LIGHTING SYSTEM TERMINALS OF ECU


  1. CHECK JUNCTION BLOCK ASSEMBLY LH, MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B006OZRC08
    *A Main Body ECU (Multiplex Network Body ECU) with 3 connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -
    B006N0YC06
    *A Main Body ECU (Multiplex Network Body ECU) with 2 connectors - -
    *1 Main Body ECU (Multiplex Network Body ECU) - -

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

      Click here

    2. Connect the junction block assembly LH connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A-11 (GND1) - Body ground - Ground Always Below 1 Ω
      A-30 (ACC) - Body ground - ACC power supply Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
      A-31 (BECU) - Body ground - Battery power supply Always 11 to 14 V
      A-32 (IG) - Body ground - Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

    4. Install the main body ECU (multiplex network body ECU) to the junction block assembly LH.

      Click here

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G63-1 (DIM) - Body ground LG - Body ground H-LP RH relay drive output Engine switch off 11 to 14 V
      Engine switch on (IG) Below 1 V
      G63-8 (A) - Body ground P - Body ground Headlight dimmer switch (light control switch) AUTO signal input Headlight dimmer switch (light control switch) not in AUTO position 11 to 14 V
      Headlight dimmer switch (light control switch) in AUTO position Below 1 V
      G63-10 (HF) - Body ground SB - Body ground Headlight dimmer switch high flash signal input Headlight dimmer switch not in high flash position 11 to 14 V
      Headlight dimmer switch in high flash position Below 1 V
      G63-12 (HEAD) - Body ground G - Body ground Headlight dimmer switch (light control switch) head signal input Headlight dimmer switch (light control switch) not in head position 11 to 14 V
      Headlight dimmer switch (light control switch) in head position Below 1 V
      G63-19 (CLTB) - G63-21 (CLTE) L - G Automatic light control sensor power supply output Engine switch on (IG), headlight dimmer switch in AUTO 11 to 14 V
      G63-22 (TAIL) - Body ground LG - Body ground Headlight dimmer switch (light control switch) tail signal input Headlight dimmer switch (light control switch) in neither tail nor head position 11 to 14 V
      Headlight dimmer switch (light control switch) in tail or head position Below 1 V
      G63-24 (HU) - Body ground Y - Body ground Headlight dimmer switch high signal input Headlight dimmer switch in low position 11 to 14 V
      Headlight dimmer switch in high or high flash position Below 1 V
      G63-23 (RFOG) - Body ground* L - Body ground Rear fog light switch input Rear fog light switch off 11 to 14 V
      Rear fog light switch on Below 1 V
      G63-26 (FFOG) - Body ground GR - Body ground Front fog light switch input Front fog light switch off 11 to 14 V
      Front fog light switch on Below 1 V
      4F-30 (HRLY) - Body ground R - Body ground H-LP LH relay drive output Engine switch off 11 to 14 V
      Engine switch on (IG) Below 1 V
      4F-31 (FFGO) - Body ground V - Body ground Front fog light signal output Headlight dimmer switch (light control switch) in tail or head position and front fog light switch off 11 to 14 V
      Headlight dimmer switch (light control switch) in tail or head position and front fog light switch on Below 1 V
      4H-14 (RFGO) - Body ground* P - Body ground Rear fog light signal output Headlight dimmer switch (light control switch) in tail or head position and rear fog light switch off Below 1 V
      Headlight dimmer switch (light control switch) in tail or head position and rear fog light switch on 11 to 14 V

      *: w/ Rear Fog Light

    6. Measure the voltage and check the waveform between each connector terminal using an oscilloscope according to the value(s) in the table below.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G63-20 (CLTS) - Body ground R - Body ground Automatic light control sensor signal input Engine switch on (IG), headlight dimmer switch (light control switch) in AUTO position and automatic light control sensor covered with a hand → Automatic light control sensor exposed to ambient light

      Pulse generation

      (waveform varies depending on light volume)
      G63-6 (FLCY) - Body ground GR - Body ground Front door courtesy light switch LH signal Front door LH open Below 1 V
      Front door LH closed Pulse generation
      G63-27 (FRCY) - Body ground L - Body ground Front door courtesy light switch RH signal Front door RH open Below 1 V
      Front door RH closed Pulse generation
      4D-18 (RCTY) - Body ground LG - Body ground Rear door courtesy light switch RH signal Slide door RH open Below 1 V
      Slide door RH closed Pulse generation
      4H-23 (LCTY) - Body ground L - Body ground Rear door courtesy light switch LH signal Slide door LH open Below 1 V
      Slide door LH closed Pulse generation

  2. CHECK COMBINATION METER ASSEMBLY

    B006N4GN02

    1. Disconnect the G16 and G17 combination meter assembly connectors.

    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
      G16-1 (B) - Body ground P - Body ground Battery power supply Always 11 to 14 V
      G16-2 (IG+) - Body ground G - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG)

      11 to 14 V*1

      10.5 to 16 V*2
      G17-1 (B) - Body ground G - Body ground Battery power supply Always 11 to 14 V
      G16-21 (ES) - Body ground BR - Body ground Ground Always Below 1 Ω

      • *1: w/o Stop and Start System

      • *2: w/ Stop and Start System

    3. Reconnect the G16 and G17 combination meter assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      G16-25 (SW) - Body ground B - Body ground Turn signal switch (full turn position) signal input Engine switch on (IG), turn signal switch off 11 to 14 V
      Engine switch on (IG), turn signal switch in full turn position Below 1 V
      G16-26 (ER) - Body ground V - Body ground Turn signal switch (right turn position) signal input Engine switch on (IG), turn signal switch off 11 to 14 V
      Engine switch on (IG), turn signal switch in right turn position Below 1 V
      G16-27 (EL) - Body ground R - Body ground Turn signal switch (left turn position) signal input Engine switch on (IG), turn signal switch off 11 to 14 V
      Engine switch on (IG), turn signal switch in left turn position Below 1 V
      G17-7 (LR) - Body ground SB - Body ground Turn signal switch (right turn position) signal output Engine switch on (IG), turn signal switch off Below 1 V
      Engine switch on (IG), turn signal switch in right turn position Below 1 V ←→ 11 to 14 V
      G17-13 (LL) - Body ground Y - Body ground Turn signal switch (left turn position) signal output Engine switch on (IG), turn signal switch off Below 1 V
      Engine switch on (IG), turn signal switch in left turn position Below 1 V ←→ 11 to 14 V

  3. CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH (MAIN)

    B006R7CC04
    *A w/ Cornering Light - -

    1. Disconnect the A28 headlight light control ECU sub-assembly LH (main) 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
      A28-4 (IG) - Body ground B - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A28-13 (ECUB) - Body ground L - Body ground Power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A28-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A28 headlight light control ECU sub-assembly LH (main) connector.

      Tech Tips

      Since the headlight light control ECU sub-assembly LH (main) uses waterproof connectors, the voltage, resistance and waveform cannot be checked directly. The voltage, resistance and waveform are indicated for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A28-11 (TNS) - Body ground Y - Body ground Turn signal light signal input Left turn signal light blinking Below 1 V ←→ 11 to 14 V
      Left turn signal light off Below 1 V
      A28-16 (SBR) - A28-15 (SGR) V - B Rear height control sensor power supply Engine switch on (IG) Approximately 5 V
      A28-17 (SHRL) - A28-15 (SGR) GR - B Rear height control sensor signal input

      Engine switch on (IG)

      (No passengers, no luggage, vehicle not moving)

      Approximately 2.5 V

      (vehicle level) (value decreases as the front of the vehicle is raised)
      A28-20 (LINL) - Body ground L - Body ground LIN communication Engine switch on (IG) Pulse generation
      B-4 - B-3 - Headlight light signal output Headlight dimmer switch (light control switch) in off position Below 1 V
      Headlight dimmer switch (light control switch) in head, high or high flash position 23.2 to 36.8 V
      B-10 - B-1 - Headlight light signal output Headlight dimmer switch (light control switch) in head or low position Below 1 V
      Headlight dimmer switch (light control switch) in high or high flash position 11 to 14 V
      B-20 - B-11*1 - Clearance light signal output Clearance light blinking Below 1 V
      Clearance light off 11 to 14 V
      B-16 - B-11*1 - Clearance light signal output Clearance light on

      Pulse generation

      (See waveform 1)
      B-16 - B-11*1 - Daytime running light signal output Daytime running light on Below 1 V
      B-20 - B-11*2 - Clearance light signal output Clearance light on 11 to 14 V
      Clearance light off Below 1 V
      B-9 - B-13 - Turn signal light signal output Left turn indicator light blinking Below 1 V
      Left turn indicator light off 11 to 14 V
      B-7 - B-17 - Headlight leveling motor power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      B-8 - B-17 - Power supply signal output Engine switch on (IG), when low beam headlights turn on, vehicle height not changed 11 to 14 V
      Engine switch on (IG), when low beam headlights turn on, vehicle height changed and maintained for more than 3 seconds Below 1 V
      B-17 - Body ground - Ground Always Below 1 Ω
      C-8 - C-7*1 - Cornering light signal output Left turn indicator light blinking 10.8 to 17 V
      Left turn indicator light off Below 1 V

      *1: w/ Cornering Light

      *2: w/o Cornering Light

    5. B006NCDE01

      Using an oscilloscope, check waveform.

      Note

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      Waveform 1 (Reference)
      Item Content
      Tester Connection B-16 - B-11
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Condition Clearance light on

  4. CHECK HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH (SUB)

    B006R7CC05
    *A w/ Cornering Light - -

    1. Disconnect the A29 headlight light control ECU sub-assembly RH (sub) 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
      A29-4 (IG) - Body ground V - Body ground Ignition power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A29-13 (ECUB) - Body ground R - Body ground Power supply Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      A29-12 (GND) - Body ground W-B - Body ground Ground Always Below 1 Ω

    3. Reconnect the A29 headlight light control ECU sub-assembly RH (sub) connector.

      Tech Tips

      Since the headlight light control ECU sub-assembly RH (sub) uses waterproof connectors, the voltage, resistance and waveform cannot be checked directly. The voltage, resistance and waveform are indicated for reference only.

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

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A29-11 (TNS) - Body ground V - Body ground Turn signal light signal input Left turn signal light blinking Below 1 V ←→ 11 to 14 V
      Left turn signal light off Below 1 V
      A29-20 (LINL) - Body ground L - Body ground LIN communication Engine switch on (IG) Pulse generation
      B-4 - B-3 - Headlight light signal output Headlight dimmer switch (light control switch) in off position Below 1 V
      Headlight dimmer switch (light control switch) in head, low, high or high flash position 23.2 to 36.8 V
      B-10 - B-1 - Headlight light signal output Headlight dimmer switch (light control switch) in head or low position Below 1 V
      Headlight dimmer switch (light control switch) in high or high flash position 11 to 14 V
      B-20 - B-11*1 - Clearance light signal output Clearance light blinking Below 1 V
      Clearance light off 11 to 14 V
      B-16 - B-11*1 - Clearance light signal output Clearance light on

      Pulse generation

      (See waveform 1)
      B-16 - B-11*1 - Daytime running light signal output Daytime running light off Below 1 V
      B-20 - B-11*2 - Clearance light signal output Clearance light on 11 to 14 V
      Clearance light off Below 1 V
      B-9 - B-13 - Turn signal light signal output Left turn indicator light blinking Below 1 V
      Left turn indicator light off 11 to 14 V
      B-7 - B-17 - Headlight leveling motor power supply Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      B-8 - B-17 - Power supply signal output With low beam headlights on, vehicle height not changed 11 to 14 V
      With low beam headlights on, vehicle height changed and maintained for more than 3 seconds Below 1 V
      B-17 - Body ground - Ground Always Below 1 Ω
      C-8 - C-7*1 - Cornering light signal output Left turn indicator light blinking 10.8 to 17 V
      Left turn indicator light off Below 1 V

      *1: w/ Cornering Light

      *2: w/o Cornering Light

    5. B006NCDE01

      Using an oscilloscope, check waveform.

      Note

      The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

      Waveform 1 (Reference)
      Item Content
      Tester Connection B-16 - B-11
      Tool Setting 2 V/DIV., 1 ms./DIV.
      Condition Clearance light on