LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2006 >> LS 430 >> Repair and Diagnosis >> Body & Frame >> Seats >> Front Power Seat Control System - Diagnostics >> Terminals Of Ecu
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu

  1. CHECK DRIVER SEAT ECU 
    Fig 1: Identifying Terminals Of Driver Seat ECU
    G03000963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D27 and D28 ECU connectors.
    2. Measure the voltage of the wire harness side connectors.

      Standard: 

      DRIVER SEAT ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (D27-6) - Body ground W-B - Body ground Ground Always Below 1 V
      SGND (D28-1) - Body ground BR - Body ground Ground Always Below 1 V
      IG (D28-10) - SGND (D28-1) R-L - BR Ignition switch Ignition switch OFF --> ON 0 V --> 10 to 14 V
      +B (D27-14) - GND (D27-6) B-R - W-B Battery Always 10 to 14V
      SYSB (D28-9) - SGND (D28-1) V-Y - BR Battery Always 10 to 14V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the D27 and D28 ECU connectors.
    4. Initialize the front power seat (SEE INITIALIZATION  ).
    5. Measure the voltage of connectors.

    Standard: 

    Fig 2: Driver Seat ECU Terminals Reference Chart
    G03000964Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the result is not as specified, replace the power seat or the ECU may have a malfunction.

  2. CHECK DRIVER DOOR ECU 
    Fig 3: Identifying Terminals Of Driver Door ECU
    G03000965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D25 ECU connector.
    2. Measure the voltage of the wire harness side connector.

      Standard: 

      DRIVER DOOR ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (D25-1) - Body ground W-B - Body ground Ground Always Below 1 V
      CPUB (D25-4) - GND (D25-1) V-Y - W-B Battery (ECU power source) Always 10 to 14 V
      SIG (D25-5) - GND (D25-1) R-L - W-B Ignition power supply Ignition switch OFF --> ON 0 V --> 10 to 14 V
      BDR (D25-6) - GND (D25-1) R - W-B Battery (ECU power source) Always 10 to 14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the D25 ECU connector.
    4. Measure the voltage of the D24 ECU connector.

    Standard: 

    DRIVER DOOR ECU TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    MM (D24-29) - MSWE (D24-28) GR - BR-W Memory SET switch signal Memory SET switch OFF Memory SET switch ON 10 to 14 V Below 1 V
    M1 (D24-21) -MSWE (D24-28) P - BR-W Memory 1 switch signal Memory 1 switch OFF Memory 1 switch ON 10 to 14 V Below 1 V
    M2 (D24-20) - MSWE (D24-28) P-B - BR-W Memory 2 switch signal Memory 2 switch OFF Memory 2 switch ON 10 to 14 V Below 1 V
    M3 (D24-9) - MSWE (D24-28) P-L - BR-W Memory 3 switch signal Memory 3 switch OFF Memory 3 switch ON 10 to 14 V Below 1 V

    If the result is not as specified, replace the driver door ECU may have a malfunction.

scientia non olet · About LEMON Manuals