LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2004 >> RX 330 AWD >> Repair and Diagnosis >> Body & Frame >> Windows >> Power Window Control System - Diagnosis >> Terminals Of Ecu
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Terminals Of Ecu

  1. CHECK POWER WINDOW REGULATOR MASTER SWITCH (DRIVER DOOR ECU) 
    1. Disconnect the P22 switch connector.
      2. Fig 1: Identifying Power Window Regulator Master Switch ECU Terminals
      G03487238Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      POWER WINDOW REGULATOR MASTER SWITCH ECU TERMINALS VOLTAGE AND RESISTANCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (P22-2) - Body ground W-B - Body ground Ground Constant Below 1 Ω
      BDR (P22-10) - GND (P22-2) G - W-B +B (BDR) power supply Constant 10 to 14 V
      CPUB (P22-9) - GND (P22-2) L-B - W-B +B (CPUB) power supply Constant 10 to 14 V
      SIG (P22-20) - GND (P22-2) BR - W-B Ignition power supply Ignition switch OFF --> ON 0 V --> 10 to 14 V
      UP (P22-1) - DN (P22-11) GR - B
      • Power window motor UP output
      • Power window motor DOWN output
      		 Constant Below 1 Ω

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

    3. Reconnect the P22 switch connector and reset the power window motor (Refer to the pre-check, step 16) (See PRE-CHECK  ).
    4. Check the voltage of each terminal of the connector.

      Standard: 

      POWER WINDOW REGULATOR MASTER SWITCH ECU TERMINALS VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      UP (P22-1) - GND (P22-2) GR - W-B Power window motor UP output Ignition switch ON, Driver side power window switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
      UP (P22-1) - GND (P22-2) GR - W-B Power window motor UP output Ignition switch ON, Driver side power window fully open --> Driver side power window switch UP (AUTO operation) --> Driver side power window fully closed 0 V --> 10 to 14 V --> 0 V
      DN (P22-11) - GND (P22-2) B - W-B Power window motor DOWN output Ignition switch ON, Driver side power window switch OFF --> DOWN (Manual operation) 0 V --> 10 to 14 V
      DN (P22-11) - GND (P22-2) B - W-B Power window motor DOWN output Ignition switch ON, Driver side power window fully closed --> Driver side power window switch DOWN (AUTO operation) --> Driver side power window fully open 0 V --> 10 to 14 V --> 0 V
      PWS (P22-6) - GND (P22-2) O - W-B Power window lock switch output Ignition switch ON, Power window lock switch NORMAL --> LOCK 10 to 14 V --> 0 V
      VCC (P22-19) - SGND (P22-12) LG - R
      • Power window motor power source
      • Power window motor sensor ground
      		 Constant 10 to 14 V

      If the result is not as specified, the master switch (door ECU) may have a malfunction.

  2. CHECK POWER WINDOW REGULATOR SWITCH (PASSENGER DOOR ECU) 
    Fig 2: Identifying Power Window Regulator Switch ECU Terminals (Passenger Door ECU)
    G03487239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P19 switch connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      POWER WINDOW REGULATOR SWITCH ECU TERMINALS VOLTAGE AND RESISTANCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (P19-7) - Body ground W-B - Body ground Ground Constant Below 1 Ω
      BDR (P19-12) - GND (P19-7) G - W-B +B (BDR) power supply Constant 10 to 14 V
      UP (P19-6) - DN (P19-1) GR - B
      • Power window motor UP output
      • Power window motor DOWN output
      		 Constant Below 1 Ω

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

    3. Reconnect the P19 switch connector and reset the power window motor (Refer to the pre-check, step 16) (See PRE-CHECK  ).
    4. Check the voltage of each terminal of the connector.

      Standard: 

      POWER WINDOW REGULATOR SWITCH ECU TERMINALS VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      UP (P19-6) - GND (P19-7) GR - W-B Power window motor UP output Ignition switch ON, Regulator switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
      UP (P19-6) - GND (P19-7) GR - W-B Power window motor UP output Ignition switch ON, Passenger side power window fully open --> Regulator switch UP (AUTO operation) --> Passenger side power window fully closed 0 V --> 10 to 14 V --> 0 V
      DN (P19-1) - GND (P19-7) B - W-B Power window motor DOWN output Ignition switch ON, Regulator switch OFF --> DOWN (Manual operation) 0 V --> 10 to 14 V
      DN (P19-1) - GND (P19-7) B - W-B Power window motor DOWN output Ignition switch ON, Passenger side power window fully closed --> Regulator switch DOWN (AUTO operation) --> Passenger side power window fully open 0 V --> 10 to 14 V --> 0 V
      PCT (P19-11) - GND (P19-7) O - W-B Power window lock switch output Ignition switch ON, Power window lock switch of master switch NORMAL --> LOCK 10 to 14 V --> 0 V
      VCC (P19-5) - SGND (P19-8) LG - R
      • Power window motor power source
      • Power window motor sensor ground
      		 Constant 10 to 14 V

      If the result is not as specified, the regulator switch (door ECU) may have a malfunction.

  3. CHECK POWER WINDOW REGULATOR SWITCH (REAR LH DOOR ECU) 
    Fig 3: Identifying Power Window Regulator Switch ECU Terminals (Rear LH Door ECU)
    G03487240Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P20 switch connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      POWER WINDOW REGULATOR SWITCH ECU TERMINALS VOLTAGE AND RESISTANCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (P20-7) - Body ground W-B -Body ground Ground Constant Below 1 Ω
      BDR (P20-12) - GND (P20-7) LG - W-B +B (BDR) power supply Constant 10 to 14 V
      UP (P20-6) - DN (P20-1) V - W
      • Power window motor UP output
      • Power window motor DOWN output
      		 Constant Below 1 Ω
      (1)SEL2 (P20-10) - GND (P20-7) W-B - W-B Terminal for identification of rear LH switch Constant Below 1 Ω
      (1) Terminal SEL2 is used to distinguish between the front passenger side regulator switch, rear LH regulator switch and rear RH regulator switch. To distinguish between them, terminals SEL1 and SEL2 for the front passenger side regulator switch are not grounded; the positions of terminals SEL1 and SEL2 are different between the rear regulator switches LH and RH.

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

    3. Reconnect the P20 switch connector and reset the power window motor (Refer to the pre-check, step 16) (See PRE-CHECK  ).
    4. Check the voltage of each terminal of the connector.

      Standard: 

      POWER WINDOW REGULATOR SWITCH ECU TERMINALS VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      UP (P20-6) - GND (P20-7) V - W-B Power window motor UP output Ignition switch ON, Regulator switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
      UP (P20-6) - GND (P20-7) V - W-B Power window motor UP output Ignition switch ON, Rear LH power window fully open --> Regulator switch UP (AUTO operation) --> Rear LH power window fully closed 0 V --> 10 to 14 V --> 0 V
      DN (P20-1) - GND (P20-7) W - W-B Power window motor DOWN output Ignition switch ON, Regulator switch OFF --> DOWN (Manual operation) 0 V --> 10 to 14 V
      DN (P20-1) - GND (P20-7) W - W-B Power window motor DOWN output Ignition switch ON, Rear LH power window fully closed --> Regulator switch DOWN (AUTO operation) --> Rear LH power window fully open 0 V --> 10 to 14 V --> 0 V
      PCT1 (P20-11) - GND (P20-7) GR - W-B Power window lock switch output Ignition switch ON, Power window lock switch of master switch NORMAL --> LOCK 10 to 14 V --> 0 V
      VCC (P20-5) - SGND (P20-8) L - BR
      • Power window motor power source
      • Power window motor sensor ground
      		 Constant 10 to 14 V

      If the result is not as specified, the regulator switch (door ECU) may have a malfunction.

  4. CHECK POWER WINDOW REGULATOR SWITCH (REAR RH DOOR ECU) 
    Fig 4: Identifying Power Window Regulator Switch ECU Terminals (Rear RH Door ECU)
    G03487241Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the P21 switch connector.
    2. Check the voltage and resistance of each terminal of the wire harness side connector.

      Standard: 

      POWER WINDOW REGULATOR SWITCH ECU TERMINALS VOLTAGE AND RESISTANCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (P21-7) - Body ground W-B -Body ground Ground Constant Below 1 Ω
      BDR (P21-12) - GND (P21-7) LG - W-B +B (BDR) power supply Constant 10 to 14 V
      UP (P21-6) - DN (P21-1) V - W
      • Power window motor UP output
      • Power window motor DOWN output
      		 Constant Below 1 Ω
      (1)SEL1 (P21-9) - GND (P21-7) W-B - W-B Terminal for identification of rear RH switch Constant Below 1 Ω
      (1) Terminal SEL1 is used to distinguish between the front passenger side regulator switch, rear LH regulator switch and rear RH regulator switch. To distinguish between them, terminals SEL1 and SEL2 for the front passenger side regulator switch are not grounded; the positions of terminals SEL1 and SEL2 are different between the rear regulator switches LH and RH.

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

    3. Reconnect the P21 switch connector and reset the power window motor (Refer to the pre-check, step 16) (See PRE-CHECK  ).
    4. Check the voltage of each terminal of the connector.

      Standard: 

      POWER WINDOW REGULATOR SWITCH ECU TERMINALS VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      UP (P21-6) - GND (P21-7) V - W-B Power window motor UP output Ignition switch ON, Regulator switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
      UP (P21-6) - GND (P21-7) V - W-B Power window motor UP output Ignition switch ON, Rear RH power window fully open --> Regulator switch UP (AUTO operation) --> Rear RH power window fully closed 0 V --> 10 to 14 V --> 0 V
      DN (P21-1) - GND (P21-7) W - W-B Power window motor DOWN output Ignition switch ON, Regulator switch OFF --> DOWN (Manual operation) 0 V --> 10 to 14 V
      DN (P21-1) - GND (P21-7) W - W-B Power window motor DOWN output Ignition switch ON, Rear RH power window fully closed --> Regulator switch DOWN (AUTO operation) --> Rear RH power window fully open 0 V --> 10 to 14 V --> 0 V
      PCT1 (P21-11) - GND (P21-7) GR - W-B Power window lock switch output Ignition switch ON, Power window lock switch of master switch NORMAL --> LOCK 10 to 14 V --> 0 V
      VCC (P21-5) - SGND (P21-8) L - BR
      • Power window motor power source
      • Power window motor sensor ground
      		 Constant 10 to 14 V

      If the result is not as specified, the regulator switch (door ECU) may have a malfunction.

  5. CHECK INSTRUMENT PANEL J/B ASSY (MULTIPLEX NETWORK BODY ECU) 
    Fig 5: Identifying Instrument Panel J/B Assy Connectors (Multiplex Network Body ECU)
    G03487242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the B4, B5 and B6 ECU connectors.
    2. Disconnect the 1 A, 1D, 1F and 1M J/B connectors.
    3. Check the voltage and resistance between each terminal of the wire harness side connectors and body ground.

      Standard: 

      INSTRUMENT PANEL J/B ASSY AND ECU TERMINALS VOLTAGE AND RESISTANCE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      BECU (1D-10) - Body ground L-B - Body ground +B (BECU) power supply Constant 10 to 14 V
      ALTB (1D-16) - Body ground W - Body ground +B (power system, generator system) power supply Constant 10 to 14 V
      BATB (1A-1) - Body ground W(1) - Body ground +B (power system, generator system) power supply Constant 10 to 14 V
      B(2) - Body ground
      KSW (B4-21) - Body ground B - Body ground Key unlock warning switch input No key in ignition key cylinder --> Key inserted 10 kΩ or higher --> Below 1 Ω
      DCTY (B6-14) - Body ground L - Body ground Driver side courtesy switch input Driver side door CLOSED --> OPEN 10 kΩ or higher --> Below 1 Ω
      PCTY (B5-23) - Body ground L - Body ground Passenger side courtesy switch input Passenger side door CLOSED --> OPEN 10 kΩ or higher --> Below 1 Ω
      GND1 (1F-10) - Body ground W-B - Body ground Ground Constant Below 1 Ω
      GND2 (1M-9) - Body ground W-B -Body ground Ground Constant Below 1 Ω
      (1) w/ Air suspension system
      (2) w/o Air suspension system

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

    4. Reconnect the B4, B5 and B6 ECU connectors.
    5. Reconnect the 1 A, 1D, 1F and 1M J/B connectors.
    6. Check the voltage between each terminal of the connector and the body ground.

      Standard: 

      INSTRUMENT PANEL J/B ASSY AND ECU TERMINALS VOLTAGE

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      KSW (B4-21) - Body ground B - Body ground Key unlock warning switch input No key in ignition key cylinder --> Key inserted 10 to 14 V --> 0 V

      If the result is not as specified, the J/B assy (body ECU) may have a malfunction.

scientia non olet · About LEMON Manuals