2007 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Terminals Of Ecu

  1. MULTIPLEX NETWORK MASTER SWITCH (DRIVER) 
    Fig 1: Identifying Multiplex Network Master Switch (Driver) Connector Terminals
    G04050705Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the M7 switch connector.
    2. Measure the voltage and resistance of each terminal according to the value(s) in TERMINAL SPECIFICATION TABLE (RESISTANCE)  and TERMINAL SPECIFICATION TABLE (VOLTAGE)  .

      Resistance 

      TERMINAL SPECIFICATION TABLE (RESISTANCE)

      Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition
      GND (M7-2) - Body ground W-B - Body ground Ground Always Below 1 ohms

      Voltage 

      TERMINAL SPECIFICATION TABLE (VOLTAGE)

      Symbols (Terminal No.) Wiring Color Terminal Description Always Specified Condition
      BDR (M7-10) - GND (M7-2) L - W-B +B power supply Always 10 to 14 V
      CPUB (M7-9) - GND (M7-2) G - W-B +B power supply Always 10 to 14 V
      SIG (M7-20) - GND (M7-2) B - W-B Ignition power supply Engine switch OFF --> ON (IG) 0 V --> 10 to 14 V

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

    3. Reconnect the M7 switch connector and reset the power window motor.
    4. Measure the voltage according to the value(s) in TERMINAL SPECIFICATION TABLE  .

    Voltage 

    MULTIPLEX NETWORK MASTER SWITCH (DRIVER) (VOLTAGE)

    Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
    UP (M7-1) - GND (M7-2) R - W-B Power window motor UP output Engine switch on (IG), driver side power window switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
    UP (M7-1) - GND (M7-2) R - W-B Power window motor UP output Engine switch on (IG), 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 (M7-11) - GND (M7-2) G - W-B Power window motor DOWN output Engine switch on (IG), driver side power window switch OFF --> DOWN (Manual operation) 10 to 14 V --> 0 V
    DN (M7-11) - GND (M7-2) G - W-B Power window motor DOWN output Engine switch on (IG), driver side power window fully closed --> driver side power window switch DOWN (AUTO operation) --> driver side power window fully open 10 to 14 V --> 0 V
    PWS (M7-6) - GND (M7-2) P - W-B Power window lock switch output Engine switch on (IG), power window lock switch UNLOCK --> LOCK 10 to 14 V --> 0 V
    VCC (M7-19) - GND (M7-2) LG - W-B Power window motor power source Engine switch on (IG), driver side power window switch OFF --> UP or OFF --> DOWN 0 V --> 10 to 14 V

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

  2. CHECK MULTIPLEX NETWORK SWITCH (FRONT PASSENGER SIDE) 
    Fig 2: Identifying Multiplex Network Switch (Front Passenger Side) Connector Terminals
    G04050706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L13 switch connector.
    2. Measure the voltage and resistance according to the value(s) in TERMINAL SPECIFICATION TABLE (RESISTANCE)  and TERMINAL SPECIFICATION TABLE (VOLTAGE)  .

      Resistance 

      TERMINAL SPECIFICATION TABLE (RESISTANCE)

      Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
      GND (L13-7) - Body ground W-B - Body ground Ground Always Below 1 ohms

      Voltage 

      TERMINAL SPECIFICATION TABLE (VOLTAGE)

      Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
      BDR (L13-12) - GND (L13-7) L - W-B +B power supply 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 L13 switch connector and reset the power window motor.
    4. Measure the voltage according to the value(s) in TERMINAL SPECIFICATION TABLE  .

    Voltage 

    MULTIPLEX NETWORK SWITCH (FRONT PASSENGER SIDE) (VOLTAGE)

    Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
    UP (L13-6) - GND (L13-7) R - W-B Power window motor UP output Engine switch on (IG), front passenger side power window switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
    UP (L13-6) - GND (L13-7) R - W-B Power window motor UP output Engine switch on (IG), front passenger side power window fully open --> front passenger side power switch UP (AUTO operation) --> front passenger side power window fully closed 0 V --> 10 to 14 V --> 0 V
    DN (L13-1) - GND (L13-7) G - W-B Power window motor DOWN output Engine switch on (IG), front passenger side power window switch OFF --> DOWN (Manual operation) 10 to 14 V --> 0 V
    DN (L13-1) - GND (L13-7) G - W-B Power window motor DOWN output Engine switch on (IG), front passenger side power window fully closed --> front passenger side power window switch DOWN (AUTO operation) --> front passenger side power window fully open 10 to 14 V --> 0 V
    PCT (L13-11) - GND (L13-7) P - W-B Power window lock switch output Engine switch on (IG), power window lock switch UNLOCK --> LOCK 10 to 14 V --> 0 V
    VCC (L13-5) - SGND (L13-8) W - L Power window motor power source Engine switch on (IG), front passenger side power window switch OFF --> UP or OFF --> DOWN 0 V --> 10 to 14 V

    If the result is not as specified, the multiplex network switch may have a malfunction.

  3. CHECK MULTIPLEX NETWORK SWITCH (REAR LH) 
    Fig 3: Identifying Multiplex Network Switch (Rear LH) Connector Terminals
    G04050707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the O1 switch connector.
    2. Measure the voltage and resistance according to the value(s) in TERMINAL SPECIFICATION TABLE (RESISTANCE)  and TERMINAL SPECIFICATION TABLE (VOLAGE)  .

      Resistance 

      TERMINAL SPECIFICATION TABLE (RESISTANCE)

      Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
      GND (O1-7) - Body ground W-B - Body ground Ground Always Below 1 ohms
      SEL2 (O1-10) - GND (O1-7) W-B - W-B Terminal for identification of rear LH switch Always Below 1 ohms

      Voltage 

      TERMINAL SPECIFICATION TABLE (VOLAGE)

      Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
      BDR (O1-12) - GND (O1-7) O - W-B +B power supply 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 O1 switch connector and reset the power window motor.
    4. Measure the voltage according to the value(s) in TERMINAL SPECIFICATION TABLE  .

    Voltage 

    MULTIPLEX NETWORK SWITCH (REAR LH) (VOLTAGE)

    Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
    UP (O1-6) - GND (O1-7) R - W-B Power window motor UP output Engine switch on (IG), rear LH power window switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
    UP (O1-6) - GND (O1-7) R - W-B Power window motor UP output Engine switch on (IG), rear LH power window fully open --> rear LH power window switch UP (AUTO operation) --> rear LH power window fully closed 0 V --> 10 to 14 V --> 0 V
    DN (O1-1) - GND (O1-7) G - W-B Power window motor DOWN output Engine switch on (IG), rear LH power window switch OFF --> DOWN (Manual operation) 10 to 14 V --> 0 V
    DN (O1-1) - GND (O1-7) G - W-B Power window motor DOWN output Engine switch on (IG), rear LH power window fully closed --> rear LH power window switch DOWN (AUTO operation) --> rear LH power window fully open 10 to 14 V --> 0 V
    PCT1 (O1-11) - GND (O1-7) V - W-B Power window lock switch output Engine switch on (IG), Power window lock switch UNLOCK --> LOCK 10 to 14 V--> 0 V
    VCC (O1-5) - SGND (O1-8) W - LG Power window motor power source Engine switch on (IG), rear LH side power window switch OFF --> UP or OFF --> DOWN 0 V --> 10 to 14 V

    If the result is not as specified, the multiplex network switch may have a malfunction.

  4. CHECK MULTIPLEX NETWORK SWITCH (REAR RH) 
    Fig 4: Identifying Multiplex Network Switch (Rear RH) Connector Terminals
    G04050708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the N1 switch connector.
    2. Measure the voltage and resistance according to the value(s) in TERMINAL SPECIFICATION TABLE (RESISTANCE)  and TERMINAL SPECIFICATION TABLE (VOLTAGE)  .

      Resistance 

      TERMINAL SPECIFICATION TABLE (RESISTANCE)

      Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
      GND (N1-7) - Body ground W - B - Body ground Ground Always Below 1 ohms
      SEL1 (N1-9) - GND (N1-7) W-B - W-B Terminal for identification of rear RH switch Always Below 1 ohms

      Voltage 

      TERMINAL SPECIFICATION TABLE (VOLTAGE)

      Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
      BDR (N1-12) - GND (N1-7) O - W-B +B power supply 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 N1 switch connector and reset the power window motor.
    4. Measure the voltage according to the value(s) in TERMINAL SPECIFICATION TABLE  .

    Voltage 

    MULTIPLEX NETWORK SWITCH (REAR RH) (VOLTAGE)

    Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
    UP (N1-6) - GND (N1-7) R - W-B Power window motor UP output Engine switch on (IG), rear RH power window switch OFF --> UP (Manual operation) 0 V --> 10 to 14 V
    UP (N1-6) - GND (N1-7) R - W-B Power window motor UP output Engine switch on (IG), rear RH power window fully open --> rear RH power window switch UP (AUTO operation) --> rear RH power window fully closed 0 V --> 10 to 14 V --> 0 V
    DN (N1-1) - GND (N1-7) G - W-B Power window motor DOWN output Engine switch on (IG), rear RH power window switch OFF --> DOWN (Manual operation) 10 to 14 V --> 0 V
    DN (N1-1) - GND (N1-7) G - W-B Power window motor DOWN output Engine switch on (IG), rear RH power window fully closed --> rear RH power window switch DOWN (AUTO operation) --> rear RH power window fully open 10 to 14 V --> 0 V
    PCT1 (N1-11) - GND (N1-7) P - W-B Power window lock switch output Engine switch on (IG), Power window lock switch UNLOCK --> LOCK 10 to 14 V --> 0 V
    VCC (N1-5) - SGND (N1-8) W - LG Power window motor power source Engine switch on (IG), rear RH side power window switch OFF --> UP or OFF --> DOWN 0 V --> 10 to 14 V

    If the result is not as specified, the multiplex network switch may have a malfunction.

  5. CHECK MAIN BODY ECU RH (COWL SIDE J/B RH) 
    Fig 5: Checking Main Body ECU RH (Cowl Side J/B RH)
    G04050709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the RK connector.
    2. Measure the voltage according to the value(s) in MAIN BODY ECU RH (COWL SIDE J/B RH) (RK CONNECTOR DISCONNECTED)  and MAIN BODY ECU RH (COWL SIDE J/B RH) (RK CONNECTOR CONNECTED)  .

      Voltage 

      MAIN BODY ECU RH (COWL SIDE J/B RH) (RK CONNECTOR DISCONNECTED)

      Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
      BECU (RK-5) - Body ground G - R - Body ground Power Supply 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 RK connector.
    4. Measure the resistance according to the value(s) in MAIN BODY ECU RH (COWL SIDE J/B RH) (RK CONNECTOR CONNECTED)  .

    Resistance 

    MAIN BODY ECU RH (COWL SIDE J/B RH) (RK CONNECTOR CONNECTED)

    Symbols (Terminal No. Wiring Color Terminal Description Condition Specified Condition
    DCTY (P1-14) - Body ground W - Body ground Driver side courtesy switch input Driver side door CLOSED --> OPEN 10 k ohms or higher --> Below 1 ohms
    PCTY (J75-23) - Body ground B - W-B Front passenger side courtesy switch input Passenger side door CLOSED --> OPEN 10 k ohms or higher --> Below 1 ohms
    RCTY (P1-16) - Body ground O - W-B Rear RH side courtesy switch input Rear RH side door CLOSED --> OPEN 10 k ohms or higher --> Below 1 ohms
    LCTY (P1-16) - Body ground O - W-B Rear LH side courtesy switch input Rear LH side door CLOSED --> OPEN 10 k ohms or higher --> Below 1 ohms

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

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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