Lexus NX: Reverse Signal Circuit

DESCRIPTION

The multi-display receives a reverse signal from the BK UP LP relay*1 or clearance warning ECU assembly*2.

*1: except 10.3 Inch Display and w/ Intuitive Parking Assist System

*2: for 10.3 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 (-) auxiliary 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 10.3 Inch Display and w/ Intuitive Parking Assist System)

A

OK (for 10.3 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 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

I42-3 (REV) - Body ground

Power switch on (IG)

Shift position in R

11 to 14 V

I42-3 (REV) - Body ground

Power 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 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

I20-28 (STP) - Body ground

Power switch on (IG)

Shift position in R

11 to 14 V

I20-28 (STP) - Body ground

Power 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 I20 clearance warning ECU assembly connector.

(b) Disconnect the I42 multi-display assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

I20-31 (IND) - I42-14 (CSWA)

Always

Below 1 Ω

I20-31 (IND) or I42-14 (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

I20-31 (IND) - Body ground

Power switch on (IG)

Shift position in R

Below 3 V

I20-31 (IND) - Body ground

Power 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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