Terminals Of Ecu [12/2019 - 11/2023]

Fig 1: Clearance Warning ECU Assembly [12/2019 - 11/2023]

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the H46 clearance warning ECU assembly connector.
2. Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

   Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
   H46-1 (IG) - H46-28 (E)	IG source signal	ignition switch off	Below 1 V
   		ignition switch ON	11 to 14 V*1 10.5 to 16 V*2
   H46-28 (E) - Body ground	Ground	Always	Below 1 Ω

   1. *1: w/o Stop and Start System
   2. *2: w/ Stop and Start System
3. Reconnect the H46 clearance warning 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)	Terminal Description	Condition	Specified Condition
   H46-2 (BOF) - H46-28 (E)	Power source for front sensor circuit	Ignition switch off	Below 1 V
   		Ignition switch ON Parking support brake system on	11 to 14 V
   H46-4 (E5) - H46-28 (E)	Ground for front clearance sonar	Always	Below 1 Ω
   H46-3 (SOF) - H46-28 (E)	Front sensor communication signal (Front clearance sonar sensor)	Ignition switch ON Parking support brake system on Shift lever in any position other than P or R Vehicle speed is less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 1)
   H46-9 (CBZ) - H46-8 (EF)	No. 1 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)
   H46-25 (BBZ) - H46-26 (ER)	No. 2 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)
   H46-19 (BOR) - H46-28 (E)	Power source for rear sensor circuit	Ignition switch off	Below 1 V
   		Ignition switch ON Parking support brake system on	11 to 14 V
   H46-21 (E1) - H46-28 (E)	Ground for rear clearance sonar	Always	Below 1 Ω
   H46-20 (SOR) - H46-28 (E)	Rear sensor communication signal (Rear clearance sonar sensor)	Ignition switch ON Parking support brake system on Shift lever in R Vehicle speed is less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 3)

5. Using an oscilloscope, check waveform 1.
   1. Waveform 1 (Reference)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Measurement terminal	H46-3 (SOF) - H46-28 (E)
      Measurement setting	5 V/DIV., 1 ms./DIV.
      Condition	Ignition switch ON Parking support brake system on Shift lever in any position other than P or R Vehicle speed is less than approximately 10 km/h (6 mph)

6. Using an oscilloscope, check waveform 2.
   1. Waveform 2 (Reference)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Measurement terminal	H46-9 (CBZ) - H46-8 (EF) H46-25 (BBZ) - H46-26 (ER)
      Measurement setting	2 V/DIV., 500 μs./DIV.
      Condition	Buzzer sounding

      HINT: 

      The amplitude of the waveform changes according to the set volume.

7. Using an oscilloscope, check waveform 3.
   1. Waveform 3 (Reference)

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Measurement terminal	H46-20 (SOR) - H46-28 (E)
      Measurement setting	5 V/DIV., 1 ms./DIV.
      Condition	Ignition switch ON Parking support brake system on Shift lever in R Vehicle speed is less than approximately 10 km/h (6 mph)

Refer to TERMINALS OF ECU [12/2019 - 11/2023]

Refer to TERMINALS OF ECU [12/2019 - 11/2023]