LIGHTING SYSTEM TERMINALS OF ECU


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

    A004S4SE02
    A004O4XE02

    1. Disconnect the DB, DE and D80 main 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
      DB-30 (BECU) - Body ground W - Body ground Battery power supply Always 11 to 14 V
      DE-17 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      D80-4 (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 and D80 main body 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
      D79-20 (HRLY) -DE-17 (GND1) B - W-B H-LP relay drive output Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      DG-1 (TRLY) -DE-17 (GND1) W - W-B Taillight relay drive output Light control switch in tail position Below 1 V
      Light control switch not in tail position 11 to 14 V
      DB-33 (TRLY) - DE-17 (GND1) LG - W-B Front parking 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-17 (GND1) G - W-B Front parking 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-17 (GND1) G - W-B Rear taillight signal output Light control switch in tail position 11 to 14 V
      Light control switch not in tail position Below 1 V
      D80-12 (DIM) - DE-17 (GND1) LG - W-B Dimmer relay drive output Dimmer switch in high or high flash position Below 1 V
      Dimmer switch not in high or high flash position 11 to 14 V
      D79-21 (TAIL) - DE-17 (GND1) W - W-B Light control switch tail position signal input Light control switch in tail or head position Below 1 V
      Light control switch in neither tail nor head position 11 to 14 V
      D81-12 (HEAD) - DE-17 (GND1) L - W-B 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
      DJ-4 (HU) - DE-17 (GND1) P - W-B Dimmer switch high position signal input Dimmer switch in high or high flash position Below 1 V
      Dimmer switch in low position 11 to 14 V
      D79-22 (HF) - DE-17 (GND1) R - W-B 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
      D81-13 (FFOG) - DE-17 (GND1)*6 P - W-B Front fog light switch input Front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      D81-9 (RFOG) - DE-17 (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
      D81-18 (A) - DE-17 (GND1)*3 V - W-B 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
      D81-17 (FFGO) - DE-17 (GND1)*6 G - W-B Front fog light relay drive output Light control switch in head position and front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      D80-11 (RFGO) - DE-17 (GND1) GR - W-B Rear fog light relay drive output Light control switch in head position and rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      DS-17 (HAZ) - DE-17 (GND1) GR - W-B Hazard warning signal switch input Hazard warning signal switch on Below 1 V
      Hazard warning signal switch off 11 to 14 V
      D80-15 (CLTS) - DE-17 (GND1)*3 V - W-B Rain sensor (automatic light control) signal input Ignition switch off Below 1 V
      Automatic light control system operates

      Pulse generation

      (See waveform 1)
      D79-8 (LCTY) - DE-17 (GND1) SB - W-B

      Courtesy switch input

      (Rear left door circuit)

      		 Rear door LH open Below 1 V
      Rear door LH closed 11 to 14 V

      DA-21 (DCTY) - DE-17 (GND1)*1

      DC-6 (DCTY) - DE-17 (GND1)*2

      W - W-B

      SB - W-B

      Courtesy switch input

      (Driver side door circuit)

      		 Driver side door open Below 1 V
      Driver side door closed 11 to 14 V
      DE-19 (RCTY) - DE-17 (GND1) LG - W-B

      Courtesy switch input

      (Rear right door circuit)

      		 Rear door RH open Below 1 V
      Rear door RH closed 11 to 14 V

      DE-20 (PCTY) - DE-17 (GND1)*1

      DA-24 (PCTY) - DE-17 (GND1)*2

      Y - W-B

      W - W-B

      Courtesy switch input

      (Front passenger side door circuit)

      		 Front passenger side door open Below 1 V
      Front passenger side door closed 11 to 14 V
      DA-7 (BCTY) - DE-17 (GND1) LG - W-B

      Courtesy switch input

      (Luggage compartment door*4)

      (Back door*5)

      		 Back door open Below 1 V
      Back door closed 11 to 14 V
      D79-25 (LSWD) - DE-17 (GND1) GR - W-B Driver side door unlock detection switch input Driver side door locked Below 1 V
      Driver side door unlocked 11 to 14 V

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Automatic Light Control System

      • *4: for Sedan

      • *5: for Wagon

      • *6: w/ Front Fog Light

      • If the result is not as specified, the main body ECU (instrument junction block assembly) may have a malfunction.


      1. A004QFKE02

        Waveform 1

        Item Content
        Terminal No. (Symbol) D80-15 (CLTS) - DE-17 (GND1)
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition

        Ignition switch ON

        Headlight dimmer switch AUTO

        Cover the rain sensor with a hand → Expose the rain sensor to the ambient light

        Tech Tips

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

  2. CHECK HEADLIGHT SWIVEL ECU ASSEMBLY

    A004QPOE02

    1. Disconnect the A38 headlight swivel 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
      A38-14 (IGS) - Body ground P - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A38-15 (IG) - Body ground SB - Body ground Ignition power supply Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      A38-22 (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 A38 headlight swivel ECU connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A38-1 (SMBL) - A38-22 (E1) W - W-B Swivel motor LH power output Ignition switch ON 11 to 14 V
      A38-2 (SMBR) - A38-22 (E1) GR - W-B Swivel motor RH power output Ignition switch ON 11 to 14 V
      A38-3 (LL1+) - A38-22 (E1) G - W-B Headlight leveling motor LH power output Ignition switch ON 11 to 14 V
      A38-4 (LR1+) - A38-22 (E1) L - W-B Headlight leveling motor RH power output Ignition switch ON 11 to 14 V
      A38-6 (NSW)*1 - A38-22 (E1) V - W-B Neutral position switch signal input

      Ignition switch ON

      Shift lever in R

      		 11 to 14 V
      A38-7 (RSW)*1 - A38-22 (E1) R - W-B Back-up light switch signal input

      Ignition switch ON

      Shift lever in R

      		 11 to 14 V
      A38-7 (RSW)*2 - A38-22 (E1) R - W-B Park/neutral position switch signal input

      Ignition switch ON

      Shift lever in R

      		 11 to 14 V
      A38-10 (SMR) - A38-22 (E1) R - W-B Swivel motor RH Ignition switch ON Pulse generation
      A38-11 (RHT) - A38-22 (E1) P - W-B Headlight leveling motor RH Ignition switch ON Pulse generation
      A38-17 (INIT) - A38-22 (E1) V - W-B Vehicle height signal Ignition switch ON (no passengers, no luggage, vehicle not moving) 2.5 V
      A38-18 (B) - A38-22 (E1) Y - W-B Vehicle height signal Ignition switch ON 5 V
      A38-19 (SHRL) - A38-22 (E1) GR - W-B Vehicle height signal Ignition switch ON (no passengers, no luggage, vehicle not moving) 2.5 V
      A38-21 (SGF) - A38-22 (E1) B - W-B Vehicle height signal Always Below 1 Ω
      A38-23 (SMGL) - A38-22 (E1) Y - W-B Swivel motor LH Always Below 1 Ω
      A38-24 (SMGR) - A38-22 (E1) LG - W-B Swivel motor RH Always Below 1 Ω
      A38-27 (LL1-) - A38-22 (E1) LG - W-B Headlight leveling motor LH Always Below 1 Ω
      A38-28 (LR1-) - A38-22 (E1) B - W-B Headlight leveling motor RH Always Below 1 Ω
      A38-29 (SML) - A38-22 (E1) Y-B - W-B Swivel motor LH Ignition switch ON Pulse generation
      A38-30 (LHT) - A38-22 (E1) B - W-B Headlight leveling motor LH Ignition switch ON Pulse generation
      A38-32 (MSW) - A38-22 (E1) V - W-B Headlight swivel main switch signal input

      Ignition switch ON

      Headlight swivel main switch on

      		 Below 1 V

      Ignition switch ON

      Headlight swivel main switch off

      		 11 to 14 V
      A38-12 (CANH) - A38-22 (E1) Y - W-B CAN communication Ignition switch ON Pulse generation
      A38-13 (CANL) - A38-22 (E1) W - W-B CAN communication Ignition switch ON Pulse generation

      • *1: for Manual Transaxle

      • *2: for Automatic Transaxle


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