Multiplex Communication System Terminals Of Ecu

Communication System. Lexus Gs430, Gs300. Uzs190 Grs190
Multiplex Communication. Lexus Gs430, Gs300. Uzs190 Grs190

  1. CHECK NETWORK GATEWAY ECU

  1. CHECK ENGINE ROOM NO. 2 RELAY BLOCK (FRONT CONTROLLER)

  1. CHECK COWL SIDE JUNCTION BLOCK LH (COWL SIDE JUNCTION BLOCK ECU LH)

  1. CHECK COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)

  1. CHECK NO. 1 JUNCTION BLOCK ASSEMBLY (MULTIPLEX NETWORK REAR ECU)

  1. CHECK MULTIPLEX NETWORK DOOR ECU FRONT LH (FRONT DOOR ECU LH)

  1. CHECK MULTIPLEX NETWORK DOOR ECU FRONT RH (FRONT DOOR ECU RH)

  1. CHECK MULTIPLEX NETWORK DOOR ECU REAR LH (REAR DOOR LH)

  1. CHECK MULTIPLEX NETWORK DOOR ECU REAR RH (REAR DOOR RH)

  1. CHECK POSITION CONTROL ECU AND SWITCH ASSEMBLY (DRIVER SIDE)

  1. CHECK NO. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU)

  1. CHECK AIRBAG SENSOR ASSEMBLY CENTER

  1. CHECK COMBINATION METER ASSEMBLY (METER ECU)

  1. CHECK SLIDING ROOF DRIVE GEAR SUB-ASSEMBLY (SLIDING ROOF CONTROL ECU)

  1. CHECK MULTIPLEX TILT AND TELESCOPIC ECU

  1. CHECK COMBINATION SWITCH ASSEMBLY (WINDSHIELD WIPER SWITCH)

  1. CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

  1. CHECK POWER SOURCE CONTROL ECU

  1. CHECK CERTIFICATION ECU

  1. CHECK TIRE PRESSURE WARNING ECU

Multiplex Communication System -- Terminals Of Ecu



CHECK NETWORK GATEWAY ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L66 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    BATT (L66-10) - GND (L66-24)
    		G - W-B
    		+B (BATT) power supply
    		Always
    		10 to 14 V
    IG (L66-1) - Body ground
    		B - Body ground
    		Ignition power supply
    		Engine switch on (IG)
    		10 to 14 V
    ACC (L66-2) - Body ground
    		V - Body ground
    		ACC power supply
    		Engine switch on (ACC)
    		10 to 14 V
    SIL (L66-7) - Body ground
    		O - Body ground
    		Bus ''+'' line
    		During transmission
    		Pulse generation
    MPI1 (L66-4) - Body ground
    		LG - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPI2 (L66-13) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPL1 (L66-5) - Body ground
    		W - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPL2 (L66-14) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPD1 (L66-3) - Body ground
    		P - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPD2 (L66-12) - Body ground
    		SB - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (L66-24) - 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 ENGINE ROOM NO. 2 RELAY BLOCK (FRONT CONTROLLER)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the 2E and 2F junction block connectors.

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

    Symbol (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    FMB3 (2E-4) - E (2F-1)
    		G-R - W-B
    		+B (FMB3) power supply
    		Always
    		10 to 14 V
    MPX1 (2F-5) - E (2F-1)
    		GR-L*1, GR*2 - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (2F-6) - E (2F-1)
    		GR-L - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    E (2F-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    HINT:
    *1: LHD
    *2: RHD
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK COWL SIDE JUNCTION BLOCK LH (COWL SIDE JUNCTION BLOCK ECU LH)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the PA, PD and PL junction block connectors.

  2. Disconnect the A32 and W3 ECU connectors.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    MPX-B (PL-1) - GND (PA-14)
    		G-R - W-B
    		+B (MPX-B) power supply
    		Always
    		10 to 14 V
    MPX1 (W3-15) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX4 (A32-6) - Body ground
    		G-R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (PA-14) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    SGND (PD-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 COWL SIDE JUNCTION BLOCK RH (MULTIPLEX NETWORK BODY ECU)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the DA, DD and DK junction block connectors.

  2. Disconnect the L68 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    BECU (DK-5) - GND2 (DD-7)
    		G-R - W-B
    		+B (MPX-B) power supply
    		Always
    		10 to 14 V
    MPX1 (DA-26) - GND2 (DD-7)
    		GR - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (L68-21) - GND2 (DD-7)
    		G*1, O*2 - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    GSW (DA-7) - GND2 (DD-7)
    		B - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    GND2 (DD-7) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    HINT:
    *1: LHD
    *2: RHD
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK NO. 1 JUNCTION BLOCK ASSEMBLY (MULTIPLEX NETWORK REAR ECU)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the LB, LC and LF junction block connectors.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    RFRL (LB-1) - Body ground
    		B - Body ground
    		+B (MPX-B) power supply
    		Always
    		10 to 14 V
    MPX1 (LC-21) - Body ground
    		BR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (LC-31) - Body ground)
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    P-GND (LF-1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    SG (LC-3) - 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 NETWORK DOOR ECU FRONT LH (FRONT DOOR ECU LH)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the O3 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (O3-4) - Body ground
    		LG - Body ground
    		+B (CPUB) power supply
    		Always
    		10 to 14 V
    BDR (O3-6) - Body ground
    		L - Body ground
    		+B (BDR) power supply
    		Always
    		10 to 14 V
    MPX1 (O3-8) - Body ground
    		P - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (O3-9) - Body ground
    		L - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (O3-1) - 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 MULTIPLEX NETWORK DOOR ECU FRONT RH (FRONT DOOR ECU RH)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the N4 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (N4-4) - Body ground
    		LG - Body ground
    		+B (CPUB) power supply
    		Always
    		10 to 14 V
    BDR (N4-6) - Body ground
    		L - Body ground
    		+B (BDR) power supply
    		Always
    		10 to 14 V
    MPX1 (N4-8) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (N4-9) - Body ground
    		P - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (N4-1) - 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 MULTIPLEX NETWORK DOOR ECU REAR LH (REAR DOOR LH)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the Q2 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (Q2-4) - Body ground
    		BR - Body ground
    		+B (CPUB) power supply
    		Always
    		10 to 14 V
    BDR (Q2-6) - Body ground
    		L - Body ground
    		+B (BDR) power supply
    		Always
    		10 to 14 V
    MPX1 (Q2-8) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (Q2-9) - Body ground
    		P - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (Q2-1) - 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 MULTIPLEX NETWORK DOOR ECU REAR RH (REAR DOOR RH)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the P3 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (P3-4) - Body ground
    		G - Body ground
    		+B (CPUB) power supply
    		Always
    		10 to 14 V
    BDR (P3-6) - Body ground
    		L - Body ground
    		+B (BDR) power supply
    		Always
    		10 to 14 V
    MPX1 (P3-8) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (P3-9) - Body ground
    		P - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (P3-1) - 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 (DRIVER SIDE)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the d7*1, c7*2 and d8*1, c6*2 ECU connectors.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B (d7-5)*1 - GND (d7-1)*1
    		L - W-B
    		+B (+B) power supply
    		Always
    		10 to 14 V
    +B (c7-5)*2 - GND (c7-1)*2
    		L - W-B
    		+B (+B) power supply
    		Always
    		10 to 14 V
    SYSB (d7-8)*1 - Body ground
    		G - Body ground
    		+B (SYSB) power supply
    		Always
    		10 to 14 V
    SYSB (c7-8)*2 - Body ground
    		R - Body ground
    		+B (SYSB) power supply
    		Always
    		10 to 14 V
    MPX1 (d7-1)*1 - Body ground
    		G-R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX1 (c7-1)*2 - Body ground
    		P - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (d8-1)*1 - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    GND (c6-1)*2 - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    HINT:
    *1: LHD
    *2: RHD
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK NO. 2 AIR CONDITIONING AMPLIFIER ASSEMBLY (A/C ECU)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L52 amplifier connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (L52-1) - GND (L52-20)
    		L - W-B
    		+B power supply
    		Always
    		10 to 14 V
    IG+ (L52-21) - Body ground
    		W - Body ground
    		Engine switch signal (IG)
    		Engine switch on (IG)
    		10 to 14 V
    MPX+ (L52-30) - Body ground
    		SB - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX- (L52-31) - Body ground
    		Y - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND (L52-20) - 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 AIRBAG SENSOR ASSEMBLY CENTER

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L44 sensor connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG2 (L44-21) - E1(L44-25)
    		B - W-B
    		Engine switch signal (IG)
    		Engine switch on (IG)
    		10 to 14 V
    MPX1 (L44-13) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (L44-22) - Body ground
    		R - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E1 (L44-25) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    E2 (L44-26) - 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)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L31 meter connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (L31-21) - Body ground
    		B - Body ground
    		+B (B) power supply
    		Always
    		10 to 14 V
    B (L31-22) - Body ground
    		L - Body ground
    		+B (B) power supply
    		Always
    		10 to 14 V
    MPX+ (L31-25) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX- (L31-5) - Body ground
    		SB - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E2 (L31-40) - 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 SUB-ASSEMBLY (SLIDING ROOF CONTROL ECU)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the Y11 driver gear connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (Y11-5) - E (Y11-7)
    		L - W-B
    		+B (B) power supply
    		Always
    		10 to 14 V
    MPX1 (Y11-10) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E (Y11-7) - 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

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L27 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    ECUB (L27-9) - GND (L27-11)
    		R - W-B
    		+B (ECUB) power supply
    		Always
    		11 to 14 V
    +B (L27-2) - GND (L27-11)
    		L - W-B
    		+B (+B) power supply
    		Always
    		11 to 14 V
    MPX1 (L27-5) - Body ground
    		GR - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E (L27-11) - 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 COMBINATION SWITCH ASSEMBLY (WINDSHIELD WIPER SWITCH)

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L22 switch connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    B (L22-1) - E (L22-5)
    		GR - W-B
    		+B (B) power supply
    		Always
    		10 to 14 V
    MPX1 (L22-6) - Body ground
    		G*1, O*2 - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (L22-7) - Body ground
    		O*1, G*2 - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    E (L22-5) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    HINT:
    *1: LHD
    *2: RHD
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the S5 switch connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    CPUB (S5-9) - E (S5-2)
    		G - W-B
    		+B (CPUB) power supply
    		Always
    		10 to 14 V
    E (S5-2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    MPX1 (S5-7) - E (S5-2)
    		GR - W-B
    		MPX line
    		Always
    		Below 1 Ω
    MPX2 (S5-8) - E (S5-2)
    		P - W-B
    		MPX line
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction on the wire harness side.

CHECK POWER SOURCE CONTROL ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L73 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    AM1 (L73-33) - GND2 (L73-6)
    		O - W-B
    		+B power supply
    		Always
    		10 to 14 V
    AM2 (L73-12) - GND2 (L73-6)
    		BR - W-B
    		+B power supply
    		Always
    		10 to 14 V
    MPX1 (L73-7) - Body ground
    		LG - Body ground
    		MPX line
    		Always
    		10 kΩ or higher
    GND2 (L73-6) - 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 CERTIFICATION ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the V28 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    +B1 (V28-1) - E (V28-17)
    		R - W-B
    		B power supply
    		Always
    		10 to 14 V
    MPX1 (V28-27) - E (V28-17)
    		BR - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (V28-28) - E (V28-17)
    		GR - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    E (V28-17) - 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 TIRE PRESSURE WARNING ECU

Lexus Gs430, Gs300. Uzs190 Grs190.Multiplex Communication.Multiplex Communication System.Multiplex Communication System Terminals Of Ecu

  1. Disconnect the L45 ECU connector.

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

    Symbols (Terminal No.)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    IG (L45-1) - GND (L45-7)
    		G - W-B
    		Power supply
    		Always
    		10 to 14 V
    MPX1 (L45-6) - GND (L45-7)
    		LG - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    MPX2 (L45-12) - GND (L45-7)
    		GR - W-B
    		MPX line
    		Always
    		10 kΩ or higher
    GND (L45-7 ) - 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.