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

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 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
  • 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
  • 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

Click here

COMBINATION METER ASSEMBLY

Click here

    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of ...

    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) Intelligent clearance sonar system data and Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Rear Combination Light Assembly (w/o Rear No. 2 Seat): Inspection
    INSPECTION PROCEDURE 1. INSPECT REAR COMBINATION LIGHT ASSEMBLY LH (a) Apply battery voltage to the rear combination light assembly LH and check that the lights come on. OK: Condition Specified Condition Battery positive (+) → Terminal 1 (B) Battery negative (-) → Terminal 3 (E) T ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Audio And Visual System (for 12.3 Inch Display): CD/DVD Sound Skips
    CAUTION / NOTICE / HINT NOTICE: Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System. Click here PROCEDURE 1. CHECK DISC (a) Check that th ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2025 Copyright www.lexusrx.net
    0.0151