Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: 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

Engine switch on (IG)

11 to 14 V

J38-30 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the J38 clearance warning ECU assembly connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

*: for 12.3 Inch Display with Parking Assist Monitor System

J38-4 (BOF) - J38-30 (E)

P - W-B

Power source for front sensor circuit

Engine switch off

Below 1 V

  • Engine switch on (IG)
  • Intuitive parking assist 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)
  • 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)

J38-14 (CBZ) - J38-13 (EF)

Y - P

Clearance warning buzzer signal

Buzzer sounding

Pulse generation

(Refer to waveform 2)

J38-15 (BBZ) - J38-16 (ER)

R - W

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

  • Engine switch on (IG)
  • Intuitive parking assist 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)
  • 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)

J38-28 (STP) - J38-30 (E)*

V - W-B

Reverse signal input

  • Engine switch on (IG)
  • Shift lever in R

11 to 14 V

  • Engine switch on (IG)
  • Shift lever not in R

Below 1 V

J38-31 (IND) - J38-30 (E)*

R - W-B

Reverse signal output

  • Engine switch on (IG)
  • Shift lever in R

Below 3 V

  • Engine switch on (IG)
  • Shift lever not in R

8 V or higher

(e) Using an oscilloscope, check waveform 1.

(1) Waveform 1 (Reference)

Item

Content

Measurement terminal

  • CH1: J38-8 (SOF) - J38-30 (E)
  • CH2: J38-24 (SOR) - J38-30 (E)

Measurement setting

5 V/DIV., 1 ms./DIV.

Condition

  • Engine 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

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.

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