5-13 (M1) - S2-2 (M1)
    		Below 1 Ω
    S5-17 (M2) - S2-3 (M2)
    		Below 1 Ω
    S5-18 (M3) - S2-4 (M3)
    		Below 1 Ω
    RHD:
    Tester Connection
    		Specified Condition
    R9-3 (MM) - R2-1 (MMRY)
    		Below 1 Ω
    R9-13 (M1) - R2-2 (M1)
    		Below 1 Ω
    R9-17 (M2) - R2-3 (M2)
    		Below 1 Ω
    R9-18 (M3) - R2-4 (M3)
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


8.CHECK WIRE HARNESS (SEAT MEMORY SWITCH (DRIVER SIDE) - BODY GROUND)
B107942E02

  1. Disconnect the S2 or R2 switch connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    LHD:
    Tester Connection
    		Specified Condition
    S2-5 (E) - Body ground
    		Below 1 Ω
    RHD:
    Tester Connection
    		Specified Condition
    R2-5 (E) - Body ground
    		Below 1 Ω



OK
REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
NG


9.CHECK WIRE HARNESS (FRONT MULTIPLEX NETWORK DOOR ECU (DRIVER SIDE) - SEAT MEMORY SWITCH (DRIVER SIDE))
B107943E04

  1. Disconnect the O3 or N4 ECU connector.

  1. Disconnect the S2 or R2 switch connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    LHD:
    Tester Connection
    		Specified Condition
    O3-26 (MSWE) - S2-5 (E)
    		Below 1 Ω
    S2-1 (GND) - Body ground
    		Below 1 Ω
    RHD:
    Tester Connection
    		Specified Condition
    N4-26 (MSWE) - R2-5 (E)
    		Below 1 Ω
    R2-1 (GND) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE FRONT MULTIPLEX NETWORK DOOR ECU (DRIVER SIDE) 

10.CHECK COMBINATION METER FUNCTION (PNP SWITCH)

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

    OK:
    Meter shows that shift lever is on P.



NG
GO TO COMBINATION METER
OK


11.READ VALUE OF INTELLIGENT TESTER (SEAT MEMORY SWITCH (PASSENGER SIDE))

  1. Check the Data List for proper functioning of the seat memory switch, the front power seat switch, engine switch and PNP switch.

    Position control ECU & switch assembly (passenger side):

    Item
    		Measurement Item / Range (Display)
    		Normal Condition
    		Diagnostic Note
    M1 Switch
    		M1 switch signal / ON or OFF
    		ON: M1 switch is ON
    OFF: M1 switch is OFF
    		-
    M2 Switch
    		M2 switch signal / ON or OFF
    		ON: M2 switch is ON
    OFF: M2 switch is OFF
    		-
    M3 Switch
    		M3 switch signal / ON or OFF
    		ON: M3 switch is ON
    OFF: M3 switch is OFF
    		-
    SET Switch
    		SET switch signal / ON or OFF
    		ON: SET switch is ON
    OFF: SET switch is OFF
    		-
    Slide Position
    		Seat sliding position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Reclining Position
    		Seatback position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Front Vertical Position
    		Seat front vertical position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    Lifter Position
    		Seat lifter position /
    MIN: -4096, MAX: 4096
    		Within -4096 to 4096
    		-
    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
    		-
    Ignition Switch
    		Engine Switch status (IG) /
    ON or OFF
    		ON: Engine switch on (IG)
    OFF: Engine switch off
    		-
    P Switch
    		Shift lever position P signal /
    ON or OFF
    		ON: Shift lever on P
    OFF: Shift lever not on P
    		-

    OK:
    On tester screen, each item is displayed according to above chart.



OK
REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY (PASSENGER SIDE)
NG


12.INSPECT SEAT MEMORY SWITCH (PASSENGER SIDE)
B107935E03

  1. Remove the switch.

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    2 (1) - 5 (E)
    		M1 switch pressed
    		Below 1 Ω
    3 (2) - 5 (E)
    		M2 switch pressed
    		Below 1 Ω
    4 (3) - 5 (E)
    		M3 switch pressed
    		Below 1 Ω
    1 (MMRY)*1 - 5 (E)
    		SET switch pressed
    		Below 1 Ω
    1 (MRY)*2 - 5 (E)
    		SET switch pressed
    		Below 1 Ω



NG
REPLACE SEAT MEMORY SWITCH RH
OK


13.CHECK WIRE HARNESS (FRONT MULTIPLEX NETWORK DOOR ECU (PASSENGER SIDE) - SEAT MEMORY SWITCH (PASSENGER SIDE))
B107943E05

  1. Disconnect the N4 or O3 ECU connector.

  1. Disconnect the R2 or S2 switch connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    LHD:
    Tester Connection
    		Specified Condition
    N4-25 (MM) - R2-1 (MMRY)
    		Below 1 Ω
    N4-22 (M1) - R2-2 (M1)
    		Below 1 Ω
    N4-23 (M2) - R2-3 (M2)
    		Below 1 Ω
    N4-24 (M3) - R2-4 (M3)
    		Below 1 Ω
    N4-26 (MSWE) - R2-5 (E)
    		Below 1 Ω
    N4-1 (GND) - Body ground
    		Below 1 Ω
    RHD:
    Tester Connection
    		Specified Condition
    O3-25 (MM) - S2-1 (MRY)
    		Below 1 Ω
    O3-22 (M1) - S2-2 (M1)
    		Below 1 Ω
    O3-23 (M2) - S2-3 (M2)
    		Below 1 Ω
    O3-24 (M3) - S2-4 (M3)
    		Below 1 Ω
    O3-26 (MSWE) - S2-5 (E)
    		Below 1 Ω
    O3-1 (GND) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE FRONT MULTIPLEX NETWORK DOOR ECU (PASSENGER SIDE)