Front Power Seat Control System (W/ Memory) Terminals Of Ecu

  1. CHECK FRONT POWER SEAT SWITCH (for LHD)

  1. CHECK FRONT POWER SEAT SWITCH (for RHD)

  1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Front Power Seat Control System (W/ Memory) -- Terminals Of Ecu



CHECK FRONT POWER SEAT SWITCH (for LHD)

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Seat.Front Power Seat Control System (W/ Memory).Front Power Seat Control System (W/ Memory) Terminals Of Ecu

  1. Disconnect the b4 and b5 connectors from the front power seat switch LH.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    b4-1 (GND2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    b4-2 (GND) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    b4-6 (+B2) - b4-1 (GND2)
    		SB - W-B
    		Power source
    		Always
    		11 to 14 V
    b4-7 (+B) - b4-2 (GND)
    		W - W-B
    		Power source
    		Always
    		11 to 14 V
    b5-12 (SYSB) - b4-2 (GND)
    		P - W-B
    		System power source
    		Always
    		11 to 14 V
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the b4 and b5 switch connectors.

  4. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    b4-3 (SLD+) - b4-2 (GND)
    		L - W-B
    		Sliding motor signal (forward)
    		Slide switch off
    		Below 1 V
    Slide switch on (Forward)
    		11 to 14 V
    b4-4 (SLD-) - b4-2 (GND)
    		GR - W-B
    		Sliding motor signal (rearward)
    		Slide switch off
    		Below 1 V
    Slide switch on (Rearward)
    		11 to 14 V
    b4-5 (FRV-) - b4-2 (GND)
    		R - W-B
    		Front vertical motor signal (downward)
    		Front vertical switch off
    		Below 1 V
    Front vertical switch on (Downward)
    		11 to 14 V
    b4-8 (FRV+) - b4-2 (GND)
    		B - W-B
    		Front vertical motor signal (upward)
    		Front vertical switch off
    		Below 1 V
    Front vertical switch on (Upward)
    		11 to 14 V
    b4-9 (RCL+) - b4-2 (GND)
    		P - W-B
    		Reclining motor signal (forward)
    		Reclining switch off
    		Below 1 V
    Reclining switch on (Forward)
    		11 to 14 V
    b4-11 (RCL-) - b4-2 (GND)
    		LG - W-B
    		Reclining motor signal (rearward)
    		Reclining switch off
    		Below 1 V
    Reclining switch on (Rearward)
    		11 to 14 V
    b4-10 (LFT+) - b4-2 (GND)
    		V - W-B
    		Lifter motor signal (upward)
    		Lifter switch off
    		Below 1 V
    Lifter switch on (Upward)
    		11 to 14 V
    b4-12 (LFT-) - b4-2 (GND)
    		G - W-B
    		Lifter motor signal (downward)
    		Lifter switch off
    		Below 1 V
    Lifter switch on (Downward)
    		11 to 14 V
    b5-1 (SGND) - b4-2 (GND)
    		BR - W-B
    		Ground
    		Always
    		Below 1 Ω
    b5-3 (SSFV) - b5-1 (SGND)
    		R - BR
    		Front vertical position signal
    		Front vertical function operating
    		4.5 to 4.8 V
    b5-4 (SSRL) - b5-1 (SGND)
    		P - BR
    		Lifter position signal
    		Lifter function operating
    		4.5 to 4.8 V
    b5-5 (SSRS) - b5-1 (SGND)
    		G- BR
    		Slide position signal
    		Slide function operating
    		4.5 to 4.8 V
    b5-11 (SSRR) - b5-1 (SGND)
    		V - BR
    		Reclining position signal
    		Reclining function operating
    		4.5 to 4.8 V
    If the result is not as specified, the front power seat switch may have a malfunction.

CHECK FRONT POWER SEAT SWITCH (for RHD)

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Seat.Front Power Seat Control System (W/ Memory).Front Power Seat Control System (W/ Memory) Terminals Of Ecu

  1. Disconnect the a4 and a5 connectors from the front power seat switch RH.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    a4-1 (GND2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    a4-2 (GND) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    a4-6 (+B2) - a4-1 (GND2)
    		SB - W-B
    		Power source
    		Always
    		11 to 14 V
    a4-7 (+B) - a4-2 (GND)
    		W - W-B
    		Power source
    		Always
    		11 to 14 V
    a5-12 (SYSB) - a4-2 (GND)
    		P - W-B
    		System power source
    		Always
    		11 to 14 V
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the a4 and a5 switch connectors.

  4. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    a4-3 (SLD+) - a4-2 (GND)
    		L - W-B
    		Sliding motor signal (forward)
    		Slide switch off
    		Below 1 V
    Slide switch on (Forward)
    		11 to 14 V
    a4-4 (SLD-) - a4-2 (GND)
    		GR - W-B
    		Sliding motor signal (rearward)
    		Slide switch off
    		Below 1 V
    Slide switch on (Rearward)
    		11 to 14 V
    a4-5 (FRV-) - a4-2 (GND)
    		R - W-B
    		Front vertical motor signal (downward)
    		Front vertical switch off
    		Below 1 V
    Front vertical switch on (Downward)
    		11 to 14 V
    a4-8 (FRV+) - a4-2 (GND)
    		B - W-B
    		Front vertical motor signal (upward)
    		Front vertical switch off
    		Below 1 V
    Front vertical switch on (Upward)
    		11 to 14 V
    a4-9 (RCL+) - a4-2 (GND)
    		P - W-B
    		Reclining motor signal (forward)
    		Reclining switch off
    		Below 1 V
    Reclining switch on (Forward)
    		11 to 14 V
    a4-11 (RCL-) - a4-2 (GND)
    		LG - W-B
    		Reclining motor signal (rearward)
    		Reclining switch off
    		Below 1 V
    Reclining switch on (Rearward)
    		11 to 14 V
    a4-10 (LFT+) - a4-2 (GND)
    		V - W-B
    		Lifter motor signal (upward)
    		Lifter switch off
    		Below 1 V
    Lifter switch on (Upward)
    		11 to 14 V
    a4-12 (LFT-) - a4-2 (GND)
    		G - W-B
    		Lifter motor signal (downward)
    		Lifter switch off
    		Below 1 V
    Lifter switch on (Downward)
    		11 to 14 V
    a5-1 (SGND) - a4-2 (GND)
    		BR - W-B
    		Ground
    		Always
    		Below 1 Ω
    a5-3 (SSFV) - a5-1 (SGND)
    		R - BR
    		Front vertical position signal
    		Front vertical function operating
    		4.5 to 4.8 V
    a5-4 (SSRL) - a5-1 (SGND)
    		P - BR
    		Lifter position signal
    		Lifter function operating
    		4.5 to 4.8 V
    a5-5 (SSRS) - a5-1 (SGND)
    		G - BR
    		Slide position signal
    		Slide function operating
    		4.5 to 4.8 V
    a5-11 (SSRR) - a5-1 (SGND)
    		V - BR
    		Reclining position signal
    		Reclining function operating
    		4.5 to 4.8 V
    If the result is not as specified, the front power seat switch may have a malfunction.

CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Seat.Front Power Seat Control System (W/ Memory).Front Power Seat Control System (W/ Memory) Terminals Of Ecu


Text in Illustration
*A
for LHD
*B
for RHD

  1. Remove the main body ECU (LandCruiser RM000003WBO05FX.html).

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A-30 (BECU) - Body ground
    		-
    		Power source
    		Always
    		11 to 14 V
    A-32 (IG) - Body ground
    		-
    		Power source (IG)
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    A-11 (GND) - Body ground
    		-
    		Body ground
    		Always
    		Below 1 Ω
    G63-3 (GND2) - Body ground
    		W-B - Body ground
    		Body ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Install the main body ECU (LandCruiser RM000003WBM05CX.html).

  4. Measure the voltage according to the value(s) in the table below.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    G63-25 (M1) - Body ground
    		SB - Body ground
    		Memory switch M1 signal
    		Memory switch M1 off
    		Pulse generation (See waveform 1 or 2)
    Memory switch M1 on
    		Below 1 V
    G63-26 (MM) - Body ground
    		LG - Body ground
    		Memory switch SET signal
    		Memory switch SET off
    		Pulse generation (See waveform 1 or 2)
    Memory switch SET on
    		Below 1 V
    G63-27 (M2) - Body ground
    		V - Body ground
    		Memory switch M2 signal
    		Memory switch M2 off
    		Pulse generation (See waveform 1 or 2)
    Memory switch M2 on
    		Below 1 V
    2I-27 (FLCY) - Body ground*1
    		R - Body ground
    		Front door courtesy light switch LH signal
    		Front door LH closed
    		11 to 14 V
    Front door LH open
    		Below 1 V
    2H-26 (FRCY) - Body ground*2
    		B - Body ground
    		Front door courtesy light switch RH signal
    		Front door RH closed
    		11 to 14 V
    Front door RH open
    		Below 1 V
    1. *1: for LHD
    2. *2: for RHD


    5. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Seat.Front Power Seat Control System (W/ Memory).Front Power Seat Control System (W/ Memory) Terminals Of Ecu

  5. Using an oscilloscope, check waveform 1.

    Waveform 1 (Reference)
    Item
    		Content
    Terminal No. (Symbol)
    		G63-25 (M1) - Body ground
    G63-26 (MM) - Body ground
    G63-27 (M2) - Body ground
    Tool Setting
    		5 V/DIV., 20 ms/DIV.
    Condition
    		Memory switch M1 off
    Memory switch SET off
    Memory switch M2 off


    6. Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Seat.Front Power Seat Control System (W/ Memory).Front Power Seat Control System (W/ Memory) Terminals Of Ecu

  6. Using an oscilloscope, check waveform 2.

    Waveform 2 (Reference)
    Item
    		Content
    Terminal No. (Symbol)
    		G63-25 (M1) - Body ground
    G63-26 (MM) - Body ground
    G63-27 (M2) - Body ground
    Tool Setting
    		5 V/DIV., 20 ms/DIV.
    Condition
    		Memory switch M1 off
    Memory switch SET off
    Memory switch M2 off