LIGHTING SYSTEM(w/ Automatic Headlight Beam Level Control System) TERMINALS OF ECU


  1. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    B0070ETC06
    *A for LHD *B for RHD

    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
      3B-3 - Body ground LA - Body ground Ground Always Below 1 Ω
      3B-23 - Body ground*1 BE - Body ground Battery power supply Always 11 to 14 V
      3C-1 - Body ground*2 LG - Body ground Battery power supply Always 11 to 14 V
      3F-1 - Body ground*3

      W - Body ground*5

      B - Body ground*6

      		 Battery power supply Always 11 to 14 V
      3G-1 - Body ground*4 W - Body ground Battery power supply Always 11 to 14 V

      • *1: w/ Door Control Battery

      • *2: w/o Door Control Battery

      • *3: for LHD

      • *4: for RHD

      • *5: Alternator 100A Type

      • *6: Alternator 130A Type

    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 Ignition switch off Below 1 V
      Ignition switch ACC 11 to 14 V
      3C-19 - Body ground BE - Body ground BKUP LP relay drive output Ignition switch off, shift lever not in R Below 1 V
      Ignition switch ON, shift lever in R 11 to 14 V
      3C-23 - Body ground LA-P - Body ground BKUP LP relay drive output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      3C-25 - Body ground*1 BE - Body ground FOG FR relay drive output Light control switch in tail or head position, fog light switch in front position Below 1 V
      Light control switch in tail or head position, fog light switch off position 11 to 14 V
      3C-31 - Body ground V - Body ground H-LP LH relay drive output

      • Ignition switch ON or within 15 seconds after ignition switch turned off

      • Light control switch in tail or head position

      		 Below 1 V

      • 15 seconds or more after ignition switch turned off

      • Light control switch off

      		 11 to 14 V
      3C-32 - Body ground*1 LA-B - Body ground Tail signal output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      3D-10 - Body ground LG - Body ground Back-up lights drive output Ignition switch off, shift lever not in R Below 1 V
      Ignition switch ON, shift lever in R 11 to 14 V
      3D-21 - Body ground*2 LG - Body ground Rear fog light drive output Light control switch in tail or head position, fog light switch in rear position 11 to 14 V
      Light control switch in tail or head position, fog light switch off position Below 1 V
      3D-30 - Body ground LA-B - Body ground Taillights, rear side marker lights*4 and license plate lights drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      K51-19 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K51-23 (AHID) - Body ground*3 BE - Body ground Auto high beam switch indicator drive output Ignition switch ON, auto high beam switch on Below 1 V
      Ignition switch ON, auto high beam switch off 11 to 14 V
      K52-12 (HRY2) - Body ground BE - Body ground H-LP RH relay drive output

      • Ignition switch ON or within 15 seconds after ignition switch turned off

      • Light control switch in tail or head position

      		 Below 1 V

      • 15 seconds or more after ignition switch turned off

      • Light control switch off

      		 11 to 14 V
      K52-16 (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
      K52-23 (CLTB) - K52-25 (CLTE) BE - GR Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      K52-24 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Ignition switch ON

      Pulse generation

      (See waveform 1)
      K52-26 (AHBI) - Body ground*3 B - Body ground Auto high beam switch signal input Auto high beam switch on Below 1 V
      Auto high beam switch off 11 to 14 V

      • *1: w/ Front Fog Light

      • *2: w/ Rear Fog Light

      • *3: w/ Automatic High Beam System

      • *4: w/ Rear Side Marker Light


      1. B0070APN01

        Waveform 1

        Item Content
        Tester Connection K52-24 (CLTS) - Body ground
        Tool setting 2 V/DIV., 10 ms./DIV.
        Condition Ignition switch ON

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for Bulb Type Turn Signal Light)

    B006Y4YE11

    1. Disconnect the A10 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
      A10-4 (IG) - Body ground B - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A10-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A10-13 (ECUB) - Body ground B - Body ground Battery power supply

      • 15 seconds or more after ignition switch turned off

      • Light control switch off

      		 Below 1 V

      • Ignition switch ON or within 15 seconds after ignition switch turned off

      • Light control switch in tail or head position

      		 9.5 to 14 V

    3. Connect the A10 headlight ECU sub-assembly LH connector.

      Tech Tips


      • Since the A10 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 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
      A10-11 (TNS) - Body ground LA-LG - Body ground Front turn signal light signal input Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A10-16 (SBR) - A10-15 (SGR) LG - G Rear height control sensor sub-assembly LH power supply Ignition switch ON 4.75 to 5.25 V
      A10-17 (SHRL) - A10-15 (SGR) BE - G Rear height control sensor sub-assembly LH signal input Ignition switch ON, vehicle unloaded, vehicle stopped

      Approximately 2.5 V

      (value decreases as the front of the vehicle is raised)
      A10-23 (CANL) - Body ground W - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      A10-24 (CANH) - Body ground P - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      B-4 (LOLED2) - B-3 (LOLED0) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 10 to 16 V
      B-6 (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-7 (ACTBI) - B-17 (ACTGI) - Headlight leveling motor power source Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      B-8 (ACTSI) - B-17 (ACTGI) - Headlight leveling motor signal output Ignition switch ON, low beam headlights on, vehicle height not changed Below 1 V
      Ignition switch ON, low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14 V
      B-9 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-10 (HI+) - B-1 (HI-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights 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-19 (CLL+) - B-11 (DRL-) - Clearance lights/daytime running lights control signal output Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on 11 to 14 V
      B-20 (DRL+) - B-11 (DRL-) - Clearance lights/daytime running lights power source Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on 11 to 14 V

  3. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for LED Type Turn Signal Light)

    B006Y4YE11

    1. Disconnect the A10 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
      A10-4 (IG) - Body ground B - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A10-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A10-13 (ECUB) - Body ground B - Body ground Battery power supply

      • 15 seconds or more after ignition switch turned off

      • Light control switch off

      		 Below 1 V

      • Ignition switch ON or within 15 seconds after ignition switch turned off

      • Light control switch in tail or head position

      		 9.5 to 14 V

    3. Connect the A10 headlight ECU sub-assembly LH connector.

      Tech Tips


      • Since the A10 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 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
      A10-11 (TNS) - Body ground LA-LG - Body ground Front turn signal light signal input Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A10-16 (SBR) - A10-15 (SGR) LG - G Rear height control sensor sub-assembly LH power supply Ignition switch ON 4.75 to 5.25 V
      A10-17 (SHRL) - A10-15 (SGR) BE - G Rear height control sensor sub-assembly LH signal input Ignition switch ON, vehicle unloaded, vehicle stopped

      Approximately 2.5 V

      (value decreases as the front of the vehicle is raised)
      A10-23 (CANL) - Body ground W - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      A10-24 (CANH) - Body ground P - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      B-4 (LOLED2) - B-5 (LOLED1) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 10 to 16 V
      B-6 (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-7 (ACTBI) - B-17 (ACTGI) - Headlight leveling motor power source Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      B-8 (ACTSI) - B-17 (ACTGI) - Headlight leveling motor signal output Ignition switch ON, low beam headlights on, vehicle height not changed Below 1 V
      Ignition switch ON, low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14 V
      B-9 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-10 (HI+) - B-1 (HI-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights 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-11 (DRL-) - Clearance lights/daytime running lights control signal output Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on Pulse generation
      B-20 (DRL+) - B-11 (DRL-) - Clearance lights/daytime running lights power source Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on 11 to 14 V

  4. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for Bulb Type Turn Signal Light)

    B006Y4YE12

    1. Disconnect the A11 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
      A11-4 (IG) - Body ground B - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A11-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A11-13 (ECUB) - Body ground BE - Body ground Battery power supply

      • 15 seconds or more after ignition switch turned off

      • Light control switch off

      		 Below 1 V

      • Ignition switch ON or within 15 seconds after ignition switch turned off

      • Light control switch in tail or head position

      		 9.5 to 14 V

    3. Connect the A11 headlight ECU sub-assembly RH connector.

      Tech Tips


      • Since the A11 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 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
      A11-7 (HLC) - Body ground* W - Body ground Headlight cleaner motor operation signal Ignition switch ON, light control switch head and headlight cleaner motor not operating 11 to 14 V
      Ignition switch ON, light control switch head and headlight cleaner operating Below 1.5 V
      A11-11 (TNS) - Body ground LA-G - Body ground Front turn signal light signal input Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A11-23 (CANL) - Body ground W - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      A11-24 (CANH) - Body ground L - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      B-4 (LOLED2) - B-3 (LOLED0) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 10 to 16 V
      B-6 (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-7 (ACTBI) - B-17 (ACTGI) - Headlight leveling motor power source Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      B-8 (ACTSI) - B-17 (ACTGI) - Headlight leveling motor signal output Ignition switch ON, low beam headlights on, vehicle height not changed Below 1 V
      Ignition switch ON, low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14 V
      B-9 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-10 (HI+) - B-1 (HI-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights 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-19 (CLL+) - B-11 (DRL-) - Clearance lights/daytime running lights control signal output Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on 11 to 14 V
      B-20 (DRL+) - B-11 (DRL-) - Clearance lights/daytime running lights power source Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on 11 to 14 V

      • *: w/ Headlight Cleaner System

  5. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for LED Type Turn Signal Light)

    B006Y4YE12

    1. Disconnect the A11 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
      A11-4 (IG) - Body ground B - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A11-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      A11-13 (ECUB) - Body ground BE - Body ground Battery power supply

      • 15 seconds or more after ignition switch turned off

      • Light control switch off

      		 Below 1 V

      • Ignition switch ON or within 15 seconds after ignition switch turned off

      • Light control switch in tail or head position

      		 9.5 to 14 V

    3. Connect the A11 headlight ECU sub-assembly RH connector.

      Tech Tips


      • Since the A11 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 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
      A11-7 (HLC) - Body ground* W - Body ground Headlight cleaner motor operation signal Ignition switch ON, light control switch head and headlight cleaner motor not operating 11 to 14 V
      Ignition switch ON, light control switch head and headlight cleaner operating Below 1.5 V
      A11-11 (TNS) - Body ground LA-G - Body ground Front turn signal light signal input Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      A11-23 (CANL) - Body ground W - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      A11-24 (CANH) - Body ground L - Body ground CAN communication line Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      B-4 (LOLED2) - B-5 (LOLED1) - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 10 to 16 V
      B-6 (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-7 (ACTBI) - B-17 (ACTGI) - Headlight leveling motor power source Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      B-8 (ACTSI) - B-17 (ACTGI) - Headlight leveling motor signal output Ignition switch ON, low beam headlights on, vehicle height not changed Below 1 V
      Ignition switch ON, low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14 V
      B-9 (TURN+) - B-13 (TURN-) - Front turn signal light signal output Ignition switch ON, front turn signal light off Below 1 V
      Ignition switch ON, front turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-10 (HI+) - B-1 (HI-) - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights 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-11 (DRL-) - Clearance lights/daytime running lights control signal output Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on Pulse generation
      B-20 (DRL+) - B-11 (DRL-) - Clearance lights/daytime running lights power source Clearance lights and daytime running lights off Below 1 V
      Clearance lights and daytime running lights on 11 to 14 V

      • *: w/ Headlight Cleaner System

  6. CHECK COMBINATION METER ASSEMBLY

    Click here

  7. CHECK FORWARD RECOGNITION CAMERA (w/ Automatic High Beam System)

    Click here

  8. CHECK STEERING SENSOR

    Click here