Lexus IS250 · Service Manual BODY

TERMINALS OF ECU

System information


MULTIPLEX NETWORK MASTER SWITCH (DRIVER)
B069754E10

  1. Disconnect the M7 (L17) switch connector.

  2. Measure the voltage and resistance of each terminal according to the value(s) in the table below.

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


    Voltage:
    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Always
    		 Specified Condition
    BDR (10) - GND (2)
    		 L - W-B
    		+B power supply
    		Always
    		 10 to 14 V
    CPUB (9) - GND (2)
    		 G - W-B
    		+B power supply
    		Always
    		 10 to 14 V
    SIG (20) - GND (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 (L17) switch connector and reset the power window motor.

  4. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    UP (1) - GND (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 (1) - GND (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 (11) - GND (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 (11) - GND (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 (6) - GND (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 (19) - GND (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.


CHECK MULTIPLEX NETWORK SWITCH (FRONT PASSENGER SIDE)
B069755E19

  1. Disconnect the M16 (L13) switch connector.

  2. Measure the voltage and resistance according to the value(s) in the table below.

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


    Voltage:
    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    BDR (12) - GND (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 M16 (L13) switch connector and reset the power window motor.

  4. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    UP (6) - GND (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 (6) - GND (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 (1) - GND (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 (1) - GND (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 (11) - GND (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 (5) - SGND (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.


CHECK MULTIPLEX NETWORK SWITCH (REAR LH)
B069755E17

  1. Disconnect the O1 switch connector.

  2. Measure the voltage and resistance according to the value(s) in the table below.

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


    Voltage:
    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 the table below.

    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.


CHECK MULTIPLEX NETWORK SWITCH (REAR RH)
B069755E15

  1. Disconnect the N1 switch connector.

  2. Measure the voltage and resistance according to the value(s) in the table below.

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


    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 the table below.

    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.


CHECK MAIN BODY ECU RH (COWL SIDE J/B RH)
B126297E01

  1. Disconnect the RK connector.

  2. Measure the voltage according to the value(s) in the table below.

    Voltage:
    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 the table below.

    Resistance:
    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 kΩ or higher → Below 1 Ω
    PCTY (J75-23) - Body ground
    		 B - W-B
    		 Front passenger side courtesy switch input
    		 Passenger side door CLOSED → OPEN
    		 10 kΩ or higher → Below 1 Ω
    RCTY (P1-16) - Body ground
    		 O - W-B
    		 Rear RH side courtesy switch input
    		 Rear RH side door CLOSED → OPEN
    		 10 kΩ or higher → Below 1 Ω
    LCTY (P1-16) - Body ground
    		 O - W-B
    		 Rear LH side courtesy switch input
    		 Rear LH side door CLOSED → OPEN
    		 10 kΩ or higher → Below 1 Ω

    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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