FixVault
Home › Lexus › 2005 › LS 430 › Repair and Diagnosis › Body & Frame › Seats › Rear Power Seat Control System - Diagnostics › Terminals Of Ecu

Terminals Of Ecu

  1. CHECK REAR LH SEAT ECU 
    Fig 1: Identifying Terminals Of Rear LH Seat ECU
    G03001016Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R25 ECU connector.
    2. Measure the voltage of the wire harness side connector.

      Standard: 

      REAR LH SEAT ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (R25-1) - GND (R25-14) B - W-B Battery Always 10 to 14 V
      GND (R25-14) - Body ground W-B - Body ground Ground Always Below 1 V
      SYSB (R25-18) - GND (R25-14) V-Y - W-B Power source Always 10 to 14 V
      SGND (R25-23) - GND (R25-14) W-B - W-B Ground Always Below 1 V

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

    3. Reconnect the R25 ECU connector.
    4. Measure the voltage of the ECU connector.

    Standard: 

    Fig 2: Rear LH Seat ECU Terminals Reference Chart
    G03001017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK REAR RH SEAT ECU 
    Fig 3: Identifying Terminals Of Rear RH Seat ECU
    G03001018Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R26 ECU connector.
    2. Measure the voltage of the wire harness side connector.

      Standard: 

      REAR RH SEAT ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      +B (R26-1) - GND (R26-14) L - W-B Battery Always 10 to 14 V
      GND (R26-14) - Body ground W-B - Body ground Ground Always Below 1 V
      SYSB (R26-18) - GND (R26-14) V-Y - W-B Power source Always 10 to 14 V
      SGND (R26-23) - GND (R26-14) W-B - W-B Ground Always Below 1 V
      SEL (R26-11) - GND (R26-14) W-B - W-B Ground Always Below 1 V

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

    3. Reconnect the R26 ECU connector.
    4. Measure the voltage of the ECU connector.

    Standard: 

    Fig 4: Rear RH Seat ECU Terminals Reference Chart
    G03001019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  3. CHECK REAR SEAT CONTROL SWITCH 
    Fig 5: Identifying Terminals Of Rear Seat Control Switch
    G03001020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P54 switch connector.
    2. Measure the voltage of each terminal of the wire harness side connector.

    Standard: 

    REAR SEAT CONTROL SWITCH TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    SYSB (P54-5) - E (P54-1) G-W - W-B Power source Always 10 to 14 V
    E (P54-1) - Body ground W-B - Body ground Ground Always Below 1 V

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

  4. CHECK PASSENGER SIDE J/B (PASSENGER SIDE J/B ECU) 
    Fig 6: Identifying Terminals Of Passenger Side J/B (Passenger Side J/B ECU)
    G03001021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the PB, PE and PG J/B connectors.
    2. Disconnect the P5 ECU connector.
    3. Measure the voltage of each terminal of the wire harness side connector.

      Standard: 

      PASSENGER SIDE J/B (PASSENGER SIDE J/B ECU) TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      MPX-B (PB-1) - GND (PG-8) R-L - W-B Battery Always 10 to 14 V
      MPX-IG (PE-3) - GND (PG-8) R-L - W-B Power source Ignition switch OFF --> ON 0V --> 10 to 14 V
      GND (PG-8) - Body ground W-B - Body ground Ground Always Below 1 V
      GND1 (P5-11) - Body ground W-B - Body ground Ground Always Below 1 V

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

    4. Reconnect the PB, PE and PG J/B connectors.
    5. Reconnect the P5 ECU connector.
    6. Measure the voltage of the connector.

    Standard: 

    PASSENGER SIDE J/B (PASSENGER SIDE J/B ECU) TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    RRSW (P5-19) - GND1 (P5-11) Y - W-B Rear seat return switch signal Rear seat return switch ON Rear seat return switch OFF Below 1 V 10 to 14 V

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

  5. CHECK REAR DOOR LH ECU 
    Fig 7: Identifying Terminals Of Rear Door LH ECU
    G03001022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R13 ECU connector.
    2. Measure the voltage of each terminal of the wire harness side connector.

      Standard: 

      REAR DOOR LH ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (R13-1) - GND (R13-6) V-Y - W-B Power supply Always 10 to 14 V
      BDR (R13-2) - GND (R13-6) R-B - W-B Power supply Always 10 to 14 V
      GND (R13-6) - Body ground W-B - Body ground Ground Always Below 1 V
      SIG (R13-26) - GND (R13-6) R-L - W-B Power supply Ignition switch OFF --> ON 0V --> 10 to 14 V

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

    3. Reconnect the R13 ECU connector.
    4. Measure the voltage of connectors.

    Standard: 

    REAR DOOR LH ECU TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    CTY (R13-7) - GND (R13-6) L - W-B Rear LH side door courtesy switch signal Rear LH side door courtesy switch ON (door open) Rear LH side door courtesy switch OFF (door closed) Below 1 V 10 to 14 V
    SET (R12-4) - MSWE (R12-30) GR - BR-W Memory SET switch signal Memory SET switch OFF Memory SET switch ON 10 to 14 V Below 1 V
    M (R12-7) - MSWE (R12-30) B-R - W-B Memory M switch signal Memory M switch OFF Memory M switch ON 10 to 14 V Below 1 V
    CAN (R12-8) - MSWE (R12-30) P-B - W-B Memory C switch signal Memory C switch OFF Memory C switch ON 10 to 14 V Below 1 V
    IND (R12-9) - MSWE (R12-30) P-L - W-B Cancel indicator output signal Rear seat memory cancel switch OFF Rear seat memory cancel switch ON 10 to 14 V Below 1 V

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

  6. CHECK REAR DOOR RH ECU 
    Fig 8: Identifying Terminals Of Rear Door RH ECU
    G03001023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the R14 ECU connector.
    2. Measure the voltage of the wire harness side connector.

      Standard: 

      REAR DOOR RH ECU TERMINALS REFERENCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      CPUB (R14-1) - GND (R14-6) V-Y - W-B Power supply Always 10 to 14 V
      BDR (R14-2) - GND (R14-6) R-W - W-B Power supply Always 10 to 14 V
      GND (R14-6) - Body ground W-B - Body ground Ground Always Below 1 V
      SIG (R14-26) - GND (R14-6) R-L - W-B Power supply Ignition switch OFF --> ON 0V --> 10 to 14 V

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

    3. Reconnect the R14 ECU connector.
    4. Measure the voltage of the connectors.

    Standard: 

    REAR DOOR RH ECU TERMINALS REFERENCE

    Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
    CTY (R14-7) - GND (R14-6) L - W-B Rear RH side door courtesy switch signal Rear RH side door courtesy switch ON (door open) Rear RH side door courtesy switch OFF (door closed) Below 1 V 10 to 14 V
    SET (R15-4) - MSWE (R15-30) GR - BR-W Memory SET switch signal Memory SET switch OFF Memory SET switch ON 10 to 14 V Below 1 V
    M (R15-7) - MSWE (R15-30) B-R - W-B Memory M switch signal Memory M switch OFF Memory M switch ON 10 to 14 V Below 1 V
    CAN (R15-8) - MSWE (R15-30) P-B - W-B Memory C switch signal Memory C switch OFF Memory C switch ON 10 to 14 V Below 1 V
    IND (R15-9) - MSWE (R15-30) P-L - W-B Cancel indicator output signal Rear seat memory cancel switch OFF Rear seat memory cancel switch ON 10 to 14 V Below 1 V

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

About FixVault