LIGHTING SYSTEM TERMINALS OF ECU


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

    B004WC0C03
    *1 Main Body ECU (Multiplex Network Body ECU) - -

    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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    2. Connect the instrument panel junction block assembly connectors.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-32 (IG) - Body ground None - Body ground Ignition power supply Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      A-31 (BECU) - Body ground None - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      A-30 (ACC) - Body ground None - Body ground ACC power supply Power switch on (ACC) 11 to 14 V
      Power switch off Below 1 V
      A-11 (GND1) - Body ground None - Body ground Ground Always Below 1 Ω

    3. Install the main body ECU (multiplex network body ECU).

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G12-12 (HRY2) - Body ground V - Body ground Headlight ECU sub-assembly LH power supply Power switch on (IG) Below 1.5 V
      Power switch off 6 to 14 V
      5F-19 (HRLY) - Body ground*1 B - Body ground Headlight ECU sub-assembly RH power supply Power switch on (IG) Below 1.5 V
      Power switch off 6 to 14 V
      5F-20 (HRLY) - Body ground*2 B - Body ground Headlight ECU sub-assembly RH power supply Power switch on (IG) Below 1.5 V
      Power switch off 6 V or higher
      G12-23 (CLTB) - G12-25 (CLTE) V - G Automatic light control sensor power supply output Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      G12-24 (CLTS) - Body ground GR - Body ground Automatic light control sensor signal input Power switch off Below 1 V
      Power switch on (IG), material which blocks light used to cover and then uncover top of automatic light control sensor

      Pulse generation

      (See waveform 1)
      G12-16 (HEAD) - Body ground SB - Body ground Light control switch in HEAD position signal input Light control switch in HEAD position Below 1 V
      Light control switch not in HEAD position 11 to 14 V
      G17-2 (OHIL) - Body ground LG - Body ground Door outside handle sub-assembly (outside handle lights) signal output Door outside handle sub-assembly (outside handle lights) off Below 1 V
      Door outside handle sub-assembly (outside handle lights) on 11 to 14 V

      *1: for LHD

      *2: for RHD

    5. B004RGME04

      Waveform 1

      Item Content
      Terminal No. (Symbol) G12-24 (CLTS) - Body ground
      Tool Setting 2 V/DIV., 10 ms./DIV.
      Condition Power switch on (IG), material which blocks light used to cover and then uncover top of automatic light control sensor

      Tech Tips

      The communication waveform changes according to the surrounding brightness.

  2. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH

    B004R8BN38

    1. Disconnect the A31 headlight ECU sub-assembly LH connector.

    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
      A31-4 (IG) - Body ground LA-R - Body ground Ignition power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A31-13 (ECUB) - Body ground G - Body ground Power supply Approximately 15 seconds elapsed after turning the power switch off Below 1 V
      Power switch on (IG) or within approximately 15 seconds of power switch being turned off 9.5 to 14 V
      A31-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A31 headlight ECU sub-assembly LH connector.

      Tech Tips


      • Since the A31 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

      • Since the B and C headlight ECU sub-assembly RH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A31-16 (SBR) - A31-15 (SGR)*1 R - GR Rear height control sensor sub-assembly LH power supply Power switch off Below 1 V
      Power switch on (IG) 4.75 to 5.25 V
      A31-17 (SHRL) - A31-15 (SGR)*1 LG - GR Rear height control sensor sub-assembly LH signal input Power switch on (IG), vehicle unloaded, vehicle stopped (value decreases as the front of the vehicle is raised)
      A31-20 (LINL) - Body ground B - Body ground LIN communication line Power switch off Below 1 V
      Power switch on (IG) Pulse generation
      B-10 - B-1 - Daytime running lights/clearance lights power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights and clearance lights on 11 to 14 V
      B-16 - B-1 - Daytime running lights/clearance lights control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights and clearance lights on Pulse generation
      B-2 - B-3 - Low beam headlights/high beam headlights drive output Low beam headlights and high beam headlights off Below 1 V
      Low beam headlights or high beam headlights on 24.2 to 35.4 V
      B-4 - B-14 - Low beam fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.75 to 5.25 V
      B-15 - B-14 - Low beam fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-6 - B-5*3 - Cornering light drive output Cornering light off Below 1 V
      Cornering light on Pulse generation
      B-9 - B-17 - Headlight leveling motor power source Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      B-19 - B-11 - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      C-3 - Body ground*2 - LIN communication line Power switch off Below 1 V
      Power switch on (IG) Pulse generation
      C-13 - Body ground - LIN communication line Power switch off Below 1 V
      Power switch on (IG) Pulse generation

      *1: w/o Adaptive Variable Suspension System

      *2: w/ Adaptive High Beam System

      *3: w/ Cornering Light

  3. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

    B004R8BN41

    1. Disconnect the A32 headlight ECU sub-assembly RH connector.

    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
      A32-4 (IG) - Body ground LA-R - Body ground Ignition power supply Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      A32-13 (ECUB) - Body ground R - Body ground Power supply Approximately 15 seconds elapsed after turning the power switch off Below 1 V
      Power switch on (IG) or within approximately 15 seconds of power switch being turned off 9.5 to 14 V
      A32-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A32 headlight ECU sub-assembly RH connector.

      Tech Tips


      • Since the A32 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

      • Since the B and C headlight ECU sub-assembly RH connectors are connected inside the headlight assembly, the voltage and pulses cannot be checked directly. The values listed are for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A32-20 (LINL) - Body ground B - Body ground LIN communication line Power switch off Below 1 V
      Power switch on (IG) Pulse generation
      B-10 - B-1 - Daytime running lights/clearance lights power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights and clearance lights on 11 to 14 V
      B-16 - B-1 - Daytime running lights/clearance lights control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights and clearance lights on Pulse generation
      B-2 - B-3 - Low beam headlights/high beam headlights drive output Low beam headlights and high beam headlights off Below 1 V
      Low beam headlights or high beam headlights on 24.2 to 35.4 V
      B-4 - B-14 - Low beam fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.75 to 5.25 V
      B-15 - B-14 - Low beam fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-6 - B-5*2 - Cornering light drive output Cornering light off Below 1 V
      Cornering light on Pulse generation
      B-9 - B-17 - Headlight leveling motor power source Power switch off Below 1 V
      Power switch on (IG) 11 to 14 V
      B-19 - B-11 - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      C-3 - Body ground*1 - LIN communication line Power switch off Below 1 V
      Power switch on (IG) Pulse generation
      C-13 - Body ground - LIN communication line Power switch off Below 1 V
      Power switch on (IG) Pulse generation

      *1: w/ Adaptive High Beam System

      *2: w/ Cornering Light

  4. CHECK COMBINATION METER ASSEMBLY

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  5. CHECK OBJECT RECOGNITION CAMERA (w/ Pre-collision System [for Stereo Camera Type])

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  6. CHECK FORWARD RECOGNITION CAMERA (w/ Pre-collision System [for Mono Camera Type])

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  7. CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU

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  8. CHECK NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU

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