Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: "CHK" message(s) are displayed on the SIGNAL CHECK screen.

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Panoramic View Monitor System / "CHK" message(s) are displayed on the SIGNAL CHECK screen.

DESCRIPTION

On the SIGNAL CHECK screen, it is possible to check if the signals sent to the parking assist ECU are normal.

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HINT:

  • On the SIGNAL CHECK screen, "OK" (blue) is displayed for items with a normal inspection result or input state.
  • On the SIGNAL CHECK screen, "CHK" (red) is displayed for items with an abnormal inspection result or input state.
  • Displayed items may differ depending on vehicle specifications.

Item

Signal Input Method

Detail

DTC Output when Abnormal Result is Displayed

Signal Receiver

CAN

CAN communication

CAN communication signal

DTC is output

Related ECUs

SHIFT

Vehicle wire harness

Shift position switch signal

DTC is not output

Park/neutral position switch assembly

CAMERA SW

Vehicle wire harness

Panoramic view monitor switch signal input state

DTC is not output

Panoramic view monitor switch (Integration control and panel assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

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  • 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 panoramic view monitor system may be needed.

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PROCEDURE

1.

CHECK DISPLAY CHECK MODE

(a) Check which items display on the signal check screen.

Result

Proceed to

"CAMERA SW" displays "CHK" (red)

A

"CAN" displays "CHK" (red)

B

"SHIFT" displays "CHK" (red)

C
B

GO TO CAN COMMUNICATION SYSTEM

C

GO TO STEP 4

A

2.

CHECK HARNESS AND CONNECTOR (PANORAMIC VIEW MONITOR SWITCH - PARKING ASSIST ECU AND BODY GROUND)

(a) Disconnect the J84 panoramic view monitor switch connector.

(b) Disconnect the J159 parking assist ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J159-15 (BLSW) - J84-5 (D)

Always

Below 1 Ω

J84-17 (E) - Body ground

Always

Below 1 Ω

J159-15 (BLSW) or J84-5 (D) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

INSPECT PANORAMIC VIEW MONITOR SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

(a) Remove the panoramic view monitor switch (integration control and panel assembly).

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(b) Inspect the panoramic view monitor switch (integration control and panel assembly).

Click here

OK

REPLACE PARKING ASSIST ECU

NG

REPLACE PANORAMIC VIEW MONITOR SWITCH (INTEGRATION CONTROL AND PANEL ASSEMBLY)

4.

CHECK BACK-UP LIGHT

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

OK:

The back-up light comes on.

NG

GO TO LIGHTING SYSTEM (EXT)

OK

5.

CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL)

(a) Disconnect the J159 parking assist ECU connector.

*a

Front view of wire harness connector

(to Parking Assist ECU)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

J159-14 (REV) - Body ground

Engine switch on (IG), shift position in R

11 to 14 V

J159-14 (REV) - Body ground

Engine switch on (IG), shift position not in R

Below 1 V
OK

REPLACE PARKING ASSIST ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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