MULTIPLEX COMMUNICATION SYSTEM > TERMINALS OF ECU

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CHECK MULTIPLEX NETWORK GATEWAY ECU


  1. Disconnect the G1 ECU connector.


    E108405E07

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    BATT (G1-10) - GND (G1 24)
    		SB - W-B
    		+B (BATT) power supply
    		Always
    		10 to 14 V
    IG (G1-1) - Body ground
    		Y - Body ground
    		Ignition power supply
    		Ignition switch ON
    		10 to 14 V
    ACC (G1-2) - Body ground
    		L - Body ground
    		ACC power supply
    		Ignition switch ON
    		10 to 14 V
    SIL (G1-7) - Body ground
    		GR - Body ground
    		Bus ''+'' line
    		During transmission
    		Pulse generation
    MPI1 (G1-4) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPI2 (G1-13) - Body ground
    		O - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPD1 (G1-3) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPD2 (G1-12) - Body ground
    		R - Body ground
    		W-B - Body ground
    		Always
    		10 kΩ or higher
    GND (G1-24) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    GTX- (G1-21) - Body ground
    		B - Body ground
    		AVC-LAN line
    		Always
    		10 kΩ or higher
    GTX+ (G1-6) - Body ground
    		R - Body ground
    		AVC-LAN line
    		Always
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK INSTRUMENT PANEL JUNCTION BLOCK (MULTIPLEX NETWORK BODY ECU)

  1. Disconnect the 1E, 1D and 1F junction block connectors.



  2. Disconnect the B7 ECU connector.


    B111044E02

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    BECU (1D-10) - Body ground
    		SB - Body ground
    		+B (BECU) power supply
    		Always
    		10 to 14 V
    MPX1 (1E-7) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (B7-21) - Body ground
    		O - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND1 (1F-10) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK CENTER CLUSTER INTEGRATION PANEL (W/O LEXUS NAVIGATION SYSTEM)


  1. Disconnect the C4 panel connector.


    B069613E02

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG+ (C4-9) - Body ground
    		LG - Body ground
    		Ignition switch (on) signal
    		Ignition switch ON
    		10 to 14 V
    MPX+ (C4-5) - Body ground
    		L - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX- (C4-12) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (C4-7) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK AUTO WIPER ECU


  1. Disconnect the A31 and A30 ECU connectors.


    B111029E02

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    WIG (A30-10) - Body ground
    		Y - Body ground
    		Ignition switch (on) signal
    		Ignition switch ON
    		10 to 14 V
    MPX1 (A31-1) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E (A31-12) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK AFS ECU (W/ ADAPTIVE FRONT-LIGHT SYSTEM)


  1. Disconnect the A17 ECU connector.


    E068883E03

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (A17-2) - Body ground
    		P - Body ground
    		Ignition switch (on) signal
    		Ignition switch ON
    		10 to 14 V
    IGS (A17-12) - Body ground
    		P - Body ground
    		Ignition switch (on) signal
    		Ignition switch ON
    		10 to 14 V
    MPX1 (A17-5) - Body ground
    		P - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E1 (A17-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (W/ DRIVING POSITION MEMORY)


  1. Disconnect the P30 and P31 ECU connectors.


    B107920E09

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B (P31-5) - Body ground
    		LG - Body ground
    		+B (+B) power supply
    		Always
    		10 to 14 V
    MPX1 (P30-1) - Body ground
    		W - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (P31-1) - Body ground
    		W-B - Body ground
    		Ground
    		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 (A/C ECU)


  1. Disconnect the A11 amplifier connector.


    I036314E06

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG+ (A11-1) - Body ground
    		Y - Body ground
    		Ignition switch (on) signal
    		Ignition switch ON
    		10 to 14 V
    MPX+ (A11-3) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX- (A11-4) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (A11-6) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK CENTER AIRBAG SENSOR ASSEMBLY


  1. Disconnect the A24 sensor connector.


    B069831E03

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG2 (A24-5) - Body grond
    		B - Body grond
    		Ignition switch (on) signal
    		Ignition switch ON
    		10 to 14 V
    MPX1 (A24-24) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (A24-22) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E2 (A24-28) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK COMBINATION METER ASSEMBLY (METER ECU)


  1. Disconnect the C8 and C9 meter connectors.


    I036750E01

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (C8-15) - Body ground
    		SB - Body ground
    		+B (B) power supply
    		Always
    		10 to 14 V
    B (C8-16) - Body ground
    		O - Body ground
    		+B (B) power supply
    		Always
    		10 to 14 V
    MPX+ (C9-4) - Body ground
    		V - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX- (C8-5) - Body ground
    		Y - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E (C9-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK SLIDING ROOF DRIVE GEAR (SLIDING ROOF CONTROL ECU)


  1. Disconnect the M5 driver gear connector.


    E109409E06

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (M5-1) - Body ground
    		P - Body ground
    		+B (B) power supply
    		Always
    		10 to 14 V
    MPX1 (M5-10) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E (M5-7) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK MULTIPLEX TILT AND TELESCOPIC ECU (W/ DRIVING POSITION MEMORY)


  1. Disconnect the T4 ECU connector.


    B069615E02

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B (T4-2) - Body ground
    		Y - Body ground
    		+B (+B) power supply
    		Always
    		10 to 14 V
    MPX1 (T4-5) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (T4-14) - Body ground
    		O - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (T4-11) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK RAIN SENSOR (W/ AUTOMATIC WIPER SYSTEM)


  1. Disconnect the R7 sensor connector.


    B069834E01

  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
    		P - Body ground (*1)
    B - Body ground (*2)
    		Ignition switch (on) signal
    		Ignition switch ON
    		10 to 14 V
    MPX (R7-2) - Body ground
    		V - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    ES (R7-3) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω

    1. *1: w/ Sliding roof system
    2. *2: w/o Sliding roof system
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK MULTIPLEX NETWORK MASTER SWITCH


  1. Disconnect the P19 switch connector.


    B056558E07

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (P19-9) - Body ground
    		L-B - Body ground
    		+B (CPUB) power supply
    		Always
    		10 to 14 V
    GND (P19-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    MPX1 (P19-7) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (P19-8) - 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 MULTIPLEX BACK DOOR ECU


  1. Disconnect the P10 and P11 ECU connectors.


    B068464E05

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (P11-2) - Body ground
    		Y - Body ground
    		+B (B) power supply
    		Always
    		10 to 14 V
    MPX1 (P10-22) - Body ground
    		SB - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (P11-8) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK TRANSPONDER KEY ECU


  1. Disconnect the T8 ECU connector.


    B069614E02

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (T8-1) - Body ground
    		V - Body ground
    		B (CPUB) power supply
    		Always
    		10 to 14 V
    MPX1 (T8-4) - Body ground
    		O - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (T8-5) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (T8-14) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK OUTER MIRROR CONTROL ECU LH (W/ DRIVING POSITION MEMORY)


  1. Disconnect the R17 ECU connector.


    B069728E03

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (R17-7) - Body ground
    		L-B - Body ground
    		B (CPUB) power supply
    		Always
    		10 to 14 V
    MPX1 (R17-6) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (R17-1 ) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    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 R18 ECU connector.


    B069726E04

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (R18-7) - Body ground
    		L-B - Body ground
    		B (CPUB) power supply
    		Always
    		10 to 14 V
    MPX1 (R18-6) - Body ground
    		L - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (R18-1 ) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.


CHECK DOUBLE DOOR LOCK ECU


  1. Disconnect the D2 ECU connector.


    B064460E04

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

    Symbols (Terminals No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B (D2-1) - Body ground
    		R - Body ground
    		B (+B) power supply
    		Always
    		10 to 14 V
    MPX1 (D2-9) - Body ground
    		LG - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (D2-14) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.