LEXUS PARKING ASSIST-SENSOR SYSTEM TERMINALS OF ECU

CLEARANCE WARNING ECU ASSEMBLY

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
H61-1 (S1) - H61-2 (E1)	R - G	Sensor communication signal (Rear right sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in R	Pulse generation (See waveform 2)
H61-2 (E1) - H61-27 (E)	G - W-B	Ground for clearance sonar (Rear right sensor)	Always	Below 1 V
H61-3 (S2) - H61-4 (E2)	V - P	Sensor communication signal (Rear left sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in R	Pulse generation (See waveform 2)
H61-4 (E2) - H61-27 (E)	P - W-B	Ground for clearance sonar (Rear left sensor)	Always	Below 1 V
H61-6 (S3) - H61-7 (E3)	L - G	Sensor communication signal (Rear right center sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in R	Pulse generation (See waveform 2)
H61-7 (E3) - H61-27 (E)	G - W-B	Ground for clearance sonar (Rear right center sensor)	Always	Below 1 V
H61-8 (S4) - H61-9 (E4)	P - W	Sensor communication signal (Rear left center sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in R	Pulse generation (See waveform 2)
H61-9 (E4) - H61-27 (E)	W - W-B	Ground for clearance sonar (Rear left center sensor)	Always	Below 1 V
H61-11 (CBZ) - H61-10 (EF)	W - B	Clearance warning buzzer signal	Buzzer sounding	Pulse generation (See waveform 1)
H61-12 (IG) - H61-27 (E)	V - W-B	IG power source signal	Engine switch off	Below 1 V
H61-12 (IG) - H61-27 (E)	V - W-B	IG power source signal	Engine switch on (IG)	11 to 14 V
H61-17 (R1)	P	CAN communication signal	-	-
H61-18 (R2)	W	CAN communication signal	-	-
H61-19 (S5) - H61-20 (E5)	B - W	Sensor communication signal (Front right sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in R	Pulse generation (See waveform 2)
H61-19 (S5) - H61-20 (E5)	B - W	Sensor communication signal (Front right sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in any position other than P or R. Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing	Pulse generation (See waveform 2)
H61-20 (E5) - H61-27 (E)	W - W-B	Ground for clearance sonar (Front right sensor)	Always	Below 1 V
H61-21 (S6) - H61-22 (E6)	P - V	Sensor communication signal (Front left sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in R	Pulse generation (See waveform 2)
H61-21 (S6) - H61-22 (E6)	P - V	Sensor communication signal (Front left sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in any position other than P or R. Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing	Pulse generation (See waveform 2)
H61-22 (E6) - H61-27 (E)	V - W-B	Ground for clearance sonar (Front left sensor)	Always	Below 1 V
H61-23 (S7) - H61-24 (E7)	R - G	Sensor communication signal (Front right center sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in any position other than P or R. Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing	Pulse generation (See waveform 2)
H61-24 (E7) - H61-27 (E)	G - W-B	Ground for clearance sonar (Front right center sensor)	Always	Below 1 V
H61-25 (S8) - H61-26 (E8)	L - Y	Sensor communication signal (Front left center sensor)	Engine switch on (IG) Clearance sonar main switch on Shift lever in any position other than P or R. Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing	Pulse generation (See waveform 2)
H61-26 (E8) - H61-27 (E)	Y - W-B	Ground for clearance sonar (Front left center sensor)	Always	Below 1 V
H61-27 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 V
H61-38 (CLSW) - H61-27 (E)	B - W-B	Clearance sonar main switch power source signal	Engine switch on (IG) Clearance sonar main switch on	11 to 14 V
H61-38 (CLSW) - H61-27 (E)	B - W-B	Clearance sonar main switch power source signal	Engine switch on (IG) Clearance sonar main switch off	Below 1 V

Using an oscilloscope, check waveform 1.

Waveform 1 (Reference)

Item	Content
Terminal No. (Symbol)	H61-11 (CBZ) - H61-10 (EF)
Tool Setting	2 V/DIV., 100 μsec./DIV.
Condition	Buzzer sounding

Tech Tips

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

Using an oscilloscope, check waveform 2.

Waveform 2 (Reference)

Item	Content
Terminal No. (Symbol)	H61-1 (S1) - H61-2 (E1) H61-3 (S2) - H61-4 (E2) H61-6 (S3) - H61-7 (E3) H61-8 (S4) - H61-9 (E4)
Tool Setting	2 V/DIV., 100 μsec./DIV.
Condition	Engine switch on (IG) Clearance sonar main switch on Shift lever in R

Item

Content

Terminal No. (Symbol)

H61-1 (S1) - H61-2 (E1)

H61-3 (S2) - H61-4 (E2)

H61-6 (S3) - H61-7 (E3)

H61-8 (S4) - H61-9 (E4)

Tool Setting

2 V/DIV., 100 μsec./DIV.

Condition

Engine switch on (IG)

Clearance sonar main switch on

Shift lever in R

Item	Content
Terminal No. (Symbol)	H61-19 (S5) - H61-20 (E5) H61-21 (S6) - H61-22 (E6)
Tool Setting	2 V/DIV., 100 μsec./DIV.
Condition	Engine switch on (IG) Clearance sonar main switch on Shift lever in R
Condition	Engine switch on (IG) Clearance sonar main switch on Shift lever in any position other than P or R. Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing

Item	Content
Terminal No. (Symbol)	H61-23 (S7) - H61-24 (E7) H61-25 (S8) - H61-26 (E8)
Tool Setting	2 V/DIV., 100 μsec./DIV.
Condition	Engine switch on (IG) Clearance sonar main switch on Shift lever in any position other than P or R. Less than approximately 15 km/h (9.3 mph) if vehicle speed is increasing Less than approximately 10 km/h (6.2 mph) if vehicle speed is decreasing