Terminals Of Ecu [09/2022 - ]

Fig 1: Clearance Warning ECU Assembly Terminals Of ECU [09/2022 - ]

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the N41 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
   N41-1 (IG) - N41-28 (E)	IG power source signal	Ignition switch off	Below 1 V
   		Ignition switch ON	11 to 14 V
   N41-28 (E) - Body ground	Ground	Always	Below 1 Ω

3. Reconnect the N41 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
   N41-2 (BOF) - N41-28 (E)	Power source for front sensor circuit	Ignition switch off	Below 1 V
   		Ignition switch ON Parking support alert system on	11 to 14 V
   N41-3 (SOF) - N41-28 (E)	Front sensor communication signal (Front clearance sonar sensor)	Ignition switch ON Parking support alert system on Shift lever in any position other than P Vehicle speed is less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 1)
   N41-4 (E5) - N41-28 (E)	Ground for front clearance sonar	Always	Below 1 Ω
   N41-9 (CBZ) - N41-8 (EF)	No. 1 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)
   N41-19 (BOR) - N41-28 (E)	Power source for rear sensor circuit	Ignition switch off	Below 1 V
   		Ignition switch ON Parking support alert system on	11 to 14 V
   N41-20 (SOR) - N41-28 (E)	Rear sensor communication signal (Rear clearance sonar sensor)	Ignition switch ON Parking support alert system on Shift lever in R	Pulse generation (Refer to waveform 3)
   N41-21 (E1) - N41-28 (E)	Ground for rear clearance sonar	Always	Below 1 Ω
   N41-25 (BBZ) - N41-26 (ER)	No. 2 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)

5. Using an oscilloscope, check waveform 1.
   1. Waveform 1 (Reference)
      Fig 2: Waveform 1 [09/2022 - ]

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Measurement terminal	N41-3 (SOF) - N41-28 (E)
      Measurement setting	5 V/DIV., 1 ms./DIV.
      Condition	Ignition switch ON Parking support alert system on Shift lever in any position other than P Vehicle speed is less than approximately 10 km/h (6 mph)

6. Using an oscilloscope, check waveform 2.
   1. Waveform 2 (Reference)
      Fig 3: Waveform 2 [09/2022 - ]

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Measurement terminal	N41-9 (CBZ) - N41-8 (EF) N41-25 (BBZ) - N41-26 (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)
      Fig 4: Waveform 3 [09/2022 - ]

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Item	Content
      Measurement terminal	N41-20 (SOR) - N41-28 (E)
      Measurement setting	5 V/DIV., 1 ms./DIV.
      Condition	Ignition switch ON Parking support alert system on Shift lever in R

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