Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Reverse Signal Circuit

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Parking Assist Monitor System / Reverse Signal Circuit

DESCRIPTION

The multi-display assembly receives a reverse signal from the park/neutral position switch assembly*1 or clearance warning ECU assembly*2.

*1: except 12.3 Inch Display and w/ Intuitive Parking Assist System

*2: for 12.3 Inch Display and w/ Intuitive Parking Assist System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When "!" mark is displayed on the multi-display assembly after disconnecting the cable from the negative (-) battery terminal, correct the steering angle neutral point.

    Click here

  • Depending on the parts that are replaced or operations that are performed during vehicle inspection or maintenance, calibration of other systems as well as the parking assist monitor system may be needed.

    Click here

PROCEDURE

1.

CHECK BACK-UP LIGHT

(a) Check that the back-up light comes on.

OK:

The back-up light comes on.

Result

Proceed to

OK (except 12.3 Inch Display and w/ Intuitive Parking Assist System)

A

OK (for 12.3 Inch Display and w/ Intuitive Parking Assist System)

B

NG

C
B

GO TO STEP 3

C

GO TO LIGHTING SYSTEM (EXT)

A

2.

CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL)

(a) Disconnect the J56 multi-display assembly connector.

*a

Front view of wire harness connector

(to Multi-display Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

J56-3 (REV) - Body ground

Engine switch on (IG)

Shift position in R

11 to 14 V

J56-3 (REV) - Body ground

Engine switch on (IG)

Shift position not in R

Below 1 V
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL)

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

*a

Front view of wire harness connector

(to Clearance Warning ECU Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

J38-28 (STP) - Body ground

Engine switch on (IG)

Shift position in R

11 to 14 V

J38-28 (STP) - Body ground

Engine switch on (IG)

Shift position not in R

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - MULTI-DISPLAY ASSEMBLY)

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

(b) Disconnect the J56 multi-display assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

J38-31 (IND) - J56-14 (CSWA)

Always

Below 1 Ω

J38-31 (IND) or J56-14 (CSWA) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT CLEARANCE WARNING ECU ASSEMBLY

(a) Disconnect the multi-display assembly connector.

*a

Component with harness connected

(Clearance Warning ECU Assembly)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

J38-31 (IND) - Body ground

Engine switch on (IG)

Shift position in R

Below 3 V

J38-31 (IND) - Body ground

Engine switch on (IG)

Shift position not in R

8 V or higher
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE CLEARANCE WARNING ECU ASSEMBLY

    Image from Camera for Parking Assist Monitor is Abnormal
    DESCRIPTION The video signal from the rear television camera assembly is transmitted to the multi-display assembly. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: When "!" mark is displayed on the ...

    Rear Crossing Traffic Alert Buzzer (w/ Rear No. 2 Seat)
    ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Blind Spot Monitor System: Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) Blind spot monitor data and Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and to perform repairs. CHECK DLC3 (a) Check the DLC ...

    Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Instrument Panel Safety Pad: Removal
    REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during instrument panel safety pad removal/installation are shown below. Necessary Procedures After Parts Remov ...

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

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

    © 2025 Copyright www.lexusrx.net
    0.0191