Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Reverse Signal Circuit

Lexus RX (RX 350L, RX450h) 2016-2026 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

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