LIGHTING SYSTEM > TERMINALS OF ECU

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CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

E187247E21

  1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    2B-25 - Body ground
    		B - Body ground
    		IG power supply
    		Power switch on (IG)
    		11 to 14 V
    Power switch off
    		Below 1 V
    2C-18 (BECU) - Body ground
    		B - Body ground
    		Auxiliary battery power supply
    		Power switch off
    		11 to 14 V
    2E-1*1 - Body ground
    2F-1*2 - Body ground
    		W - Body ground
    		Auxiliary battery power supply
    		Power switch off
    		11 to 14 V

    1. *1: for LHD
    2. *2: for RHD
    If the result is not as specified, there may be a malfunction in the wire harness.

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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    2B-6 (GND1) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    H17-3 (GND2) - Body ground
    		W-B - Body ground
    		Ground
    		Always
    		Below 1 Ω
    If the result is not as specified, there may be a malfunction in the wire harness.

  4. Reconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.



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

    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    2C-20 (PKB) - Body ground
    		R - Body ground
    		Parking brake switch input
    		Parking brake switch on
    		Below 1 V
    Parking brake switch off
    		11 to 14 V
    2C-32 (HRLY) - Body ground
    		G - Body ground
    		Headlight relay drive output
    		Light control switch in head position
    		Below 1 V
    Light control switch not in head position
    		11 to 14 V
    H16-15 (DRL)*1 - Body ground
    		Y - Body ground
    		Daytime running light system drive output
    		Daytime running light system operates
    		Below 1 V
    Daytime running light system not operates
    		11 to 14 V
    H17-2 (LSWR) - Body ground
    		GR - Body ground
    		Rear door unlock detection switch RH input
    		Rear door RH locked
    		Pulse generation
    Rear door RH unlocked
    		Below 1 V
    2C-22 (DIM) - Body ground
    		Y - Body ground
    		High beam headlights drive output
    		Dimmer switch in high or high flash position
    		Below 1 V
    Dimmer switch in low position
    		11 to 14 V
    H16-8 (HF) - Body ground
    		LG - Body ground
    		Dimmer switch high flash position signal input
    		Dimmer switch in high flash position
    		Below 1 V
    Dimmer switch not in high flash position
    		Pulse generation
    H16-20 (CLTB) - Body ground
    		R - Body ground
    		Automatic light control sensor power supply output
    		Power switch off
    		Below 1 V
    Power switch on (IG) and light control switch in AUTO position
    		11 to 14 V
    H16-21 (CLTS) - Body ground
    		W - Body ground
    		Automatic light control sensor signal input
    		Power switch off
    		Below 1 V
    Automatic light control system operates
    		Pulse generation
    (See waveform 1)
    H16-27 (FFOG) - Body ground
    		LG - Body ground
    		Front fog light switch input
    		Front fog light switch on
    		Below 1 V
    Front fog light switch off
    		Pulse generation
    H16-28 (A) - Body ground
    		W - Body ground
    		Light control switch AUTO position signal input
    		Light control switch in AUTO position
    		Below 1 V
    Light control switch not in AUTO position
    		Pulse generation
    H16-29 (HEAD) - Body ground
    		L - Body ground
    		Light control switch head position input
    		Light control switch in head position
    		Below 1 V
    Light control switch not in head position and power switch off
    		Pulse generation
    Light control switch not in head position and power switch on (IG)
    		11 to 14 V
    H16-30 (TAIL) - Body ground
    		Y - Body ground
    		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, and power switch off
    		Pulse generation
    Light control switch in neither tail nor head position, and power switch on (IG)
    		11 to 14 V

    HINT:
    *1: w/ Daytime Running Light System

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



      B113714E01

    1. Waveform 1
      Item
      		Content
      Tool setting
      		5 V/DIV., 5 ms./DIV.

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


CHECK POWER MANAGEMENT CONTROL ECU

C146689E34

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

    Terminal No.
    (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A19-15 (BL) - H3-6 (E1)
    		LG - W-B
    		Back up light
    		Power switch on (IG), reverse (R) selected
    		11 to 14 V
    If the result is not as specified, the headlight leveling ECU assembly may have a malfunction.


CHECK HEADLIGHT LEVELING ECU ASSEMBLY


  1. Disconnect the A46 headlight leveling ECU assembly connector.


    E101528E18

  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
    A46-1 (IG) - Body ground
    		LG - Body ground
    		IG power supply
    		Power switch off
    		Below 1 V
    Power switch on (IG)
    		11 to 14 V

    Standard Resistance 
    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A46-9 (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 A46 headlight leveling ECU assembly connector.



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

    Standard Resistance 
    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A46-21 (SGR) - Body ground
    		Y - Body ground
    		Rear height control sensor ground
    		Always
    		Below 1 Ω
    A46-23 (RH-) - Body ground
    		BR - Body ground
    		Leveling motor RH ground
    		Always
    		Below 1 Ω
    A46-24 (LH-) - Body ground
    		LG - Body ground
    		Leveling motor LH ground
    		Always
    		Below 1 Ω

    Standard Voltage 
    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    A46-3 (HDLP) - Body ground
    		V - Body ground
    		Low beam headlight signal input
    		Low beam headlights on
    		Below 1.5 V
    Low beam headlights off
    		Above 5 V
    A46-5 (INIT) - Body ground
    		B - Body ground
    		Initialization signal input
    		Terminals LVL and GND of DLC3 connected
    		Below 1 V
    Terminals LVL and GND of DLC3 not connected
    		Approx. 5 V
    A46-6 (WNG) - Body ground
    		L - Body ground
    		Warning indicator drive output
    		Warning indicator on
    		Below 1 V
    Warning indicator off
    		11 to 14 V
    A46-10 (RH+) - Body ground
    		W - Body ground
    		Leveling motor RH power supply
    		Power switch off
    		Below 1 V
    Power switch on (IG)
    		11 to 14 V
    A46-11 (LH+) - Body ground
    		R - Body ground
    		Leveling motor LH power supply
    		Power switch off
    		Below 1 V
    Power switch on (IG)
    		11 to 14 V
    A46-12 (SBR) - Body ground
    		P - Body ground
    		Rear height control sensor power supply
    		Power switch off
    		Below 1 V
    Power switch on (IG)
    		4.75 to 5.25 V
    A46-16 (SPDR) - Body ground
    		V - Body ground
    		Vehicle speed signal input
    		Vehicle is driven at approx. 20 km/h (12mph)
    		Pulse generation
    (See waveform 1)
    A46-17 (RHT) - Body ground
    		B - Body ground
    		Leveling motor RH operation signal input
    		With low beam headlights on, vehicle height not changed
    		Below 1 V
    With low beam headlights on, change vehicle height and keep for more than 3 seconds
    		1.0 to 14.4 V
    A46-18 (LHT) - Body ground
    		G - Body ground
    		Leveling motor LH operation signal input
    		With low beam headlights on, vehicle height not changed
    		Below 1 V
    With low beam headlights on, change vehicle height and keep for more than 3 seconds
    		1.0 to 14.4 V
    A46-19 (SHRL) - Body ground
    		SB - Body ground
    		Rear height control sensor signal input
    		Power switch off
    		Below 1 V
    Power switch on (IG)
    		0.5 to 4.5 V
    If the result is not as specified, the headlight leveling ECU assembly may have a malfunction.



      E149152E01

    1. Waveform 1
      Item
      		Content
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Vehicle condition
      		Driving at approx. 20 km/h (12 mph)


CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (LH SIDE)

B209687E30

  1. Disconnect the K7 connector.

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

    HINT:
    Measure the values on the wire harness side with the connector disconnected.


    Standard Voltage 
    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    K7-14 (BDR) - Body ground
    		L - Body ground
    		+B power supply
    		Power switch off
    		11 to 14 V
    K7-6 (CPUB) - Body ground
    		LG - Body ground
    		+B power supply
    		Power switch off
    		11 to 14 V
    K7-5 (SIG) - Body ground
    		Y - Body ground
    		Ignition power supply
    		Power switch off → on (IG)
    		0 V → 11 to 14 V
    If the result is not as specified, there may be a malfunction on the wire harness side.

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

    HINT:
    Measure the values on the wire harness side with the connector disconnected.


    Standard Resistance 
    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    K7-7 (GND) - 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.

  4. Reconnect the K7 connector.

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

    Standard Voltage 
    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    z6-1 (LMVR) - z6-9 (LMHR)
    		W - R
    		Vertical mirror motor drive voltage
    		LH mirror surface moving upward → stopped
    		11 to 14 V → 0 V


CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (RH SIDE)

B209687E31

  1. Disconnect the J8 connector.

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

    HINT:
    Measure the values on the wire harness side with the connector disconnected.


    Standard Voltage 
    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    J8-6 (CPUB) - Body ground
    		LG - Body ground
    		+B power supply
    		Power switch off
    		11 to 14 V
    J8-14 (BDR) - Body ground
    		L - Body ground
    		+B power supply
    		Power switch off
    		11 to 14 V
    J8-5 (SIG) - Body ground
    		Y - Body ground
    		Ignition power supply
    		Power switch off → on (IG)
    		0 V → 11 to 14 V
    If the result is not as specified, there may be a malfunction on the wire harness side.

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

    HINT:
    Measure the values on the wire harness side with the connector disconnected.


    Standard Resistance 
    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    J8-7 (GND) - 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.

  4. Reconnect the J8 connector.

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

    Standard Voltage 
    Tester Connection
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    z7-1 (RMVR) - z7-9 (RMHR)
    		W - R
    		Vertical mirror motor drive voltage
    		RH mirror surface moving upward → stopped
    		11 to 14 V → 0 V