LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (w/o Theft Deterrent System)

    A005LXHE02
    Text in Illustration
    *A for LHD *B for RHD
    *1 Instrument Panel Junction Block Assembly *2 Main Body ECU (Multiplex Network Body ECU)

    1. Disconnect the 3A, 3B, 3C and 3E*1 or 3F*2 instrument panel junction block assembly connectors.


      • *1: for LHD

      • *2: for RHD

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

      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3E-1*1 - Body ground Body ground B - Body ground Battery power supply Always 11 to 14 V
      3F-1*2 - Body ground - Body ground B - Body ground Battery power supply Always 11 to 14 V

      • *1: for LHD

      • *2: for RHD

      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3B-8 - Body ground W-B - Body ground Ground Always Below 1 Ω

      Tech Tips

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the 3A, 3B, 3C and 3E*1 or 3F*2 instrument panel junction block assembly connectors.


      • *1: for LHD

      • *2: for RHD

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F76-22 (CLTE)* - Body ground G - Body ground Automatic light control sensor ground Always Below 1 Ω

      • *: w/ Automatic Light Control System

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F76-1 (RFOG)*1 - Body ground LG - Body ground Rear fog light switch signal Rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      F76-5 (HU)*2 - Body ground P - Body ground Dimmer switch high signal Dimmer switch in high position Below 1 V
      Dimmer switch in low position 11 to 14 V
      F76-8 (HF)*2 - Body ground P - Body ground Dimmer switch high flash signal Dimmer switch in high flash position Below 1 V
      Dimmer switch not in high flash position 11 to 14 V
      F76-15 (DRLE)*1 - Body ground L - Body ground Daytime running light system drive output Daytime running light system operating Below 1 V
      Daytime running light system not operating 11 to 14 V
      F76-20 (CLTB)*3 - Body ground W - Body ground Automatic light control sensor power supply Ignition switch ON 11 to 14 V
      F76-21 (CLTS)*3 - Body ground B - Body ground Automatic light control sensor signal Ignition switch off Below 1 V
      Automatic light control system operates

      Pulse generation

      (See waveform 1)
      F76-27 (FFOG)*4 - Body ground G - Body ground Front fog light switch signal Front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      F76-28 (A)*3 - Body ground V - Body ground Light control switch AUTO signal Light control switch in AUTO position Below 1 V
      Light control switch not in AUTO position 11 to 14 V*5
      Pulse generation*1
      F76-29 (HEAD)*2 - Body ground L - Body ground Light control switch head signal Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      F76-30 (TAIL)*2 - Body ground) SB - Body ground Light control switch tail signal Light control switch in tail or head position Below 1 V
      Light control switch in neither tail nor head position 11 to 14 V
      3A-15*4 - Body ground P - Body ground Front fog relay drive output Light control switch in tail and front fog light switch on Below 1 V
      Light control switch in tail and front fog light switch off 11 to 14 V
      3A-28*1 - Body ground R - Body ground Parking brake switch signal Parking brake applied Below 1 V
      Parking brake released 11 to 14 V
      3C-18 (HRLY)*2 - Body ground V - Body ground Headlight relay drive output Light control switch in head Below 1 V
      Light control switch not in head 11 to 14 V
      3C-35 (DIM)*2 - Body ground P - Body ground Dimmer relay drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V

      • *1: w/ Rear Fog Light

      • *2: w/ Rear Fog Light or w/ Automatic Light Control System

      • *3: w/ Automatic Light Control System

      • *4: w/ Front Fog Light

      • *5: w/o Rear Fog Light

      Tech Tips

      If the result is not as specified, the main body ECU (multiplex network body ECU) may have a malfunction.


      1. A005JE8E01

        Waveform 1

        Item Content
        Terminal No. (Symbol) F76-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition

        Ignition switch ON

        Headlight dimmer switch AUTO

        Automatic light control sensor covered with a hand → Automatic light control sensor exposed to ambient light

        Tech Tips

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

  2. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (w/ Theft Deterrent System)

    A005JAJE02
    Text in Illustration
    *1 Instrument Panel Junction Block Assembly *2 Main Body ECU (Multiplex Network Body ECU)

    1. Disconnect the 3A, 3B, 3C and 3F instrument panel junction block assembly connectors.

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

      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3F-1 - Body ground - Body ground B - Body ground Battery power supply Always 11 to 14 V
      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      3B-8 - Body ground W-B - Body ground Ground Always Below 1 Ω

      Tech Tips

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Reconnect the 3A, 3B, 3C and 3F instrument panel junction block assembly connectors.

    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F76-22 (CLTE)* - Body ground G - Body ground Automatic light control sensor ground Always Below 1 Ω

      • *: w/ Automatic Light Control System

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F76-1 (RFOG) - Body ground LG - Body ground Rear fog light switch signal Rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      F76-5 (HU) - Body ground P - Body ground Dimmer switch high signal Dimmer switch in high position Below 1 V
      Dimmer switch in low position 11 to 14 V
      F76-8 (HF) - Body ground P - Body ground Dimmer switch high flash signal Dimmer switch in high flash position Below 1 V
      Dimmer switch not in high flash position 11 to 14 V
      F76-15 (DRLE) - Body ground L - Body ground Daytime running light system drive output Daytime running light system operating Below 1 V
      Daytime running light system not operating 11 to 14 V
      F76-20 (CLTB)*1 - Body ground W - Body ground Automatic light control sensor power supply Ignition switch ON 11 to 14 V
      F76-21 (CLTS)*1 - Body ground B - Body ground Automatic light control sensor signal Ignition switch off Below 1 V
      Automatic light control system operates

      Pulse generation

      (See waveform 1)
      F76-27 (FFOG)*2 - Body ground G - Body ground Front fog light switch signal Front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      F76-28 (A)*1 - Body ground V - Body ground Light control switch AUTO signal Light control switch in AUTO position Below 1 V
      Light control switch not in AUTO position Pulse generation
      F76-29 (HEAD) - Body ground L - Body ground Light control switch head signal Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      F76-30 (TAIL) - Body ground) SB - Body ground Light control switch tail signal Light control switch in tail or head position Below 1 V
      Light control switch in neither tail nor head position 11 to 14 V
      3A-15*2 - Body ground P - Body ground Front fog relay drive output Light control switch in tail and front fog light switch on Below 1 V
      Light control switch in tail and front fog light switch off 11 to 14 V
      3A-28 - Body ground R - Body ground Parking brake switch signal Parking brake applied Below 1 V
      Parking brake released 11 to 14 V
      3C-18 (HRLY) - Body ground V - Body ground Headlight relay drive output Light control switch in head Below 1 V
      Light control switch not in head 11 to 14 V
      3C-35 (DIM) - Body ground P - Body ground Dimmer relay drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V

      • *1: w/ Automatic Light Control System

      • *2: w/ Front Fog Light

      Tech Tips

      If the result is not as specified, the main body ECU (multiplex network body ECU) may have a malfunction.


      1. A005JE8E01

        Waveform 1

        Item Content
        Terminal No. (Symbol) F76-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition

        Ignition switch ON

        Headlight dimmer switch AUTO

        Automatic light control sensor covered with a hand → Automatic light control sensor exposed to ambient light

        Tech Tips

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

  3. CHECK HEADLIGHT LEVELING ECU ASSEMBLY (w/ HID Headlight)

    A005H94E02

    1. Disconnect the A43 headlight leveling ECU assembly connector.

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

      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A43-1 (IG) - Body ground V - Body ground Ignition power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A43-9 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω

      Tech Tips

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the A43 headlight leveling ECU assembly connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A43-3 (HDLP) - A43-9 (E1) BE - W-B Low beam headlight signal input Low beam headlights on Below 1.5 V
      Low beam headlights off Above 5 V
      A43-5 (INIT) - A43-9 (E1) G - W-B Initialization signal input Terminal LVL and terminal GND of DLC3 connected Below 1 V
      Terminal LVL and terminal GND of DLC3 not connected Approx. 5 V
      A43-6 (WNG) - A43-9 (E1) SB - W-B Warning indicator drive output Warning indicator on Below 1 V
      Warning indicator off 11 to 14 V
      A43-10 (RH+) - A43-9 (E1) R - W-B Leveling motor RH power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A43-11 (LH+) - A43-9 (E1) G - W-B Leveling motor LH power supply Ignition switch off Below 1 V
      Ignition switch ON 11 to 14 V
      A43-12 (SBR) - A43-21 (SGR) P - R Rear height control sensor power supply Ignition switch off Below 1 V
      Ignition switch ON 4.75 to 5.25 V
      A43-16 (SPDR) - A43-9 (E1) GR - W-B Vehicle speed signal input Vehicle is driven at approx. 20 km/h (12 mph)

      Pulse generation

      (See waveform 1)
      A43-17 (RHT) - A43-9 (E1) G - W-B Leveling motor RH operation signal input With low beam headlights on, vehicle height not changed Below 1 V
      With low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14.4 V
      A43-18 (LHT) - A43-9 (E1) R - W-B Leveling motor LH operation signal input With low beam headlights on, vehicle height not changed Below 1 V
      With low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14.4 V
      A43-19 (SHRL) - A43-21 (SGR) G - R Rear height control sensor signal input Ignition switch off Below 1 V
      Ignition switch ON 0.5 to 4.5 V
      A43-21 (SGR) - A43-9 (E1) R - W-B Rear height control sensor ground Always Below 1 Ω
      A43-23 (RH-) - A43-9 (E1) L - W-B Leveling motor RH ground Always Below 1 Ω
      A43-24 (LH-) - A43-9 (E1) L - W-B Leveling motor LH ground Always Below 1 Ω

      Tech Tips

      If the result is not as specified, the ECU may have a malfunction.


      1. A005JK3

        Waveform 1

        Item Content
        Terminal No. (Symbol) A43-16 (SPDR) - A43-9 (E1)
        Tool setting 2 V/DIV., 2 ms./DIV.
        Condition Vehicle is driven at approx. 20 km/h (12 mph)

  4. CHECK COMBINATION METER ASSEMBLY

    A005GJCE01

    1. Disconnect the F1 and F3 combination meter assembly connectors.

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

      Standard Voltage
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F3-1 (B) - Body ground R - Body ground Battery power supply Always 11 to 14 V
      Standard Resistance
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F1-21 (ET) - Body ground W-B - Body ground Ground Always Below 1 Ω

      Tech Tips

      If the result is not as specified, there may be a malfunction on the wire harness side.

    3. Reconnect the F1 and F3 combination meter assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      F3-3 (HAZ) - Body ground L - Body ground Hazard warning signal switch signal Hazard warning signal switch off 11 to 14 V
      Hazard warning signal switch on Below 1 Ω
      F3-7 (LR) - Body ground V - Body ground Turn signal light RH drive output Turn signal light RH turned on 11 to 14 V
      Turn signal light RH turned off Below 1 Ω
      F3-9 (ER) - Body ground B - Body ground Turn signal switch RH signal Turn signal switch RH on Below 1 Ω
      Turn signal switch RH off 11 to 14 V
      F3-10 (EL) - Body ground Y - Body ground Turn signal switch LH signal Turn signal switch LH on Below 1 Ω
      Turn signal switch LH off 11 to 14 V
      F3-13 (LL) - Body ground LG - Body ground Turn signal light LH drive output Turn signal light LH turned on 11 to 14 V
      Turn signal light LH turned off Below 1 Ω

      Tech Tips

      If the result is not as specified, the ECU may have a malfunction.