LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2012 >> FJ Cruiser 4WD, Part Time T/Case Control >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Front Power Seat Control System (Diagnostics - Introduction)) >> Front Power Seat Control System >> Terminals Of Ecu >> Terminals Of Ecu
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu

WARNING: This page is about a different car, the 2012 Lexus GX 460. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FRONT POWER SEAT SWITCH LH 
    Fig 1: Front Power Seat Switch LH Connector Terminal Identification
    GTY287209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    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
      b4-2 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      b4-7 (+B1) - b4-2 (GND1) W - W-B Power source Always 11 to 14 V
      b5-12 (SYSB) - b4-2 (GND1) 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 (GND1) 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 (GND1) 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 (GND1) R - W-B Front vertical motor signal (downward) Front vertical switch off Below 1 V
      Front vertical switch on (Downward) 11 to 14 V
      b4-6 (+B2) - b4-1 (GND2) SB - W-B Power source Always 11 to 14 V
      b4-8 (FRV+) - b4-2 (GND1) 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 (GND1) 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 (GND1) 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 (GND1) 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 (GND1) 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 (GND1) 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
      b5-10 (DBCL) - b4-2 (GND1) GR- W-B Buckle switch signal Engine switch off
      Driver side seat belt unfastened      		 11 to 14 V
      Engine switch off
      Driver side seat belt fastened      		 Below 1 V
      b5-9 (DRDC) - b4-2 (GND1) B- W-B Buckle switch signal Engine switch on (IG)
      Driver side seat belt unfastened      		 11 to 14 V
      Engine switch on (IG)
      Driver side seat belt fastened      		 Below 1 V

      If the result is not as specified, the front power seat switch LH may have a malfunction.

  2. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY LH 
    Fig 2: Outer Mirror Control ECU Assembly LH Connector Terminal Identification
    GTY276489Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K8 connector from the outer mirror control ECU assembly 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
      K8-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K8-14 (BDR) - K8-7 (GND) R - W-B Power source Always 11 to 14 V
      K8-5 (SIG) - K8-7 (GND) G - W-B Power source (IG) Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      K8-6 (CPUB) - K8-7 (GND) L - W-B 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 K8 ECU connector.
    4. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K8-1 (MM) - K8-13 (MSWE) LG - W-B Seat memory switch SET signal SET switch off 11 to 14 V
      SET switch on Below 1 V
      K8-2 (M1) - K8-13 (MSWE) SB - W-B Seat memory switch M1 signal M1 switch off 11 to 14 V
      M1 switch on Below 1 V
      K8-3 (M2) - K8-13 (MSWE) V - W-B Seat memory switch M2 signal M2 switch off 11 to 14 V
      M2 switch on Below 1 V

      If the result is not as specified, the outer mirror control ECU assembly LH may have a malfunction.

  3. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    Fig 3: Multiplex Network Body ECU Connector Terminal Identification
    GTY270684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the main body ECU. Refer to REMOVAL .
    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) Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω
      G46-3 (GND2) - Body ground W-B - Body ground 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. Refer to REMOVAL .
    4. Measure the voltage according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2H-27 (FLCY) - Body ground 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
scientia non olet · About LEMON Manuals