LIGHTING SYSTEM TERMINALS OF ECU


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

    A003WXRE21

    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: for LHD

      • *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

      Tech Tips

      *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.


      1. A003X6LE01

        Waveform 1

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

        Tech Tips

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

  2. CHECK POWER MANAGEMENT CONTROL ECU

    A003WHCE34

    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.

  3. CHECK HEADLIGHT LEVELING ECU ASSEMBLY


    1. Disconnect the A46 headlight leveling ECU assembly connector.

      A003X4UE18

    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.


      1. A003WSRE01

        Waveform 1

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

  4. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (LH SIDE)

    A003WTNE30

    1. Disconnect the K7 connector.

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

      Tech Tips

      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.

      Tech Tips

      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

  5. CHECK OUTER MIRROR CONTROL ECU ASSEMBLY (RH SIDE)

    A003WTNE31

    1. Disconnect the J8 connector.

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

      Tech Tips

      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.

      Tech Tips

      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