Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Intelligent Clearance Sonar System / Terminals Of Ecu

TERMINALS OF ECU

CLEARANCE WARNING ECU ASSEMBLY

(a) Disconnect the J38 clearance warning ECU assembly connector.

(b) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J38-1 (IG) - J38-30 (E)	SB - W-B	IG power source signal	Engine switch off	Below 1 V
J38-1 (IG) - J38-30 (E)	SB - W-B	IG power source signal	Engine switch on (IG)	11 to 14 V
J38-30 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
J38-4 (BOF) - J38-30 (E)	P - W-B	Power source for front sensor circuit	Engine switch off	Below 1 V
J38-4 (BOF) - J38-30 (E)	P - W-B	Power source for front sensor circuit	Engine switch on (IG) Intelligent clearance sonar system on	11 to 14 V
J38-6 (E5) - J38-30 (E)	L - W-B	Ground for front clearance sonar	Always	Below 1 Ω
J38-8 (SOF) - J38-30 (E)	B - W-B	Front sensor communication signal (Front clearance sonar sensor)	Engine switch on (IG) Intelligent clearance sonar 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)
J38-14 (CBZ) - J38-13 (EF)	Y - P	No. 1 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)
J38-15 (BBZ) - J38-16 (ER)	R - W	No. 2 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)
J38-22 (BOR) - J38-30 (E)	LG - W-B	Power source for rear sensor circuit	Engine switch off	Below 1 V
J38-22 (BOR) - J38-30 (E)	LG - W-B	Power source for rear sensor circuit	Engine switch on (IG) Intelligent clearance sonar system on	11 to 14 V
J38-23 (E1) - J38-30 (E)	GR - W-B	Ground for rear clearance sonar	Always	Below 1 Ω
J38-24 (SOR) - J38-30 (E)	SB - W-B	Rear sensor communication signal (Rear clearance sonar sensor)	Engine switch on (IG) Intelligent clearance sonar system on Shift lever in R Vehicle speed is less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 3)

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)

Item	Content
Measurement terminal	J38-8 (SOF) - J38-30 (E)
Measurement setting	5 V/DIV., 1 ms./DIV.
Condition	Engine switch on (IG) Intelligent clearance sonar system on Shift lever in any position other than P or R Vehicle speed is less than approximately 10 km/h (6 mph)

(f) Using an oscilloscope, check waveform 2.

(1) Waveform 2 (Reference)

Item	Content
Measurement terminal	J38-14 (CBZ) - J38-13 (EF) J38-15 (BBZ) - J38-16 (ER)
Measurement setting	2 V/DIV., 500 μs./DIV.
Condition	Buzzer sounding

HINT:

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

(g) Using an oscilloscope, check waveform 3.

(1) Waveform 3 (Reference)

Item	Content
Measurement terminal	J38-24 (SOR) - J38-30 (E)
Measurement setting	5 V/DIV., 1 ms./DIV.
Condition	Engine switch on (IG) Intelligent clearance sonar system on Shift lever in R Vehicle speed is less than approximately 10 km/h (6 mph)

ECM

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