LIGHTING SYSTEM(for LED Headlight) TERMINALS OF ECU


  1. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B001CIBC01
    *A Main Body ECU (Multiplex Network Body ECU) with 3 connectors *B for LHD
    *C for RHD - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    B001HRGC01
    *A Main Body ECU (Multiplex Network Body ECU) with 2 connectors *B for LHD
    *C for RHD - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

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    2. Connect the driver side junction block assembly connectors.

    3. Measure the voltage and resistance according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-32 (IG) - Body ground Note - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A-31 (BECU) - Body ground Note - Body ground Battery power supply Always 11 to 14 V
      A-30 (ACC) - Body ground Note - Body ground ACC power supply Ignition switch ACC 11 to 14 V
      Ignition switch off Below 1 V
      A-11 (GND1) - Body ground Note - Body ground Ground Always Below 1 Ω

    4. Install the main body ECU (multiplex network body ECU).

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    5. Measure the voltage and pulse according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G216-23 (AHBI) - Body ground*5 P - 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
      G218-1 (DIM) - Body ground P - Body ground H-LP HI relay drive output Ignition switch ON Below 1 V
      Ignition switch off 11 to 14 V
      G218-8 (A) - Body ground W - Body ground Light control switch Auto position signal input Light control switch in Auto position Below 1 V
      Light control switch not in Auto position 11 to 14 V
      G218-10 (HF) - Body ground V - Body ground Headlight dimmer switch high flash position signal input Headlight dimmer switch in high flash position Below 1 V
      Headlight dimmer switch not in high flash position 11 to 14 V
      G218-12 (HEAD) - Body ground SB - Body ground Light control switch head position signal input Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      G218-19 (CLTB) - G218-21 (CLTE) P - L Automatic light control sensor power supply output Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      G218-20 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Ignition switch off Below 1 V
      Automatic light control system operating

      Pulse generation

      (See waveform 1)
      G218-22 (TAIL) - Body ground W - Body ground Light control switch tail position signal input Light control switch in tail or head position Below 1 V
      Light control switch not in tail or head position 11 to 14 V
      G218-23 (RFOG) - Body ground*1 SB - Body ground Fog light switch rear position input Fog light switch in rear position Below 1 V
      Fog light switch off 11 to 14 V
      G218-24 (HU) - Body ground LG - Body ground Headlight dimmer switch high position signal input Headlight dimmer switch in high flash position Below 1 V
      Headlight dimmer switch not in high flash position 11 to 14 V
      G218-26 (FFOG) - Body ground*2 G - Body ground Fog light switch front position input Fog light switch in front position Below 1 V
      Fog light switch off 11 to 14 V
      2Q-31 - Body ground*3 LG - Body ground Taillight drive output Light control switch in tail or head position Below 1 V
      Light control switch off 11 to 14 V
      2N-9 - Body ground*4 LG - Body ground Taillight drive output Light control switch in tail or head position Below 1 V
      Light control switch off 11 to 14 V
      2M-17 (HRLY) - Body ground GR - Body ground H-LP LO relay drive output Ignition switch ON Below 1 V
      Ignition switch off 11 to 14 V
      2Q-11 - Body ground*1, *3 G - Body ground Rear fog light drive output Light control switch in tail or head position, fog light switch off Below 1 V
      Light control switch in tail or head position, fog light switch in rear position 11 to 14 V
      2P-11 - Body ground*1, *4 G - Body ground Rear fog light drive output Light control switch in tail or head position, fog light switch off Below 1 V
      Light control switch in tail or head position, fog light switch in rear position 11 to 14 V
      2M-19 - Body ground*2 W - Body ground Front fog light drive output Light control switch in tail or head position, fog light switch off Below 1 V
      Light control switch in tail or head position, fog light switch in front position 11 to 14 V

      *1: w/ Rear Fog Light

      *2: w/ Front Fog Light

      *3: for LHD

      *4: for RHD

      *5: w/ Automatic High Beam System

    6. B001ELCE04

      Waveform 1

      Item Content
      Terminal No. (Symbol) G218-20 (CLTS) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Condition Automatic light control system operating

      Tech Tips

      The communication waveform changes according to the surrounding brightness.

  2. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH

    B001E1NN31

    1. Disconnect the A102 No. 1 headlight ECU sub-assembly LH connector.

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A102-4 (IG) - Body ground GR - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A102-13 (ECUB) - Body ground R - Body ground Power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A102-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A102 No. 1 headlight ECU sub-assembly LH connector.

      Tech Tips


      • Since the A102 No. 1 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 No. 1 headlight ECU sub-assembly LH connector is 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
      A102-11 (TNS) - Body ground V - Body ground Left turn signal light signal input Ignition switch ON, left turn signal light off Below 1 V
      Ignition switch ON, left turn signal light blinking 11 to 14 V ←→ Below 1 V
      A102-16 (SBR) - A102-15 (SGR)* R-G - W Rear height control sensor power supply Ignition switch off Below 1 V
      Ignition switch ON 4.5 to 5.5 V
      A102-17 (SHRL) - A102-15 (SGR)* B-R - W Rear height control sensor signal input Ignition switch ON, vehicle unloaded, vehicle stopped Approximately 2.5 V (value decreases as the rear of the vehicle is lowered)
      B-4 - B-3 - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 13.47 to 19.62 V
      B-7 - B-17 - Headlight leveling motor power source Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      B-9 - B-13 - Left turn signal light signal output Ignition switch ON, left turn signal light off Below 1 V
      Ignition switch ON, left turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-16 - B-11 - Clearance lights/daytime running lights control signal output Clearance light and daytime running light off Below 1 V
      Clearance light and daytime running light on Pulse generation
      B-20 - B-11 - Clearance lights/daytime running lights power source Clearance light and daytime running light off Below 1 V
      Clearance light and daytime running light on 11 to 14 V
      C-8 - C-7 - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 8.11 to 11.75 V

      *: w/o Air Suspension System

  3. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH

    B001E1NN30

    1. Disconnect the A103 No. 1 headlight ECU sub-assembly RH connector.

    2. Measure the resistance and voltage according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A103-4 (IG) - Body ground GR - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A103-13 (ECUB) - Body ground G-B - Body ground Power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A103-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A103 No. 1 headlight ECU sub-assembly RH connector.

      Tech Tips


      • Since the A103 No. 1 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 No. 1 headlight ECU sub-assembly RH connector is 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
      A103-11 (TNS) - Body ground G - Body ground Right turn signal light signal input Ignition switch ON, right turn signal light off Below 1 V
      Ignition switch ON, right turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-4 - B-3 - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 13.47 to 19.62 V
      B-7 - B-17 - Headlight leveling motor power source Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      B-9 - B-13 - Left turn signal light signal output Ignition switch ON, left turn signal light off Below 1 V
      Ignition switch ON, left turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-16 - B-11 - Clearance lights/daytime running lights control signal output Clearance light and daytime running light off Below 1 V
      Clearance light and daytime running light on Pulse generation
      B-20 - B-11 - Clearance lights/daytime running lights power source Clearance light and daytime running light off Below 1 V
      Clearance light and daytime running light on 11 to 14 V
      C-8 - C-7 - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 8.11 to 11.75 V

  4. CHECK COMBINATION METER ASSEMBLY

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