RM3660EC _56 Audio / Visual / Telematics _080754 PARK ASSIST / MONITORING _0470653 TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/ Parking Support Brake System) U

PARK ASSIST / MONITORING TOYOTA PARKING ASSIST-SENSOR SYSTEM(w/ Parking Support Brake System) TERMINALS OF ECU

CLEARANCE WARNING ECU ASSEMBLY

3.375,0.219 3.74,0.458 0.365,0.24 3.458,0.25 3.917,0.448 0.458,0.198 10 false I24

Disconnect the I24 clearance warning ECU assembly connector.

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
I24-1 (IG) - I24-31 (E)	IG power source signal	Ignition switch off	Below 1 V
I24-1 (IG) - I24-31 (E)	IG power source signal	Ignition switch ON	11 to 14 V
I24-31 (E) - Body ground	Ground	Always	Below 1 Ω

Reconnect the I24 clearance warning ECU assembly connector.

Measure the voltage and resistance check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
I24-2 (BOF) - I24-31 (E)	Power source for front sensor circuit	Ignition switch off	Below 1 V
I24-2 (BOF) - I24-31 (E)	Power source for front sensor circuit	· Ignition switch ON · TOYOTA parking assist-sensor system on	11 to 14 V
I24-3 (E5) - I24-31 (E)	Ground for front clearance sonar	Always	Below 1 Ω
I24-4 (SOF) - I24-31 (E)	Front sensor communication signal (Front clearance sonar sensor)	· Ignition switch ON · TOYOTA parking assist-sensor 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)
I24-19 (BOR) - I24-31 (E)	Power source for rear sensor circuit	Ignition switch off	Below 1 V
I24-19 (BOR) - I24-31 (E)	Power source for rear sensor circuit	· Ignition switch ON · TOYOTA parking assist-sensor system on	11 to 14 V
I24-20 (E1) - I24-31 (E)	Ground for rear clearance sonar	Always	Below 1 Ω
I24-21 (SOR) - I24-31 (E)	Rear sensor communication signal (Rear clearance sonar sensor)	· Ignition switch ON · TOYOTA parking assist-sensor system on · Shift lever in R · Vehicle speed is less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 1)

Using an oscilloscope, check waveform 1.

0.188,0.927 0.625,1.146 0.438,0.219 10 false GND 0.188,1.542 0.719,1.792 0.531,0.25 10 false GND 0.052,0.604 0.458,0.771 0.406,0.167 10 false CH1 0.052,1.229 0.458,1.396 0.406,0.167 10 false CH2

Waveform 1 (Reference)

Item	Content
Measurement terminal	· CH1: I24-4 (SOF) - I24-31 (E) · CH2: I24-21 (SOR) - I24-31 (E)
Measurement setting	5 V/DIV., 1 ms./DIV.
Condition	· Ignition switch ON · TOYOTA parking assist-sensor system on · Shift lever in any position other than P or R (CH1) · Shift lever in R (CH2) · Vehicle speed is less than approximately 10 km/h (6 mph)

HINT:: The waveforms for CH1 and CH2 are same.