Lexus NX: Lost Communication with Cruise Control Front Distance Range Sensor Missing Message (U023587)

Lexus NX Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System (for Single Beam Headlight) / Lost Communication with Cruise Control Front Distance Range Sensor Missing Message (U023587)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Note

U023587

Lost Communication with Cruise Control Front Distance Range Sensor Missing Message

  • The power switch is on (IG)
  • A communication malfunction with the millimeter wave radar sensor assembly is detected
  • 5 seconds or more
  • Local bus (Open or short)
  • Forward recognition camera
  • Millimeter wave radar sensor assembly

Front Recognition Camera (Front Lighting Control)

-

Pattern

DTC output part name

(Display on Techstream)

Suspected Area (Malfunction Status)

Forward Recognition Camera

(Front Recognition Camera(Front Light Control))

U023587

○: DTC is output

-: DTC is not output

Pattern 1

Local bus (Open or short)

Millimeter wave radar sensor assembly (Internal malfunction)

Forward recognition camera (Internal malfunction)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
  • When the millimeter wave radar sensor assembly has been replaced with a new one, it is necessary to perform millimeter wave radar sensor assembly adjustment and front radar acceleration sensor calibration, and to clear the vehicle control history.

    Click here

  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

    for sequential recognition: Click here

    for one time recognition: Click here

  • After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here

  • When disconnecting and reconnecting the auxiliary battery

    Click here

    HINT:

    When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here

PROCEDURE

1.

CHECK CAN BUS WIRE (FORWARD RECOGNITION CAMERA MAIN WIRE)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the T18 forward recognition camera connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T18-6 (CANH) - T18-12 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

T18-6 (CANH) - I182-4 (CG)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

T18-12 (CANL) - I182-4 (CG)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

T18-6 (CANH) - I182-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

T18-12 (CANL) - I182-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

NG

GO TO STEP 5

OK

2.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Temporarily replace the millimeter wave radar sensor assembly with a new one.

Click here

NEXT

3.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Front Recognition Camera (Front Lighting Control) / Clear DTCs.

(e) Clear the DTCs.

Body Electrical > Front Recognition Camera (Front Lighting Control) > Clear DTCs
NEXT

4.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Wait 5 seconds or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Front Recognition Camera (Front Lighting Control) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > Front Recognition Camera (Front Lighting Control) > Trouble Codes

OK:

DTC U023587 is not output.

OK

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY IS DEFECTIVE)

NG

REPLACE FORWARD RECOGNITION CAMERA

5.

CHECK CAN BUS WIRE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY MAIN WIRE)

(a) Disconnect the B10 millimeter wave radar sensor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B10-5 (CA1P) - B10-6 (CA1N)

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

B10-5 (CA1P) - I182-4 (CG)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

B10-6 (CA1N) - I182-4 (CG)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

B10-5 (CA1P) - I182-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

B10-6 (CA1N) - I182-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

NG

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR

OK

6.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Temporarily replace the millimeter wave radar sensor assembly with a new one.

Click here

NEXT

7.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Front Recognition Camera (Front Lighting Control) / Clear DTCs.

(e) Clear the DTCs.

Body Electrical > Front Recognition Camera (Front Lighting Control) > Clear DTCs
NEXT

8.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Wait 5 seconds or more.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Front Recognition Camera (Front Lighting Control) / Trouble Codes.

(f) Check for DTCs.

Body Electrical > Front Recognition Camera (Front Lighting Control) > Trouble Codes

OK:

DTC U023587 is not output.

OK

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY IS DEFECTIVE)

NG

REPLACE FORWARD RECOGNITION CAMERA

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