Lexus NX: Terminals Of Ecu

Lexus NX Service Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Intuitive Parking Assist System (w/ Intelligent Clearance Sonar System) / Terminals Of Ecu

TERMINALS OF ECU

CLEARANCE WARNING ECU ASSEMBLY

(a) Disconnect the I20 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
I20-1 (IG) - I20-30 (E)	BE - W-B	IG power source signal	Power switch off	Below 1 V
I20-1 (IG) - I20-30 (E)	BE - W-B	IG power source signal	Power switch on (IG)	11 to 14 V
I20-30 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
I20-4 (BOF) - I20-30 (E)	R - W-B	Power source for front sensor circuit	Power switch off	Below 1 V
I20-4 (BOF) - I20-30 (E)	R - W-B	Power source for front sensor circuit	Power switch on (IG) Intuitive parking assist system on	11 to 14 V
I20-6 (E5) - I20-30 (E)	LG - W-B	Ground for front clearance sonar	Always	Below 1 Ω
I20-8 (SOF) - I20-30 (E)	V - W-B	Front sensor communication signal (Front clearance sonar sensor)	Power switch on (IG) Intuitive parking assist 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)
I20-14 (CBZ) - I20-13 (EF)	LG - L	No. 1 clearance warning buzzer signal	Buzzer sounding	Pulse generation (Refer to waveform 2)
I20-15 (BBZ) - I20-16 (ER)	SB - P	No. 2 clearance warning buzzer signal	Buzzer sounding	(Refer to waveform 2)
I20-22 (BOR) - I20-30 (E)	SB - W-B	Power source for rear sensor circuit	Power switch off	Below 1 V
I20-22 (BOR) - I20-30 (E)	SB - W-B	Power source for rear sensor circuit	Power switch on (IG) Intuitive parking assist system on	11 to 14 V
I20-23 (E1) - I20-30 (E)	L - W-B	Ground for rear clearance sonar	Always	Below 1 Ω
I20-24 (SOR) - I20-30 (E)	R - W-B	Rear sensor communication signal (Rear clearance sonar sensor)	Power switch on (IG) Intuitive parking assist system on Shift lever in R Vehicle speed is less than approximately 10 km/h (6 mph)	Pulse generation (Refer to waveform 1)
I20-28 (STP) - I20-30 (E)*	R - W-B	Reverse signal input	Power switch on (IG) Shift lever in R	11 to 14 V
I20-28 (STP) - I20-30 (E)*	R - W-B	Reverse signal input	Power switch on (IG) Shift lever not in R	Below 1 V
I20-31 (IND) - I20-30 (E)*	V - W-B	Reverse signal output	Power switch on (IG) Shift lever in R	Below 3 V
I20-31 (IND) - I20-30 (E)*	V - W-B	Reverse signal output	Power switch on (IG) Shift lever not in R	8 V or higher

*: for 10.3 Inch Display and w/ Parking Assist Monitor System

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)

Item	Content
Measurement terminal	CH1: I20-8 (SOF) - I20-30 (E) CH2: I20-24 (SOR) - I20-30 (E)
Measurement setting	5 V/DIV., 1 ms./DIV.
Condition	Power switch on (IG) Intuitive parking assist 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.

(f) Using an oscilloscope, check waveform 2.

(1) Waveform 2 (Reference)

Item	Content
Measurement terminal	I20-14 (CBZ) - I20-13 (EF) I20-15 (BBZ) - I20-16 (ER)
Measurement setting	2 V/DIV., 500 μs./DIV.
Condition	Buzzer sounding

Item

Content

Measurement terminal

I20-14 (CBZ) - I20-13 (EF)

I20-15 (BBZ) - I20-16 (ER)

Measurement setting

2 V/DIV., 500 μs./DIV.

Condition

Buzzer sounding

HINT:

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

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