LIGHTING SYSTEM TERMINALS OF ECU


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

    B005PPOC10
    *A for LHD *B for RHD

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

    2. Measure the voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2B-23 - Body ground*2 GR - Body ground Battery power supply Always 11 to 14 V
      2C-1 - Body ground*3 W - Body ground Battery power supply Always 11 to 14 V
      2E-1 - Body ground*4 B - Body ground Battery power supply Always 11 to 14 V
      2G-1 - Body ground*5 B - Body ground Battery power supply Always 11 to 14 V

      If the result is not as specified, there may be a malfunction in the wire harness.

    3. Measure the resistance on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      2B-3 - 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
      2D-30 - Body ground B - Body ground Taillights and license plate lights drive output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      2C-32 - Body ground SB - Body ground Tail signal output Light control switch in tail or head position 11 to 14 V
      Light control switch off Below 1 V
      2C-25 - Body ground B - Body ground Front fog light drive output Light control switch in tail or head position, fog light switch in front position Below 1 V
      Light control switch in tail or head position, fog light switch off 11 to 14 V
      2D-21 - Body ground*1 B - Body ground Rear fog light drive output Light control switch in tail or head position, fog light switch in rear position 11 to 14 V
      Light control switch in tail or head position, fog light switch off Below 1 V
      2C-31 - Body ground V - Body ground H-LP LH relay drive output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      J8-1 (DIM) - Body ground L - Body ground H-LP RH relay drive output Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      J8-8 (A) - Body ground G - 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
      J8-10 (HF) - Body ground W - 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
      J8-12 (HEAD) - Body ground Y - Body ground Light control switch head position input Light control switch in head position Below 1 V
      Light control switch not in head position Pulse generation
      J8-19 (CLTB) - J8-21 (CLTE) V - Y Automatic light control sensor power supply output Engine switch off Below 1 V
      Engine switch on (IG 11 to 14 V
      J8-20 (CLTS) - Body ground BE - Body ground Automatic light control sensor signal input Engine switch off Below 1 V
      Automatic light control system operating

      Communication waveform generation

      (See waveform 1)
      J8-22 (TAIL) - Body ground V - 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 Pulse generation
      J8-23 (RFOG) - Body ground*1 LG - Body ground Fog light switch rear position input Fog light switch in rear position Below 1 V
      Fog light switch off Pulse generation
      J8-24 (HU) - Body ground GR - Body ground Dimmer switch high position signal input Dimmer switch in high position Below 1 V
      Dimmer switch not in high position Pulse generation
      J8-26 (FFOG) - Body ground SB - Body ground Fog light switch front position input Fog light switch in front position Below 1 V
      Fog light switch off Pulse generation
      J9-4 (MILE) - Body ground SB - Body ground Outside handle foot lights drive output Outside handle foot light illuminates 11 to 14 V
      Outside handle foot light off Below 3 V

      • *1: w/ Rear Fog Light

      • *2: w/o Canister Pump Module with Door Ajar Warning Function

      • *3: w/ Canister Pump Module or Door Ajar Warning Function

      • *4: for LHD

      • *5: for RHD

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


      1. B005L22N01

        Waveform 1

        Item Content
        Tool setting 2 V/DIV., 10 ms./DIV.

        Tech Tips

        The communication waveform changes according to the surrounding brightness.

  2. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for Single Beam Headlight)

    B005M83N07

    1. Disconnect the A49 headlight ECU sub-assembly LH connector.

    2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A49-4 (IG) - Body ground R - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A49-13 (ECUB) - Body ground G - Body ground Battery power supply Light control switch off Below 1 V
      Light control switch in tail or head position 11 to 14 V
      A49-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A49 headlight ECU sub-assembly LH connector.

      Tech Tips


      • Since the A49 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage cannot be measured and pulses cannot be checked for directly. The values listed are for reference only.

      • Since the B headlight ECU sub-assembly LH connector is connected inside the headlight assembly, the voltage cannot be measured and pulses cannot be checked for 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
      A49-9 (CRSL) - Body ground Y - Body ground Cornering light LH drive output Cornering light LH off 11 to 14 V
      Cornering light LH on Pulse generation
      A49-11 (TNS) - Body ground G - Body ground Left turn signal light signal input Engine switch on (IG), left turn signal light off Below 1 V
      Engine switch on (IG), left turn signal light blinking 11 to 14 V ←→ Below 1 V
      A49-16 (SBR) - A49-15 (SGR) W - R Rear height control sensor sub-assembly RH power supply Engine switch on (IG) 4.75 to 5.25 V
      A49-17 (SHRL) - A49-15 (SGR) SB - R Rear height control sensor sub-assembly RH signal input Engine switch on (IG), vehicle unloaded, vehicle stopped

      Approximately 2.5 V

      (value decreases as the front of the vehicle is raised)
      A49-20 (LINL) - Body ground P - Body ground LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-1 - B-10 - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-4 - B-5 - 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 11.2 to 17.7 V
      B-6 - B-14 - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.5 to 5.5 V
      B-7 - B-17 - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-8 - B-17 - Headlight leveling motor signal output Engine switch on (IG), low beam headlights on, vehicle height not changed Below 1 V
      Engine switch on (IG), low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14 V
      B-9 - B-13 - Left turn signal light signal output Engine switch on (IG), left turn signal light off Below 1 V
      Engine switch on (IG), left turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-11 - B-16 - Daytime running lights/clearance lights control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on Pulse generation
      B-14 - B-15 - Headlight fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-11 - B-20 - Daytime running lights/clearance lights power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on 11 to 14 V

  3. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (for Triple Beam Headlight)

    B005LUVN08

    1. Disconnect the A49 headlight ECU sub-assembly LH connector.

    2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A49-4 (IG) - Body ground R - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A49-13 (ECUB) - Body ground G - Body ground Battery power supply Light control switch off Below 1 V
      Light control switch in tail or head position 11 to 14 V
      A49-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A49 headlight ECU sub-assembly LH connector.

      Tech Tips


      • Since the A49 headlight ECU sub-assembly LH connector is a waterproof type connector, the voltage cannot be measured and pulses cannot be checked for directly. The values listed are for reference only.

      • Since the B and C headlight ECU sub-assembly LH connectors are connected inside the headlight assembly, the voltage cannot be measured and pulses cannot be checked for 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
      A49-9 (CRSL) - Body ground Y - Body ground Cornering light LH drive output Cornering light LH off 11 to 14 V
      Cornering light LH on Pulse generation
      A49-11 (TNS) - Body ground G - Body ground Left turn signal light signal input Engine switch on (IG), Left turn signal light off Below 1 V
      Engine switch on (IG), Left turn signal light blinking 11 to 14 V ←→ Below 1 V
      A49-16 (SBR) - A49-15 (SGR) W - R Rear height control sensor sub-assembly RH power supply Engine switch on (IG) 4.75 to 5.25 V
      A49-17 (SHRL) - A49-15 (SGR) SB - R Rear height control sensor sub-assembly RH signal input Engine switch on (IG), vehicle unloaded, vehicle stopped

      Approximately 2.5 V

      (value decreases as the front of the vehicle is raised)
      A49-20 (LINL) - Body ground P - Body ground LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A49-21 (LCL) - Body ground W - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A49-22 (LCH) - Body ground

      G - Body ground*2

      R - Body ground*1, *3

      B - Body ground*1, *4

      		 CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-1 - B-10*1 - Headlight light control ECU sub-assembly LH power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-3 - B-4 - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 16.05 to 25.65 V
      B-6 - B-14 - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.5 to 5.5 V
      B-7 - B-17 - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-9 - B-13 - Left turn signal light signal output Engine switch on (IG), left turn signal light off Below 1 V
      Engine switch on (IG), left turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-11 - B-16 - Daytime running lights/clearance lights control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on Pulse generation
      B-14 - B-15 - Headlight fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-11 - B-20 - Daytime running lights/clearance lights power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on 11 to 14 V
      C-7 - C-8 -

      • Add high beam headlights drive output*1

      • High beam headlights drive output*2

      		 High beam headlights off Below 1 V
      High beam headlights on

      16.05 to 25.65 V*2

      6 to 15 V*1
      C-13 - Body ground - LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation

      • *1: w/ Adaptive High Beam System

      • *2: w/o Adaptive High Beam System

      • *3: for 2GR-FKS

      • *4: for 8AR-FTS

  4. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for Single Beam Headlight)

    B005M83N08

    1. Disconnect the A50 headlight ECU sub-assembly RH connector.

    2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A50-4 (IG) - Body ground

      R - Body ground*1

      B - Body ground*2

      		 Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A50-13 (ECUB) - Body ground R - Body ground Battery power supply Light control switch off Below 1 V
      Light control switch in tail or head position 11 to 14 V
      A50-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      • *1: for 2GR-FKS

      • *2: for 8AR-FTS

    3. Reconnect the A50 headlight ECU sub-assembly RH connector.

      Tech Tips


      • Since the A50 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage cannot be measured and pulses cannot be checked for directly. The values listed are for reference only.

      • Since the B headlight ECU sub-assembly RH connector is connected inside the headlight assembly, the voltage cannot be measured and pulses cannot be checked for 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
      A50-9 (CRSR) - Body ground LG - Body ground Cornering light RH drive output Cornering light RH off 11 to 14 V
      Cornering light RH on Pulse generation
      A50-11 (TNS) - Body ground V - Body ground Right turn signal light signal input Engine switch on (IG), right turn signal light off Below 1 V
      Engine switch on (IG), right turn signal light blinking 11 to 14 V ←→ Below 1 V
      A50-20 (LINL) - Body ground P - Body ground LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-1 - B-10 - High beam headlights drive output High beam headlights off Below 1 V
      High beam headlights on 11 to 14 V
      B-4 - B-5 - 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 11.2 to 17.7 V
      B-6 - B-14 - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.5 to 5.5 V
      B-7 - B-17 - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-8 - B-17 - Headlight leveling motor signal output Engine switch on (IG), low beam headlights on, vehicle height not changed Below 1 V
      Engine switch on (IG), low beam headlights on, vehicle height changed and maintained for more than 3 seconds 1.0 to 14 V
      B-9 - B-13 - Right turn signal light signal output Engine switch on (IG), right turn signal light off Below 1 V
      Engine switch on (IG), right turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-11 - B-16 - Daytime running lights/clearance lights control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on Pulse generation
      B-14 - B-15 - Headlight fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-11 - B-20 - Daytime running lights/clearance lights power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on 11 to 14 V

  5. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (for Triple Beam Headlight)

    B005LUVN12

    1. Disconnect the A50 headlight ECU sub-assembly RH connector.

    2. Measure the resistance and voltage on the wire harness side connector according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A50-4 (IG) - Body ground

      R - Body ground*1

      B - Body ground*2

      		 Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A50-13 (ECUB) - Body ground R - Body ground Battery power supply Light control switch off Below 1 V
      Light control switch in tail or head position 11 to 14 V
      A50-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

      • *1: for 2GR-FKS

      • *2: for 8AR-FTS

    3. Reconnect the A50 headlight ECU sub-assembly RH connector.

      Tech Tips


      • Since the A50 headlight ECU sub-assembly RH connector is a waterproof type connector, the voltage cannot be measured and pulses cannot be checked for 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 cannot be measured and pulses cannot be checked for 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
      A50-9 (CRSR) - Body ground LG - Body ground Cornering light RH drive output Cornering light RH off 11 to 14 V
      Cornering light RH on Pulse generation
      A50-11 (TNS) - Body ground V - Body ground Right turn signal light signal input Engine switch on (IG), right turn signal light off Below 1 V
      Engine switch on (IG), right turn signal light blinking 11 to 14 V ←→ Below 1 V
      A50-20 (LINL) - Body ground P - Body ground LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A50-21 (LCL) - Body ground W - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      A50-22 (LCH) - Body ground G - Body ground CAN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation
      B-1 - B-10*1 - Headlight light control ECU sub-assembly RH power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-3 - B-4 - Low beam headlights drive output Low beam headlights off Below 1 V
      Low beam headlights on 16.05 to 25.65 V
      B-6 - B-14 - Headlight fan power source Low beam headlights off Below 1 V
      Low beam headlights on 4.5 to 5.5 V
      B-7 - B-17 - Headlight leveling motor power source Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      B-9 - B-13 - Right turn signal light signal output Engine switch on (IG), right turn signal light off Below 1 V
      Engine switch on (IG), right turn signal light blinking 11 to 14 V ←→ Below 1 V
      B-11 - B-16 - Daytime running lights/clearance lights control signal output Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on Pulse generation
      B-15 - B-14 - Headlight fan control signal input Low beam headlights off Below 1 V
      Low beam headlights on Pulse generation
      B-11 - B-20 - Daytime running lights/clearance lights power source Daytime running lights and clearance lights off Below 1 V
      Daytime running lights or clearance lights on 11 to 14 V
      C-7 - C-8 -

      • Add high beam headlights drive output*1

      • High beam headlights drive output*2

      		 High beam headlights off Below 1 V
      High beam headlights on

      16.05 to 25.65 V*2

      6 to 15 V*1
      C-13 - Body ground - LIN communication line Engine switch off Below 1 V
      Engine switch on (IG) Pulse generation

      • *1: w/ Adaptive High Beam System

      • *2: w/o Adaptive High Beam System

  6. CHECK COMBINATION METER ASSEMBLY

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