LIGHTING SYSTEM TERMINALS OF ECU


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

    B001MY7E02

    1. Disconnect the instrument panel junction block assembly and main body ECU (multiplex network 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
      2A-20 - Body ground*1 B - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      2B-6 - Body ground W-B - Body ground Ground Always Below 1 Ω
      2C-18 - Body ground*2 B - Body ground Auxiliary battery power supply Power switch off 11 to 14 V

      2E-1 - Body ground*3

      2F-1 - Body ground*4

      		 W - Body ground Auxiliary battery power supply Power switch off 11 to 14 V
      H17-3 (GND2) - Body ground W-B - Body ground Ground Always Below 1 Ω

      • *1: for LHD Europe, for RHD

      • *2: except LHD Europe, except RHD

      • *3: for LHD

      • *4: for RHD

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

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

      Terminal No. (Symbol) Terminal No. (Symbol) Terminal Description Condition Condition
      2A-55 - Body ground*1 LG - Body ground Rear fog light drive output Power switch off 11 to 14 V
      2B-7 - Body ground BR - Body ground Taillight, rear side marker light*2 and RR FOG relay*1 drive output Light control switch not in tail position Below 1 V
      Light control switch in tail position 11 to 14 V
      2B-14 - Body ground*3 SB - Body ground Auto high beam switch signal input Auto high beam switch on Below 1 V
      Auto high beam switch off 11 to 14 V
      2C-8 - Body ground*4 LG - Body ground Front fog lights drive output Light control switch in tail or head position, fog light switch in front position 11 to 14 V
      Light control switch in tail or head position, fog light switch off Below 1 V
      2C-10 - Body ground BR - Body ground Clearance lights drive output Light control switch not in tail position Below 1 V
      Light control switch in tail position 11 to 14 V
      2C-20 - 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-22 - 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
      2C-32 - Body ground G - Body ground No. 1 integration relay drive output Light control switch in head position Below 1 V
      Light control switch not in head position 11 to 14 V
      2D-18 - Body ground BR - Body ground Taillights, rear side marker light*2 and license plate lights drive output Light control switch not in tail position Below 1 V
      Light control switch in tail position 11 to 14 V
      H16-1 (RFOG) - Body ground*1 W - Body ground Rear fog light switch input Rear fog light switch on Below 1 V
      Rear fog light switch off 11 to 14 V
      H16-3 (HAZ) - Body ground Y - Body ground Hazard warning signal switch indicator output Hazard switch on Below 1 V
      Hazard switch off 9 V or higher
      H16-5 (HU) - Body ground P - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high 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 11 to 14 V
      H16-15 (DRL) - 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
      H16-20 (CLTB) - H16-22 (CLTE) R - B 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
      Power switch on (IG) and automatic light control system operates

      Pulse generation

      (See waveform 1)
      H16-27 (FFOG) - Body ground*4 LG - Body ground Front fog light switch input Front fog light switch on Below 1 V
      Front fog light switch off 11 to 14 V
      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 11 to 14 V
      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 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 not in tail or head position 11 to 14 V
      H17-4 (MILE) - Body ground*5 R - Body ground Door mirror foot lights drive output Door mirror foot lights off Below 1 V
      Door mirror foot lights on 11 to 14 V
      H17-5 (HZCT) - Body ground GR - Body ground Turn signal light control signal Turn signal lights blinking Below 1 V ←→ 11 to 14 V
      H17-8 (RLEW) - Body ground*6 B - Body ground Light control LED ECU signal input Power switch on (IG), light control switch off 11 to 14 V
      Power switch on (IG), light control switch in head position Pulse generation
      H17-16 (TRNR) - Body ground P - Body ground Turn signal flasher RH drive output Turn signal switch not in right turn position 11 to 14 V
      Turn signal switch in right turn position Below 1 V
      H17-17 (HZSW) - Body ground R - Body ground Hazard warning signal switch input Hazard switch on Below 1 V
      Hazard switch off 11 to 14 V
      H17-20 (RFGO) - Body ground*1 LG - Body ground Rear fog light relay power supply output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      H17-21 (LLEW) - Body ground*6 B - Body ground Light control LED ECU signal input Power switch on (IG), light control switch off 11 to 14 V
      Power switch on (IG), light control switch in head position Pulse generation
      H17-25 (TRI) - Body ground P - Body ground Turn signal switch RH input Turn signal switch not in right turn position 11 to 14 V
      Turn signal switch in right turn position Below 1 V
      H17-26 (TLI) - Body ground B - Body ground Turn signal switch LH input Turn signal switch not in left turn position 11 to 14 V
      Turn signal switch in left turn position Below 1 V
      H18-5 (TRNL) - Body ground B - Body ground Turn signal flasher LH drive output Turn signal switch not in left turn position 11 to 14 V
      Turn signal switch in left turn position Below 1 V
      H18-13 (CNRI) - Body ground L - Body ground Turn signal switch position input Turn signal switch in off or half turn position 11 to 14 V
      Turn signal switch in full turn position Below 1 V

      • *1: w/ Rear Fog Light

      • *2: w/ Rear Side Marker Light

      • *3: w/ Automatic High Beam System

      • *4: w/ Front Fog Light

      • *5: w/o Seat Position Memory

      • *6: for LED Headlight


      1. B001MLFE01

        Waveform 1

        Item Content
        Tester Connection H16-21 (CLTS) - Body ground
        Tool setting 5 V/DIV., 5 ms./DIV.
        Condition Power switch on (IG) and automatic light control system operates

        Tech Tips

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

  2. CHECK POWER MANAGEMENT CONTROL ECU

    B001LWXE01

    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) - Body ground LG - Body ground Back up light signal Power switch on (IG), reverse (R) selected 11 to 14 V

  3. CHECK HEADLIGHT LEVELING ECU ASSEMBLY (for LED Headlight)

    B001LNXE02

    1. Disconnect the A46 headlight leveling ECU assembly 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
      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
      A46-9 (E1) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Connect the A46 headlight leveling ECU assembly connector.

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

      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 Headlight 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 Headlight 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 sub-assembly 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 Headlight 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 Headlight 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 sub-assembly signal input Power switch off Below 1 V
      Power switch on (IG) 0.5 to 4.5 V
      A46-21 (SGR) - Body ground Y - Body ground Rear height control sensor sub-assembly ground Always Below 1 Ω
      A46-23 (RH-) - Body ground BR - Body ground Headlight leveling motor RH ground Always Below 1 Ω
      A46-24 (LH-) - Body ground LG - Body ground Headlight leveling motor LH ground Always Below 1 Ω

      1. B001ML1E01

        Waveform 1

        Item Content
        Tester Connection A46-16 (SPDR) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Vehicle is driven at approx. 20 km/h (12mph)

  4. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (for LH) (w/ Seat Position Memory)

    B001M47E02

    1. Disconnect the K7 outer mirror control ECU assembly (for LH) connector.

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

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      K7-5 (SIG) - Body ground Y - Body ground Ignition power supply Power switch off → on (IG) Below 1 V → 11 to 14 V
      K7-6 (CPUB) - Body ground LG - Body ground +B power supply Power switch off 11 to 14 V
      K7-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      K7-14 (BDR) - Body ground L - Body ground +B power supply Power switch off 11 to 14 V

    3. Connect the K7 outer mirror control ECU assembly (for LH) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      z6-2 (LP) - z6-12 (HTR-) Y - BR Door mirror foot light drive output Door mirror foot light off → on Below 1 V → 11 to 14 V

  5. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (for RH) (w/ Seat Position Memory)

    B001LRYE02

    1. Disconnect the J8 outer mirror control ECU assembly (for RH) connector.

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

      Tech Tips

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      J8-5 (SIG) - Body ground Y - Body ground Ignition power supply Power switch off → on (IG) Below 1 V → 11 to 14 V
      J8-6 (CPUB) - Body ground LG - Body ground +B power supply Power switch off 11 to 14 V
      J8-7 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω
      J8-14 (BDR) - Body ground L - Body ground +B power supply Power switch off 11 to 14 V

    3. Connect the J8 outer mirror control ECU assembly (for RH) connector.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      z7-2 (LP) - z7-12 (HTR-) Y - BR Door mirror foot light drive output Door mirror foot light off → on Below 1 V → 11 to 14 V

  6. CHECK FORWARD RECOGNITION CAMERA (w/ Automatic High Beam System)

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