LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2020 >> ES 300h Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Lighting System (Ext) (Except Hybrid) - Diagnostics - Introduction (2 Of 3)) >> LIGHTING SYSTEM (for Gasoline Model) >> Terminals Of Ecu [08/2021 - ] >> Terminals Of Ecu [08/2021 - ]

Terminals Of Ecu [08/2021 - ]

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 250, 2023 Lexus ES 350, 2023 Lexus ES 250, and 2022 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    Fig 1: Instrument Panel Junction Block Assembly And Main Body ECU (Multiplex Network Body ECU) Connector End View
    GTY820116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
    2. Measure the voltage and resistance according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3D-3 - Body ground LA - Body ground Ground Always Below 1 Ω
      3F-1 - Body ground LG - Body ground Battery power supply Always 11 to 14 V
      3K-1 - Body ground B - Body ground Battery power supply Always 11 to 14 V
    3. Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.
    4. Measure the voltage and resistance, and check for pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3A-40 - Body ground LA-G - Body ground BKUP LP relay drive output Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
      3F-19 - Body ground BE - Body ground BKUP LP relay drive output Engine switch off, reverse (R) not selected Below 1 V
      Engine switch on (IG), reverse (R) selected 11 to 14 V
      3F-23 - Body ground L - Body ground BKUP LP relay drive output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      3F-31 - Body ground V - Body ground H-LP LH relay drive output
      • Engine switch on (IG) or within 15 seconds after engine switch turned off
      • Taillights on
      		 Below 1 V
      • 15 seconds or more after engine switch turned off
      • Taillights off
      		 11 to 14 V
      3H-10 - Body ground LG - Body ground Back-up lights drive output Engine switch off, reverse (R) not selected Below 1 V
      Engine switch on (IG), reverse (R) selected 11 to 14 V
      3H-30 - Body ground B - Body ground Taillights, rear side marker lights and license plate lights drive output Taillights on 11 to 14 V
      Taillights off Below 1 V
      G36-19 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      G37-12 (HRY2) - Body ground BE - Body ground H-LP RH relay drive output
      • Engine switch on (IG) or within 15 seconds after engine switch turned off
      • Taillights on
      		 Below 1 V
      • 15 seconds or more after engine switch turned off
      • Taillights off
      		 11 to 14 V
      G37-16 (HEAD) - Body ground LG - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      G37-23 (CLTB) - G37-25 (CLTE) L - GR Automatic light control sensor power supply output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      G37-24 (CLTS) - Body ground LG - Body ground Automatic light control sensor signal input Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      (See waveform 1)
      G38-2 (MILE) - Body ground B - Body ground Outside handle foot lights drive output Outside handle foot light illuminates 11 to 14 V
      Outside handle foot light off Below 3 V
      1. Waveform 1
        Fig 2: Waveform 1
        GTY442965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Item Content
        Tester Connection G37-24 (CLTS) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Condition Engine switch on (IG)

        HINT: 

        The communication waveform changes according to the surrounding brightness.

  2. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for LED Type Turn Signal Light) 
    Fig 3: A78 Headlight ECU Sub-Assembly LH Connectors
    GTY959332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A78 headlight ECU sub-assembly LH connector.
    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A78-4 (IG) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A78-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A78-13 (ECUB) - Body ground B - Body ground Battery power supply
      • 15 seconds or more after engine switch turned off
      • Taillights off
      		 Below 1 V
      • Engine switch on (IG) or within 15 seconds after engine switch turned off
      • Taillights on
      		 9.5 to 14 V
    3. Connect the A78 headlight ECU sub-assembly LH connector.

      HINT: 

      • Since the A78 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
      • Since the B and C headlight ECU sub-assembly LH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
    4. Measure the voltage and check of pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A78-11 (TNS) - Body ground LG - Body ground Front turn signal light signal input Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A78-16 (SBR) - A78-15 (SGR) LG - G Rear height control sensor sub-assembly LH power supply Engine switch on (IG) 4.75 to 5.25 V
      A78-17 (SHRL) - A78-15 (SGR) BE - G Rear height control sensor sub-assembly LH signal input Engine switch on (IG), vehicle unloaded, vehicle stopped Approximately 2.5 V
      (value decreases as the front of the vehicle is raised)
      A78-20 (LINL) - Body ground W - Body ground LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A78-23 (CANL) - Body ground W - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A78-24 (CANH) - Body ground R - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-2 (LOLED2) - B-3 (LOLED1) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 21.4 to 30.45 V
      B-4 (FANB) - B-14 (FANG) - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.75 to 5.25 V
      B-6 (HILED2) - B-5 (HILED1) - Cornering lights drive output Cornering lights off Below 1 V
      Cornering lights on 6.1 to 8.6 V
      B-9 (ACTBI) - B-17 (ACTGI) - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-10 (DRL/CLL+) - B-1 (DRL/CLL-) - Parking lights/daytime running lights power source Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on 11 to 14 V
      B-15 (FANP) - B-14 (FANG) - Headlight fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-16 (PWM1) - B-1 (DRL/CLL-) - Parking lights/daytime running lights control signal output Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on Pulse generation
      B-18 (FSML+) - B-12 (FSML-) - Front side marker lights drive output Front side marker lights off Below 1 V
      Front side marker lights on 11 to 14 V
      B-19 (HI_SOL+) - B-11 (HI_SOL-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-20 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
      C-13 (LINLI) - Body ground - LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
  3. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for Bulb Type Turn Signal Light) 
    Fig 4: A78 headlight ECU Sub-Assembly LH Connector.
    GTY959358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A78 headlight ECU sub-assembly LH connector.
    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A78-4 (IG) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A78-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A78-13 (ECUB) - Body ground B - Body ground Battery power supply
      • 15 seconds or more after engine switch turned off
      • Taillights off
      		 Below 1 V
      • Engine switch on (IG) or within 15 seconds after engine switch turned off
      • Taillights on
      		 9.5 to 14 V
    3. Connect the A78 headlight ECU sub-assembly LH connector.

      HINT: 

      • Since the A78 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
      • Since the B headlight ECU sub-assembly LH connector are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
    4. Measure the voltage and check of pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A78-11 (TNS) - Body ground LG - Body ground Front turn signal light signal input Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A78-23 (CANL) - Body ground W - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A78-24 (CANH) - Body ground R - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-2 (LOLED2) - B-3 (LOLED1) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 13.37 to 19.04 V
      B-6 (HILED2) - B-5 (HILED1) - Cornering lights drive output Cornering lights off Below 1 V
      Cornering lights on 7.99 to 11.8 V
      B-10 (DRL/CLL+) - B-1 (DRL/CLL-) - Parking lights/daytime running lights power source Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on 11 to 14 V
      B-16 (PWM1) - B-1 (DRL/CLL-) - Parking lights/daytime running lights control signal output Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on Pulse generation
      B-18 (FSML+) - B-12 (FSML-) - Front side marker lights drive output Front side marker lights off Below 1 V
      Front side marker lights on 11 to 14 V
      B-19 (HI_SOL+) - B-11 (HI_SOL-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-20 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
  4. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for LED Type Turn Signal Light) 
    Fig 5: A79 Headlight ECU Sub-Assembly RH Connectors
    GTY959397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A79 headlight ECU sub-assembly RH connector.
    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A79-4 (IG) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A79-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A79-13 (ECUB) - Body ground R - Body ground Battery power supply
      • 15 seconds or more after engine switch turned off
      • Taillights off
      		 Below 1 V
      • Engine switch on (IG) or within 15 seconds after engine switch turned off
      • Taillights on
      		 9.5 to 14 V
    3. Connect the A79 headlight ECU sub-assembly RH connector.

      HINT: 

      • Since the A79 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
      • Since the B and C headlight ECU sub-assembly RH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
    4. Measure the voltage and check of pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A79-11 (TNS) - Body ground G - Body ground Front turn signal light signal input Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A79-20 (LINL) - Body ground W - Body ground LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A79-23 (CANL) - Body ground W - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A79-24 (CANH) - Body ground L - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-2 (LOLED2) - B-3 (LOLED1) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 21.4 to 30.45 V
      B-4 (FANB) - B-14 (FANG) - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.75 to 5.25 V
      B-6 (HILED2) - B-5 (HILED1) - Cornering lights drive output Cornering lights off Below 1 V
      Cornering lights on 6.1 to 8.6 V
      B-9 (ACTBI) - B-17 (ACTGI) - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-10 (DRL/CLL+) - B-1 (DRL/CLL-) - Parking lights/daytime running lights power source Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on 11 to 14 V
      B-15 (FANP) - B-14 (FANG) - Headlight fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-16 (PWM1) - B-1 (DRL/CLL-) - Parking lights/daytime running lights control signal output Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on Pulse generation
      B-18 (FSML+) - B-12 (FSML-) - Front side marker lights drive output Front side marker lights off Below 1 V
      Front side marker lights on 11 to 14 V
      B-19 (HI_SOL+) - B-11 (HI_SOL-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-20 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
      C-13 (LINLI) - Body ground - LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
  5. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for Bulb Type Turn Signal Light) 
    Fig 6: A79 Headlight ECU Sub-Assembly RH Connectors
    GTY959361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A79 headlight ECU sub-assembly RH connector.
    2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A79-4 (IG) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A79-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A79-13 (ECUB) - Body ground R - Body ground Battery power supply
      • 15 seconds or more after engine switch turned off
      • Taillights off
      		 Below 1 V
      • Engine switch on (IG) or within 15 seconds after engine switch turned off
      • Taillights on
      		 9.5 to 14 V
    3. Connect the A79 headlight ECU sub-assembly RH connector.

      HINT: 

      • Since the A79 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.
      • Since the B headlight ECU sub-assembly RH connector are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.
    4. Measure the voltage and check of pulses according to the value(s) in the table below.
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A79-11 (TNS) - Body ground G - Body ground Front turn signal light signal input Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A79-23 (CANL) - Body ground W - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A79-24 (CANH) - Body ground L - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-2 (LOLED2) - B-3 (LOLED1) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 13.37 to 19.04 V
      B-6 (HILED2) - B-5 (HILED1) - Cornering lights drive output Cornering lights off Below 1 V
      Cornering lights on 7.99 to 11.8 V
      B-10 (DRL/CLL+) - B-1 (DRL/CLL-) - Parking lights/daytime running lights power source Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on 11 to 14 V
      B-16 (PWM1) - B-1 (DRL/CLL-) - Parking lights/daytime running lights control signal output Parking lights and daytime running lights off Below 1 V
      Parking lights and daytime running lights on Pulse generation
      B-18 (FSML+) - B-12 (FSML-) - Front side marker lights drive output Front side marker lights off Below 1 V
      Front side marker lights on 11 to 14 V
      B-19 (HI_SOL+) - B-11 (HI_SOL-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-20 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Engine switch on (IG), front turn signal light off Below 1 V
      Engine switch on (IG), front turn signal light blinking 11 to 14 V ←→ Below 1 V
  6. CHECK COMBINATION METER ASSEMBLY 

    Refer to TERMINALS OF ECU [08/2021 - ]

  7. CHECK FORWARD RECOGNITION CAMERA 

    Refer to TERMINALS OF ECU [08/2021 - ]

  8. CHECK STEERING SENSOR 

    Refer to TERMINALS OF ECU [08/2021 - 09/2022] , or refer to TERMINALS OF ECU [09/2022 - ]

scientia non olet · About LEMON Manuals