LIGHTING SYSTEM TERMINALS OF ECU

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

    U123621E02
    U123634E02

    1. Disconnect the DB, DE, DF and H80 ECU connectors.

    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

      DH-12 (BECU) - Body ground

      B - Body ground

      Battery power supply

      Always

      11 to 14 V

      DF-5 (ACC) - Body ground

      W - Body ground

      ACC power supply

      Ignition switch ACC

      11 to 14 V

      Ignition switch off

      Below 1 V

      DE-28 (GND1) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

      H80-4 (GND2) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

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

    3. Reconnect the DB, DE, DF and H80 ECU connectors.

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

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      DJ-4 (HU) - DE-28 (GND1)

      P - W-B

      Dimmer switch high signal input

      Dimmer switch in high

      Below 1 V

      Dimmer switch in low

      11 to 14 V

      H79-3 (DRLE) - DE-28 (GND1)*1,*2

      H81-14 (DRLE) - DE-28 (GND1)*1,*3

      W - W-B

      DRL relay drive output

      Daytime running light on

      Below 1 V

      Daytime running light off

      11 to 14 V

      H79-20 (HRLY) - DE-28 (GND1)

      B - W-B

      H-LP relay drive output

      Light control switch in head

      Below 1 V

      Light control switch not in head

      11 to 14 V

      H79-21 (TAIL) - DE-28 (GND1)

      W - W-B

      Light control switch tail signal input

      Light control switch in tail or head

      Below 1 V

      Light control switch in neither tail nor head

      11 to 14 V

      H79-22 (HF) - DE-28 (GND1)

      R - W-B

      Dimmer switch high flash signal input

      Dimmer switch in high flash position

      Below 1 V

      Dimmer switch not in high flash position

      11 to 14 V

      H80-11 (RFGO) - DE-28 (GND1)

      GR - W-B

      Rear fog light relay drive output

      Light control switch in head and rear fog light switch on

      Below 1 V

      Light control switch in head and rear fog light switch off

      11 to 14 V

      H80-12 (DIM) - DE-28 (GND1)

      LG - W-B

      Dimmer relay drive output

      Dimmer switch in high or high flash

      Below 1 V

      Dimmer switch not in high or high flash

      11 to 14 V

      H80-14 (CLTE) - H80-16 (CLTB)*4, *6

      W - P

      Automatic light control sensor power supply output

      Ignition switch off

      Below 1 V

      Ignition switch ON and headlight dimmer switch in AUTO position

      11 to 14 V

      H80-15 (CLTS) - DE-28 (GND1)*4

      G - W-B*6

      V - W-B*7

      Automatic light control sensor signal input

      Ignition switch off

      Below 1 V

      Automatic light control system operates

      Pulse generation

      (See waveform 1)

      H81-9 (RFOG) - DE-28 (GND1)

      SB - W-B

      Rear fog light switch input

      Rear fog light switch on

      Below 1 V

      Rear fog light switch off

      11 to 14 V

      H81-12 (HEAD) - DE-28 (GND1)

      L - W-B

      Light control switch head signal input

      Light control switch in head

      Below 1 V

      Light control switch not in head

      11 to 14 V

      H81-13 (FFOG) - DE-28 (GND1)*5

      B - W-B

      Front fog light switch input

      Front fog light switch on

      Below 1 V

      Front fog light switch off

      11 to 14 V

      H81-17 (FFGO) - DE-28 (GND1)*5

      R - W-B

      Front fog light relay drive output

      Light control switch in tail and front fog light switch on

      Below 1 V

      Front fog light switch off

      11 to 14 V

      H81-18 (A) - DE-28 (GND1)*4

      V - W-B

      Light control switch AUTO signal input

      Light control switch in AUTO

      Below 1 V

      Light control switch not in AUTO

      11 to 14 V

      DG-1 (TRLY) - DE-28 (GND1)

      W - W-B

      Battery power supply

      Always

      11 to 14 V

      DC-5 (PKB) - DE-28 (GND1)*1

      P - W-B

      Parking brake switch input

      Parking brake switch on

      Below 1 V

      Parking brake switch off

      11 to 14 V

      DB-33 (TRLY) - DE-28 (GND1)

      GR - W-B

      Clearance light LH signal output

      Light control switch in tail position

      11 to 14 V

      Light control switch not in tail position

      Below 1 V

      DB-15 (TRLY) - DE-28 (GND1)

      G - W-B

      Clearance light RH signal output

      Light control switch in tail position

      11 to 14 V

      Light control switch not in tail position

      Below 1 V

      DA-29 (TRLY) - DE-28 (GND1)

      G - W-B

      Taillight signal output

      Light control switch in tail position

      11 to 14 V

      Light control switch not in tail position

      Below 1 V

      DS-17 (HAZ) - DE-28 (GND1)

      B - W-B

      Hazard warning signal switch input

      Hazard warning signal switch on

      Below 1 V

      Hazard warning signal switch off

      11 to 14 V

      • *1: w/ Daytime Running Light

      • *2: for LHD

      • *3: for RHD

      • *4: w/ Automatic Light Control System

      • *5: w/ Front Fog Light

      • *6: w/o Rain Sensor

      • *7: w/ Rain Sensor

      1. B113714E01

        Waveform 1

        Item

        Content

        Terminal No. (Symbol)

        H80-15 (CLTS) - DE-28 (GND1)

        Tool setting

        5 V/DIV., 5 ms./DIV.

        Condition

        Ignition switch ON

        Headlight dimmer switch AUTO

        • w/ Rain sensor

          • Rain sensor covered with a hand → Rain sensor exposed to ambient light

        • w/o Rain sensor

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

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

  2. CHECK HEADLIGHT LEVELING ECU (for HID Headlight)

    U123619E02

    1. Disconnect the A49 ECU 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

      A49-1 (IG) - Body ground

      G - Body ground

      Ignition power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A49-9 (E1) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

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

    3. Reconnect the A49 ECU 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

      A49-3 (B2) - A49-9 (E1)

      B - W-B

      Low beam headlight signal input

      Low beam headlights on

      Below 1 V

      Low beam headlights off

      11 to 14 V

      A49-5 (PRST) - A49-9 (E1)

      GR - 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

      Approximately 5 V

      A49-6 (WNG) - A49-9 (E1)

      GR - W-B

      Warning indicator drive output

      Warning indicator on

      11 to 14 V

      Warning indicator off

      Below 1 V

      A49-10 (RHT) - A49-9 (E1)

      LG - W-B

      Leveling motor RH power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A49-11 (LHT) - A49-9 (E1)

      W - W-B

      Leveling motor LH power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      11 to 14 V

      A49-12 (SBR) - A49-21 (SGR)

      R - BR

      Rear height control sensor power supply

      Ignition switch off

      Below 1 V

      Ignition switch ON

      4.75 to 5.25 V

      A49-16 (SPDR) - A49-9 (E1)

      V - W-B

      Vehicle speed signal input

      Vehicle is driven at approximately 20 km/h (12 mph)

      Pulse generation

      (See waveform 1)

      A49-17 (RH+) - A49-9 (E1)

      P - 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

      A49-18 (LH+) - A49-9 (E1)

      BR-W - 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

      A49-19 (SHRL) - A49-21 (SGR)

      Y - BR

      Rear height control sensor signal input

      Ignition switch off

      Below 1 V

      Ignition switch ON

      0.5 to 4.5 V

      A49-21 (SGR) - A49-9 (E1)

      BR - W-B

      Rear height control sensor ground

      Always

      Below 1 Ω

      A49-23 (RH-) - A49-9 (E1)

      W-B - W-B

      Leveling motor RH ground

      Always

      Below 1 Ω

      A49-24 (LH-) - A49-9 (E1)

      B - W-B

      Leveling motor LH ground

      Always

      Below 1 Ω
      1. E354469E01

        Waveform 1

        Item

        Content

        Terminal No. (Symbol)

        A49-16 (SPDR) - A49-9 (E1)

        Tool setting

        5 V/DIV., 20 ms./DIV.

        Condition

        Vehicle is driven at approximately 20 km/h (12 mph)
        Tip:

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.