Lighting System Terminals Of Ecu

  1. CHECK HEADLIGHT LEVELING ECU (for HID Headlight)

  1. CHECK AUTOMATIC LIGHT CONTROL SENSOR (w/ Automatic Light Control System)

Lighting System -- Terminals Of Ecu



CHECK HEADLIGHT LEVELING ECU (for HID Headlight)

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Lighting.Lighting System.Lighting System Terminals Of Ecu

  1. Disconnect the H17 headlight leveling 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
    H17-1 (IG) - Body ground
    		R-L - Body ground*1
    B - Body ground*2
    		Ignition power supply
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V
    H17-9 (E1) - Body ground
    		GR - 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 H17 headlight leveling 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
    H17-3 (B2) - H17-9 (E1)
    		P - GR
    		Low beam headlight signal input
    		Low beam headlights on
    		Below 1 V
    Low beam headlights off
    		11 to 14 V
    H17-5 (SPDL) - H17-9 (E1)
    		V - GR
    		Initialization signal input
    		Terminal LVL and terminal CG of DLC3 connected
    		Below 1 V
    Terminal LVL and terminal CG of DLC3 not connected
    		4.5 to 5.5 V
    H17-6 (WNG) - H17-9 (E1)
    		B-L - GR
    		Warning indicator drive output
    		Warning indicator on
    		Below 1 V
    Warning indicator off
    		11 to 14 V
    H17-10 (RH+) - H17-9 (E1)
    		R - GR
    		Leveling motor RH power supply
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V
    H17-11 (LH+) - H17-9 (E1)
    		Y - GR
    		Leveling motor LH power supply
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V
    H17-12 (SBR) - H17-21 (SGR)
    		B - G
    		Rear height control sensor power supply
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		4.75 to 5.25 V
    H17-16 (SPDR) - H17-9 (E1)
    		L - GR
    		Vehicle speed signal input
    		Vehicle is driven at approximately 20 km/h (12 mph)
    		Pulse generation
    (See waveform 1)
    H17-17 (RHE) - H17-9 (E1)
    		LG - GR
    		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
    H17-18 (LHE) - H17-9 (E1)
    		W - GR
    		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
    H17-19 (SHRL) - H17-21 (SGR)
    		L - G
    		Rear height control sensor signal input
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		0.5 to 4.5 V
    H17-21 (SGR) - H17-9 (E1)
    		G - GR
    		Rear height control sensor ground
    		Always
    		Below 1 Ω
    H17-23 (RH-) - H17-9 (E1)
    		B-O - GR
    		Leveling motor RH ground
    		Always
    		Below 1 Ω
    H17-24 (LH-) - H17-9 (E1)
    		GR - GR
    		Leveling motor LH ground
    		Always
    		Below 1 Ω
    1. *1: w/ Automatic Light Control System
    2. *2: w/o Automatic Light Control System
    If the result is not as specified, the headlight leveling ECU may have a malfunction.


      Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Lighting.Lighting System.Lighting System Terminals Of Ecu

    1. Waveform 1

      Item
      		Content
      Terminal No. (Symbol)
      		H17-16 (SPDR) - H17-9 (E1)
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Condition
      		Vehicle is driven at approximately 20 km/h (12 mph)
      HINT:
      As the vehicle speed increases, the wavelength shortens.

CHECK AUTOMATIC LIGHT CONTROL SENSOR (w/ Automatic Light Control System)

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Lighting.Lighting System.Lighting System Terminals Of Ecu

  1. Disconnect the A39 automatic light control sensor 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
    A39-1 (IG) - Body ground
    		R-L - Body ground
    		Ignition power supply
    		Ignition switch off
    		Below 1 V
    Ignition switch ON
    		11 to 14 V
    A39-2 (B) - Body ground
    		L-Y - Body ground
    		Battery power supply
    		Always
    		11 to 14 V
    A39-6 (A) - Body ground
    		P-L - Body ground
    		Ground
    		Headlight dimmer switch in AUTO position
    		Below 1 Ω
    Headlight dimmer switch not in AUTO position
    		10 kΩ or higher
    If the result is not as specified, there may be a malfunction on the wire harness side.

  3. Reconnect the A39 automatic light control sensor connector.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A39-3 (CTY) - Body ground
    		R-B - Body ground
    		Front door courtesy light switch (driver side) signal input
    		Driver side door open
    		Below 1 V
    Driver side door closed
    		11 to 14 V
    A39-5 (H) - Body ground
    		GR - Body ground
    		H-LP RLY relay drive output
    		Ignition switch ON
    Headlight dimmer switch in AUTO position
    Automatic light control sensor covered with a hand
    Low beam headlights come on
    		Below 1 V
    Ignition switch ON
    Headlight dimmer switch in AUTO position
    Automatic light control sensor exposed to ambient light
    Low beam headlights turn off
    		11 to 14 V
    A39-7 (T) - Body ground
    		LG-B - Body ground
    		Taillight relay drive output
    		Ignition switch ON
    Headlight dimmer switch in AUTO position
    Automatic light control sensor covered with a hand
    Taillights come on
    		Below 1 V
    Ignition switch ON
    Headlight dimmer switch in AUTO position
    Automatic light control sensor exposed to ambient light
    Taillights turn off
    		11 to 14 V
    If the result is not as specified, the automatic light control sensor may have a malfunction.