Multiplex Communication System Terminals Of Ecu

Communication System. Lexus Is250, Is220D. Gse20 Ale20
Multiplex Communication. Lexus Is250, Is220D. Gse20 Ale20

  1. CHECK GATEWAY ECU

  1. CHECK MAIN BODY ECU LH (COWL SIDE J/B LH)

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

  1. CHECK TILT AND TELESCOPIC ECU

  1. CHECK POWER WINDOW MASTER SWITCH

  1. CHECK OUTER MIRROR CONTROL ECU LH

  1. CHECK POWER SEAT CONTROL ECU RH

  1. CHECK CERTIFICATION ECU

  1. CHECK FRONT CONTROLLER

  1. CHECK OUTER MIRROR CONTROL ECU RH

  1. CHECK POWER SEAT CONTROL ECU LH

  1. CHECK SLIDING ROOF CONTROL ECU

  1. CHECK RAIN SENSOR

  1. CHECK POWER SOURCE CONTROL ECU

  1. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY

  1. CHECK COMBINATION METER ECU

  1. CHECK CLEARANCE WARNING ECU

  1. CHECK AFS ECU

  1. CHECK AIR CONDITIONING AMPLIFIER

  1. CHECK DOUBLE DOOR LOCK ECU

Multiplex Communication System -- Terminals Of Ecu



CHECK GATEWAY ECU


  1. Disconnect the gateway ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (J76-1) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (J76-1) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    ACC (J76-2) - Body ground
    		O - Body ground
    		Power source (ACC)
    		Engine switch: off
    		Below 1 V
    ACC (J76-2) - Body ground
    		O - Body ground
    		Power source (ACC)
    		Engine switch: on (IG)
    		10 to 14 V
    BATT (J76-10) - Body ground
    		LG - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    MPI1 (J76-4) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPI2 (J76-13) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPD1 (J76-3) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPD2 (J76-12) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (J76-24) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK MAIN BODY ECU LH (COWL SIDE J/B LH)


  1. Disconnect the main body ECU LH (cowl side J/B LH) connectors.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connectors.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (LK-6) - Body ground
    		Y - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (LK-6) - Body ground
    		Y - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    BKUP (LJ-23) - Body ground
    		Y - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    MPXB (LD-18) - Body ground
    		LG - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (LD-3) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    SGND (LD-8) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    SGND (LD-9) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (Q3-15) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (A30-17) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

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


  1. Disconnect the main body ECU RH (cowl side J/B RH) connectors.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connectors.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (RM-1) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (RM-1) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    *1ACC (RD-27) - Body ground
    *2ACC (RJ-22) - Body ground
    		O - Body ground
    		Power source (ACC)
    		Engine switch: off
    		Below 1 V
    *1ACC (RD-27) - Body ground
    *2ACC (RJ-22) - Body ground
    		O - Body ground
    		Power source (ACC)
    		Engine switch: on (ACC)
    		10 to 14 V
    ALTB (RA-15) - Body ground
    		SB - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    BECU (RK-5) - Body ground
    		G-R - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    BATB (RN-1) - Body ground
    		R - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND2 (RD-11) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    GND2 (RD-7) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    GND2 (RA-4) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    GND2 (RA-5) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    GND1 (RD-17) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX5 (P1-5) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX6 (J75-20) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX4 (J75-19) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX1 (RA-20) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX1 (RJ-21) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (J75-21) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    HINT:
    1. *1: LHD
    2. *2: RHD
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK TILT AND TELESCOPIC ECU


  1. Disconnect the tilt and telescopic ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (J28-8) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (J28-8) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    ECUB (J28-9) - Body ground
    		LG - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    +B (J28-2) - Body ground
    		SB - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (J28-11) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (J28-5) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK POWER WINDOW MASTER SWITCH


  1. Disconnect the power window master switch connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and the resistance of the wire harness side connector.

    for LHD
    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SIG (M7-20) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    SIG (M7-20) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    CPUB (M7-9) - Body ground
    		G - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    BDR (M7-10) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (M7-2) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (M7-7) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (M7-8) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher

    for RHD
    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SIG (L17-20) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    SIG (L17-20) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    CPUB (L17-9) - Body ground
    		G - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    BDR (L17-10) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (L17-2) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (L17-7) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (L17-8) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK OUTER MIRROR CONTROL ECU LH


  1. Disconnect the outer mirror control ECU LH connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SIG (M10-3) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    SIG (M10-3) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    CPUB (M10-4) - Body ground
    		G - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    BDR (M10-6) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (M10-1) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (M10-8) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK POWER SEAT CONTROL ECU RH


  1. Disconnect the power seat control ECU RH connectors.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connectors.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (T7-4) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (T7-4) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    +B (T6-5) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    SYSB (T7-8) - Body ground
    		P - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (T6-1) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (T7-1) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK CERTIFICATION ECU


  1. Disconnect the certification ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (P33-18) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (P33-18) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    ACC (P33-19) - Body ground
    		O - Body ground
    		Power source (ACC)
    		Engine switch: off
    		Below 1 V
    ACC (P33-19) - Body ground
    		O - Body ground
    		Power source (ACC)
    		Engine switch: on (IG)
    		10 to 14 V
    +B1 (P33-1) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    E (P33-17) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (P33-27) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (P33-28) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK FRONT CONTROLLER


  1. Disconnect the front controller connectors.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    2E-3 - Body ground
    		B-Y - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    2E-3 - Body ground
    		B-Y - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    2E-4 - Body ground
    		G-R - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    2F-1 - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    2F-6 - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    2F-5 - Body ground
    		L - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK OUTER MIRROR CONTROL ECU RH


  1. Disconnect the outer mirror control ECU RH connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SIG (L10-3) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    SIG (L10-3) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    CPUB (L10-4) - Body ground
    		G - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    BDR (L10-6) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (L10-1) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (L10-8) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK POWER SEAT CONTROL ECU LH


  1. Disconnect the power seat control ECU LH connectors.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (U7-4) - Body ground
    		Y - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (U7-4) - Body ground
    		Y - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    +B (U6-5) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    SYSB (U7-8) - Body ground
    		LG - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (U6-1) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (U7-1) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK SLIDING ROOF CONTROL ECU


  1. Disconnect the sliding roof control ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (R6-6) - Body ground
    		V - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (R6-6) - Body ground
    		V - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    B (R6-5) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    E (R6-7) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (R6-10) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK RAIN SENSOR


  1. Disconnect the rain sensor connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    SIG (R7-1) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    SIG (R7-1) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    MPX (R7-2) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK POWER SOURCE CONTROL ECU


  1. Disconnect the power source control ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    AM1 (J55-33) - Body ground
    		O - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    AM2 (J55-12) - Body ground
    		O - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    MPX1 (J55-7) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (J55-24) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND2 (J55-6) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK WINDSHIELD WIPER SWITCH ASSEMBLY


  1. Disconnect the windshield wiper switch assembly connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the resistance and voltage of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (J26-2) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (J26-2) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    B (J26-1) - Body ground
    		LG - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    E (J26-5) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (J26-6) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK COMBINATION METER ECU


  1. Disconnect the combination meter ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG+ (J34-12) - Body ground
    		O - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG+ (J34-12) - Body ground
    		O - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    B (J34-23) - Body ground
    		L - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    B (J34-24) - Body ground
    		LG - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    E2 (J34-1) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    ES (J34-13) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX+ (J34-6) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX- (J34-18) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK CLEARANCE WARNING ECU


  1. Disconnect the clearance warning ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (Q37-8) - Body ground
    		Y - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (Q37-8) - Body ground
    		Y - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    E (Q37-27) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    M+ (Q37-26) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK AFS ECU


  1. Disconnect the AFS ECU connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (A27-2) - Body ground
    		B-O - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG (A27-2) - Body ground
    		B-O - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    MPX1 (A27-5) - Body ground
    		BR-R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (A27-6) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E1 (A27-1) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK AIR CONDITIONING AMPLIFIER


  1. Disconnect the air conditioning amplifier connector.


    Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  2. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG+ (J58-21) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: off
    		Below 1 V
    IG+ (J58-21) - Body ground
    		B - Body ground
    		Power source (IG)
    		Engine switch: on (IG)
    		10 to 14 V
    B (J58-1) - Body ground
    		Y - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    MPX+ (J58-30) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX- (J58-31) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (J58-20) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω

CHECK DOUBLE DOOR LOCK ECU

Lexus Is250, Is220D. Gse20 Ale20.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Measure the voltage and the resistance of the wire harness side connector.

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B (P34-1) - Body ground
    		R - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    CPUB (P34-7) - Body ground
    		LG - Body ground
    		Power source (+B)
    		Always
    		10 to 14 V
    GND (P34-14) - Body ground
    		W-B - Body ground
    		Ground for main power supply
    		Always
    		Below 1 Ω
    MPX1 (P34-9) - Body ground
    		*1LG - Body ground
    *2GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    HINT:
    1. *1: LHD
    2. *2: RHD
    If the result is not as specified, there may be a malfunction on the wire harness side.