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Terminals Of Ecu

  1. CHECK CLEARANCE WARNING ECU (w/o Advanced Parking Guidance System) 
    Fig 1: Identifying L19 ECU Connector Terminals
    G04951826Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L19 ECU connector.
    2. Measure the voltage and resistance according to value (s) in the table below.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L19-15 (IG) - L19-17 (E) V - W-B IG signal/IG power source signal Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V
      L19-17 (E) - Body ground W-B - Body ground ECU ground Always Below 1 Ω
    3. Reconnect the L19 ECU connector.
    4. Measure the resistance, voltage and waveform according to value (s) in the table below.
      RESISTANCE, VOLTAGE AND WAVEFORM SPECIFIED CONDITION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L19-1 (CBZ) - L19-17 (E) W - W-B Front clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      L19-2 (EE) - L19-17 (E) B - W-B Front clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      L19-7 (BOR) - L19-18 (E2) B-R Rear sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG), clearance sonar main switch ON 7.2 to 8.8 V
      L19-9 (SOF) - L19-19 (E1) G-R Front sensor circuit power source Engine switch on (IG), clearance sonar main switch ON Waveform 1
      L19-10 (BBZ) - L19-17 (E) W - W-B Rear clearance warning buzzer signal Engine switch off Below 1 V
      Engine switch on (IG) 7.2 to 8.8 V
      L19-11 (EF) - L19-17 (E) B - W-B Rear clearance warning buzzer signal Buzzer sounding Waveform 2
      L19-18 (E2) - L19-17 (E) R - W-B Rear sensor circuit ground Always Below 1 Ω
      L19-19 (E1) - L19-17 (E) R - W-B Front sensor circuit ground Always Below 1 Ω
      L19-21 (BOF) - L19-19 (E1) B-R Front sensor circuit power source Engine switch off Below 1 V
      Engine switch on (IG), clearance sonar main switch ON 7.2 to 8.8 V
      L19-24 (SOR) - L19-18 (E2) G-R Rear sensor circuit power source Engine switch on (IG), clearance sonar main switch ON Waveform 1
    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No. (Symbols)
      • CH: 1 L19-9 (SOF) - L19-19 (E1)
      • CH: 2 L19-24 (SOR) - L19-18 (E2)
      Tool Setting 2 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), clearance sonar main switch ON.
      Fig 2: Identifying Waveform 1
      G04951827Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No. (Symbols)
      • L19-1 (CBZ) - L19-17 (E)
      • L19-2 (EE) - L19-17 (E)
      • L19-11 (EF) - L19-17 (E)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), shift lever in R position
      Fig 3: Identifying Waveform 2
      G04951828Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • The waveforms of CBZ and EE are offset by a half cycle. EF is not synchronized with CBZ and EE.
      • The waveform's amplitude varies depending on the volume setting.
  2. CHECK PARKING ASSIST ECU (w/ Advanced Parking Guidance System) 
    Fig 4: Identifying Parking Assist ECU Connector L105, L103, L91 And L90 (W/O Advanced Parking Guidance System)
    G06192364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L90 ECU connector.
    2. Measure the voltage and resistance according to value (s) in the table below.
      VOLTAGE AND RESISTANCE SPECIFIED CONDITION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L90-1 (IG) - L90-4 (GND1) V - W-B Ignition signal input Engine switch on (IG) 11 to 14 V
      L90-4 (GND1) - Body ground W-B - Body ground Ground Always Below 1 Ω
      L90-6 (+B) - L90-4 (GND1) R - W-B Power source Always 11 to 14 V
      L90-14 (ACC) - L90-4 (GND1) LG - W-B Accessory Engine switch off Below 1 V
      Engine switch on (ACC) 11 to 14 V
    3. Reconnect the L90 ECU connector.
    4. Measure the resistance, voltage and waveform according to value (s) in the table below.
      RESISTANCE, VOLTAGE AND WAVEFORM SPECIFIED CONDITION

      Terminal No. (Symbols) Wiring Color Terminal Description Condition Specified Condition
      L90-8 (CSB3) - L90-27 (CSG3) R-V Front side sensor signal Engine switch off Below 1 V
      Engine switch on (IG), clearance sonar main switch OFF → ON 7.2 to 8.8 V
      L90-27 (CSG3) - L90-4 (GND1) V - W-B Ground Always Below 1 Ω
      L90-28 (LIN3) - L90-27 (CSG3) G-V Front side sensor signal Engine switch on (IG), clearance sonar main switch OFF → ON Waveform 1
      L91-9 (EF) - L90-4 (GND1) B - W-B Front clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      L91-25 (BBZ) - L91-19 (EF) W-B Rear clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding 7.2 to 8.8 V
      L91-26 (CBZ) - L90-4 (GND1) W - W-B Front clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      L91-27 (EE) - L90-4 (GND1) B - W-B Front clearance warning buzzer signal Buzzer not sounding Below 1 V
      Buzzer sounding Waveform 2
      L91-28 (CSB2) - L91-29 (CSG2) B-R Rear sensor signal Engine switch on (IG), clearance sonar main switch OFF → ON 7.2 to 8.8 V
      L91-29 (CSG2) - L90-4 (GND1) R - W-B Ground Always Below 1 Ω
      L91-30 (LIN2) - L90-29 (CSG2) G-R Rear sensor signal Engine switch on (IG), clearance sonar main switch OFF → ON Waveform 1
      L91-31 (CSB1) - L91-32 (CSG1) B-R Front sensor power source Engine switch on (IG), clearance sonar main switch ON 7.2 to 8.8 V
      L91-32 (CSG1) - L90-4 (GND1) R - W-B Ground Always Below 1 O
      L91-33 (LIN1) - L91-32 (CSG1) G-R Front sensor signal Engine switch on (IG), clearance sonar main switch OFF → ON Waveform 1
    5. Using an oscilloscope, check waveform 1.

      Waveform 1 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No. (Symbols)
      • CH 1: L91-33 (LIN1) - L91-32 (CSG1)
      • CH 2: L90-28 (LIN3) - L90-27 (CSG3)
      • CH 3: L91-30 (LIN2) - L91-29 (CSG2)
      Tool Setting 2 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), clearance sonar main switch ON
      Fig 5: Identifying Waveform 1
      G04951830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Using an oscilloscope, check waveform 2.

      Waveform 2 (Reference) 

      WAVEFORM REFERENCE CHART

      Item Content
      Terminal No. (Symbols)
      • L91-9 (EF) - L90-4 (GND1)
      • L91-26 (CBZ) - L90-4 (GND1)
      • L91-27 (EE) - L90-4 (GND1)
      Tool Setting 5 V/DIV., 1 msec./DIV.
      Condition Engine switch on (IG), shift lever in R position
      Fig 6: Identifying Waveform 2
      G06192366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • The waveforms of CBZ and EE are offset by a half cycle. EF is not synchronized with CBZ and EE.
      • The waveform's amplitude varies depending on the volume setting.
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