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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Seats >> Front Power Seat Control System (W/ Memory) - Diagnostics - Introduction >> FRONT POWER SEAT CONTROL SYSTEM (w/ Memory) >> Terminals Of Ecu [11/2023 - ] >> Terminals Of Ecu [11/2023 - ]

Terminals Of Ecu [11/2023 - ]

  1. CHECK POSITION CONTROL ECU ASSEMBLY 
    GTY872028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the e23 and e25 position control ECU assembly connectors.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Terminal Description Condition Specified Condition
      e23-3 (+B) - Body ground Auxiliary battery power supply Ignition switch off*1
      Always*2      		 11 to 14 V
      e25-1 (IG) - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      e25-15 (SYSB) - Body ground System power source Ignition switch off*1
      Always*2      		 11 to 14 V
      e23-2 (GND) - Body ground Ground Always Below 1 Ω
      1. *1: for HV Model
      2. *2: for Gasoline Model
    3. Reconnect the e23 and e25 position control ECU assembly connectors.
    4. Measure the voltage and resistance according to the value (s) in the table below.
      Tester Connection Terminal Description Condition Specified Condition
      e23-1 (SLD+) - Body ground Slide motor signal (forward) Slide switch off Below 1 V
      Slide switch on (Forward) 11 to 14 V
      e23-5 (SLD-) - Body ground Slide motor signal (rearward) Slide switch off Below 1 V
      Slide switch on (Rearward) 11 to 14 V
      e23-6 (LFT+) - Body ground Lifter motor signal (upward) Lifter switch off Below 1 V
      Lifter switch on (Upward) 11 to 14 V
      e24-5 (LFT-) - Body ground Lifter motor signal (downward) Lifter switch off Below 1 V
      Lifter switch on (Downward) 11 to 14 V
      e23-10 (RCL+) - Body ground Reclining motor signal (forward) Reclining switch off Below 1 V
      Reclining switch on (Forward) 11 to 14 V
      e24-6 (RCL-) - Body ground Reclining motor signal (rearward) Reclining switch off Below 1 V
      Reclining switch on (Rearward) 11 to 14 V
      e23-7 (FRV+) - Body ground Front vertical motor signal (upward) Front vertical switch off Below 1 V
      Front vertical switch on (Upward) 11 to 14 V
      e24-4 (FRV-) - Body ground Front vertical motor signal (downward) Front vertical switch off Below 1 V
      Front vertical switch on (Downward) 11 to 14 V
      e23-9 (L+) - Body ground Lumbar support adjuster motor signal (forward) Lumbar support adjuster switch off Below 1 V
      Lumbar support adjuster switch on (Forward) 11 to 14 V
      e24-3 (L-) - Body ground Lumbar support adjuster motor signal (rearward) Lumbar support adjuster switch off Below 1 V
      Lumbar support adjuster switch on (Rearward) 11 to 14 V
      e25-4 (LFLF) - Body ground Front power seat switch LH (lumbar support adjuster switch (forward)) signal Lumbar support adjuster switch off 11 to 14 V
      Lumbar support adjuster switch on (Forward) Below 1 V
      e25-18 (LFLR) - Body ground Front power seat switch LH (lumbar support adjuster switch (rearward)) signal Lumbar support adjuster switch off 11 to 14 V
      Lumbar support adjuster switch on (Rearward) Below 1 Ω
      e25-9 (SLDF) - Body ground Front power seat switch LH (slide switch (forward)) signal Slide switch off 11 to 14 V
      Slide switch on (Forward) Below 1 V
      e25-23 (SLDR) - Body ground Front power seat switch LH (slide switch (rearward)) signal Slide switch off 11 to 14 V
      Slide switch on (Rearward) Below 1 V
      e25-8 (RCLF) - Body ground Front power seat switch LH (reclining switch (forward)) signal Reclining switch off 11 to 14 V
      Reclining switch on (Forward) Below 1 V
      e25-22 (RCLR) - Body ground Front power seat switch LH (reclining switch (rearward)) signal Reclining switch off 11 to 14 V
      Reclining switch on (Rearward) Below 1 V
      e25-6 (FRVU) - Body ground Front power seat switch LH (front vertical switch (upward)) signal Front vertical switch off 11 to 14 V
      Front vertical switch on (Upward) Below 1 V
      e25-20 (FRVD) - Body ground Front power seat switch LH (front vertical switch (downward)) signal Front vertical switch off 11 to 14 V
      Front vertical switch on (Downward) Below 1 V
      e25-7 (LFTU) - Body ground Front power seat switch LH (lifter switch (upward)) signal Lifter switch off 11 to 14 V
      Lifter switch on (Upward) Below 1 V
      e25-21 (LFTD) - Body ground Front power seat switch LH (lifter switch (downward)) signal Lifter switch off 11 to 14 V
      Lifter switch on (Downward) Below 1 V
      e25-10 (SSFV) - Body ground Front vertical position signal Front vertical function operating 4.8 to 5.1 V
      e25-11 (SSRR) - Body ground Reclining position signal Reclining function operating 4.8 to 5.1 V
      e25-25 (SSRL) - Body ground Lifter position signal Lifter function operating 4.8 to 5.1 V
      e25-26 (SSRS) - Body ground Slide position signal Slide function operating 4.8 to 5.1 V
      e25-12 (SGND) - Body ground Sensor ground Always Below 1 Ω
  2. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (DRIVER DOOR) 
    GTY865958Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the J23 outer mirror control ECU assembly (driver door) connector.
    2. Measure the voltage and resistance according to the value (s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Tester Connection Terminal Description Condition Specified Condition
      J23-6 (CPUB) - J23-7 (GND) Auxiliary battery power supply Ignition switch off*1
      Always*2      		 11 to 14 V
      J23-14 (BDR) - J23-7 (GND) Auxiliary battery power supply Ignition switch off*1
      Always*2      		 11 to 14 V
      J23-5 (SIG) - J23-7 (GND) Ignition power supply Ignition switch ON 11 to 14 V
      J23-5 (SIG) - J23-7 (GND) Ignition power supply Ignition switch off Below 1 V
      J23-7 (GND) - Body ground Ground Always Below 1 Ω
      1. *1: for HV Model
      2. *2: for Gasoline Model
    3. Reconnect the J23 outer mirror control ECU assembly (driver door) connector.
    4. Measure the voltage according to the value (s) in the table below.
      Tester Connection Terminal Description Condition Specified Condition
      J23-1 (MM) - J23-7 (GND) SET switch signal for seat memory switch SET switch on Below 1 V
      SET switch off 11 to 14 V
      J23-2 (M1) - J23-7 (GND) M1 switch signal for seat memory switch M1 switch on Below 1 V
      M1 switch off 11 to 14 V
      J23-3 (M2) - J23-7 (GND) M2 switch signal for seat memory switch M2 switch on Below 1 V
      M2 switch off 11 to 14 V
  3. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND POWER DISTRIBUTION BOX ASSEMBLY 
    1. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

      Refer to REMOVAL [11/2023 - ]

      GTY1177775Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage and resistance according to the value (s) in the table below.

      HINT: 

      Measure the values on the wire harness side with the connector disconnected.

      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      MB-13 (GND1) - Body ground Ground Always Below 1 Ω
      MB-14 (GND2) - Body ground Ground Always Below 1 Ω
      MB-26 (BECU) - Body ground Auxiliary battery power supply Ignition switch off 11 to 14 V
      MB-27 (IGR) - Body ground IG power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
    3. Reconnect the MB main body ECU (multiplex network body ECU) connector.
    4. Check for voltage and check pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Terminal Description Condition Specified Condition
      8G-3 (FLCY) - Body ground Front door courtesy light switch (for LH) input Front door LH open → closed Below 1 V → 11 to 14 V or pulse output (maximum 14 V)*
      8B-37 - Body ground LIN communication line Ignition switch ON Pulse generation
      1. *: Differs depending on the vehicle model
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