LIGHTING SYSTEM > TERMINALS OF ECU

for Preparation Click here



CHECK MAIN BODY ECU AND INSTRUMENT PANEL JUNCTION BLOCK (w/ Daytime Running Light System or w/ Automatic Light Control System)

B210280E01


Text in Illustration 
*1
Instrument Panel Junction Block

B210281E01


Text in Illustration 
*1
Main body ECU (w/ Theft Deterrent System)

B210282E02


Text in Illustration 
*1
Main body ECU (w/o Theft Deterrent System)

  1. Remove the main body ECU.

  2. Measure the resistance and voltage between each terminal of the wire harness side connectors and body ground.

     
    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    3F-11 (GND1) - Body ground
    		-
    		Ground
    		Always
    		Below 1 Ω
    3F-29 (ACC)*1 - Body ground
    		-
    		Ignition power supply (ACC signal)
    		Ignition switch ACC → off
    		11 to 14 V → Below 1 V
    3F-30 (BECU) - Body ground
    		-
    		+B (power system signal system) power supply
    		Always
    		11 to 14 V
    3F-32 (IG)*1 - Body ground
    		-
    		Ignition power supply (IG signal)
    		Ignition switch ON → off
    		11 to 14 V → Below 1 V

    1. *1: w/o Entry and Start System
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reinstall the main body ECU.



  4. Measure the voltage between each terminal of the wire harness side connectors and body ground.

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    D42-1 (RFOG) - Body ground
    		GR - Body ground
    		Rear fog light switch input
    		Rear fog light switch ON
    		Below 1 V
    Rear fog light switch OFF
    		Pulse generation
    D42-3 (HAZ) - Body ground
    		R - Body ground
    		Hazard warning signal switch input
    		Hazard warning signal switch ON
    		Below 1 V
    Hazard warning signal switch OFF
    		Pulse generation
    D42-5 (HU) - Body ground
    		W - Body ground
    		Dimmer switch HIGH signal input
    		Dimmer switch in HIGH
    		Below 1 V
    Dimmer switch in LOW
    		Pulse generation
    D42-8 (HF) - Body ground
    		SB - Body ground
    		Dimmer switch HIGH FLASH signal input
    		Dimmer switch in HIGH FLASH position
    		Below 1 V
    Dimmer switch not in HIGH FLASH position
    		Pulse generation
    D42-13 (CANL) - Body ground
    		W - Body ground
    		CAN communication line L
    		Ignition switch ON
    		Pulse generation
    Ignition switch off
    		Below 1 V
    D42-14 (CANH) - Body ground
    		R - Body ground
    		CAN communication line H
    		Ignition switch ON
    		Pulse generation
    Ignition switch off
    		Below 1 V
    D42-20 (CLTB) - Body ground
    		R - Body ground
    		Automatic light control sensor power supply output
    		Ignition switch ON and light control switch in AUTO
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    D42-21 (CLTS) - Body ground
    		Y - Body ground
    		Automatic light control sensor signal input
    		Automatic light control system operates
    		Pulse generation
    (See waveform 1)
    Ignition switch off
    		Below 1 V
    D42-22 (CLTE) - Body ground
    		GR - Body ground
    		Automatic light control sensor ground
    		Always
    		Below 1 Ω
    D42-27 (FFOG) - Body ground
    		P - Body ground
    		Front fog light switch input
    		Front fog light switch ON
    		Below 1 V
    Front fog light switch OFF
    		Pulse generation
    D42-28 (A) - Body ground
    		GR - Body ground
    		Light control switch AUTO signal input
    		Light control switch in AUTO
    		Below 1 V
    Light control switch not in AUTO
    		Pulse generation
    D42-29 (HEAD) - Body ground
    		L - Body ground
    		Light control switch HEAD signal input
    		Light control switch in HEAD
    		Below 1 V
    Light control switch not in HEAD
    		Pulse generation
    D42-30 (TAIL) - Body ground
    		Y - Body ground
    		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
    3B-25 (DIM) - Body ground
    		G-Y - Body ground
    		High beam headlight relay drive output
    		Dimmer switch in HIGH or HIGH FLASH
    		Below 1 V
    Dimmer switch in LOW
    		11 to 14 V
    3C-29 (FFGO) - Body ground
    		R - Body ground
    		Front fog light 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
    3B-34 (HRLY) - Body ground
    		W-L - Body ground
    		Headlight relay drive output
    		Light control switch in HEAD
    		Below 1 V
    Light control switch not in HEAD
    		11 to 14 V
    If the result is not as specified, the main body ECU may have a malfunction.



      B113714E01

    1. Waveform 1: Using an oscilloscope
      Terminal Name
      		D42-21 (CLTS) - Body ground
      Tester Range
      		5 V/DIV, 5 ms/DIV
      Condition
      		Ignition switch ON and light control switch in AUTO

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