LIGHTING SYSTEM TERMINALS OF ECU


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

    B005Z3VC42
    *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
      2B-6 - Body ground W-B - Body ground Ground Always Below 1 Ω
      2C-18 - Body ground Y - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      2E-1 - Body ground*1 W - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      2F-1 - Body ground*2 W - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      L190-3 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Connect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

    4. Measure the voltage and check for pulses according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2B-7 - Body ground G - Body ground Taillights and rear side marker lights drive output Light control switch not in tail position Below 1 V
      Light control switch in tail position 11 to 14 V
      2B-26 - Body ground Y - Body ground Rear fog light drive output Light control switch in tail position, fog light switch in rear position Below 1 V
      Light control switch in tail position, fog light switch off 11 to 14 V
      2C-8 - Body ground LG - Body ground Front fog lights drive output Light control switch in tail or head position, fog light switch in front position 11 to 14 V
      Light control switch in tail or head position, fog light switch off Below 1 V
      2C-10 - Body ground BR - Body ground Parking lights and front side marker lights drive output Light control switch not in tail position Below 1 V
      Light control switch in tail position 11 to 14 V
      2C-20 - Body ground R - Body ground Parking brake switch input Parking brake switch on Below 1 V
      Parking brake switch off 11 to 14 V
      2C-22 - Body ground Y - Body ground High beam headlights drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V
      2C-32 - Body ground G - Body ground No. 1 integration relay drive output Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      2D-18 - Body ground BR - Body ground Taillights, rear side marker lights and license plate lights drive output Light control switch not in tail position Below 1 V
      Light control switch in tail position 11 to 14 V
      L201-1 (RFOG) - Body ground W - Body ground Rear fog light switch input Rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      L201-5 (HU) - Body ground LG - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position 11 to 14 V
      L201-8 (HF) - Body ground R - Body ground Dimmer switch high flash position signal input Dimmer switch in high flash position Below 1 V
      Dimmer switch not in high flash position 11 to 14 V
      L201-15 (DRLE) - Body ground Y - Body ground Daytime running light system drive output Daytime running light system operates Below 1 V
      Daytime running light system not operates 11 to 14 V
      L201-20 (CLTB) - L201-22 (CLTE)*3 R - B Automatic light control sensor power supply output Power switch off Below 1 V
      Power switch on (IG) and light control switch in AUTO position 11 to 14 V
      L201-21 (CLTS) - Body ground*3 W - Body ground Automatic light control sensor signal input Power switch off Below 1 V
      Power switch on (IG) and automatic light control system operates

      Pulse generation

      (See waveform 1)
      L201-27 (FFOG) - Body ground SB - Body ground Front fog light switch input Front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      L201-28 (A) - Body ground*3 G - 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
      L201-29 (HEAD) - Body ground P - 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
      L201-30 (TAIL) - Body ground Y - 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
      L190-17 (AHBI) - Body ground*4 R - Body ground Auto high beam switch signal input Integration control and panel assembly (auto high beam switch) on Below 1 V
      Integration control and panel assembly (auto high beam switch) off 11 to 14 V
      L190-21 (RLEW) - Body ground*5 L - Body ground Light control ECU RH signal input Power switch on (IG) and light control switch off 11 to 14 V
      Power switch on (IG) and light control switch in head position Pulse generation
      L190-24 (LLEW) - Body ground*5 B - Body ground Light control ECU LH signal input Power switch on (IG) and light control switch off 11 to 14 V
      Power switch on (IG) and light control switch in head position Pulse generation

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Automatic Light Control

      • *4: w/ Automatic High Beam System

      • *5: for LED Headlight


      1. B005ZFPN16

        Waveform 1

        Item Content
        Tester Connection L201-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition Power switch on (IG) and automatic light control system operates

        Tech Tips

        If the ambient light becomes brighter, width (A) becomes narrower.

  2. CHECK HEADLIGHT LEVELING ECU ASSEMBLY (for LED Headlight)

    B005YN6N01

    1. Disconnect the A48 headlight leveling ECU assembly connector.

    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
      A48-1 (IG) - Body ground LG - Body ground IG power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A48-9 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Connect the A48 headlight leveling ECU assembly connector.

    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
      A48-3 (HDLP) - Body ground V - Body ground Low beam headlight signal input Low beam headlights on Below 1.5 V
      Low beam headlights off Above 5 V
      A48-5 (INIT) - Body ground B - Body ground Initialization signal input Terminals LVL and GND of DLC3 connected Below 1 V
      Terminals LVL and GND of DLC3 not connected Approximately 5 V
      A48-6 (WNG) - Body ground L - Body ground Warning light drive output Warning light on Below 1 V
      Warning light off 11 to 14 V
      A48-10 (RH+) - Body ground W - Body ground Leveling motor RH power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A48-11 (LH+) - Body ground R - Body ground Leveling motor LH power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A48-12 (SBR) - Body ground P - Body ground Rear height control sensor power supply Power switch off Below 1 V
      Power switch on (IG) 4.75 to 5.25 V
      A48-16 (SPDR) - Body ground V - Body ground Vehicle speed signal input Vehicle is driven at approximately 20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      A48-17 (RHT) - Body ground B - Body ground Leveling motor RH operation signal input With low beam headlights on, vehicle height not changed Below 1 V
      With low beam headlights on, change vehicle height and keep for more than 3 seconds 1.0 to 14.4 V
      A48-18 (LHT) - Body ground G - Body ground Leveling motor LH operation signal input With low beam headlights on, vehicle height not changed Below 1 V
      With low beam headlights on, change vehicle height and keep for more than 3 seconds 1.0 to 14.4 V
      A48-19 (SHRL) - Body ground SB - Body ground Rear height control sensor signal input Power switch off Below 1 V
      Power switch on (IG) 0.5 to 4.5 V
      A48-21 (SGR) - Body ground Y - Body ground Rear height control sensor ground Always Below 1 Ω
      A48-23 (RH-) - Body ground BR - Body ground Leveling motor RH ground Always Below 1 Ω
      A48-24 (LH-) - Body ground LG - Body ground Leveling motor LH ground Always Below 1 Ω

      1. B005Z9DN01

        Waveform 1

        Item Content
        Tester Connection A48-16 (SPDR) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Vehicle is driven at approximately 20 km/h (12 mph)

  3. CHECK HYBRID VEHICLE CONTROL ECU

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

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