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

Lexus NX Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Lost Communication with Cruise Control Front Distance Range Sensor Missing Message (U023587)

DESCRIPTION

The forward recognition camera is connected to the millimeter wave radar sensor assembly via the CAN communication line. When the signal from the millimeter wave radar sensor assembly is interrupted, the forward recognition camera outputs U023587.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U023587

Lost Communication with Cruise Control Front Distance Range Sensor Missing Message

Once 3 seconds elapse after turning the power switch on (IG), a communication malfunction between the millimeter wave radar sensor assembly continues for approximately 2 seconds or more.

  • Local bus (Open or short)
  • Forward recognition camera
  • Millimeter wave radar sensor assembly

Pattern

DTC Location Name

( Techstream Displayed Name)

Suspected Area (Malfunction Status)

Forward recognition camera

(Pre-Collision System)

Millimeter wave radar sensor assembly

(Front Radar Sensor)

U023587

U010487

○: DTC is stored

-: DTC is not stored

Pattern 1

  • Open in CAN communication line (forward recognition camera - CAN junction connector)
  • Open in CAN communication line (millimeter wave radar sensor assembly - CAN junction connector)
  • CAN junction connector disconnected
  • CAN junction connector
  • Short in CAN communication line
  • Open or short in forward recognition camera internal circuit
  • Open or short in millimeter wave radar sensor assembly internal circuit

Pattern 2

-

  • Millimeter wave radar sensor assembly connector disconnected
  • Millimeter wave radar sensor assembly power supply circuit malfunction
  • Millimeter wave radar sensor assembly internal malfunction
  • Forward recognition camera internal malfunction

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.

    Click here

  • 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 and a DTC may be stored.
  • When the millimeter wave radar sensor assembly is replaced with a new one, adjustment of the millimeter wave radar sensor beam axis must be performed.

    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 and a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, forward recognition camera adjustment must be performed.

    HINT:

    Forward recognition camera adjustment can be performed by using either One Time Recognition or Sequential Recognition.

    One Time Recognition:

    Click here

    Sequential Recognition:

    Click here

PROCEDURE

1.

CHECK FOR DTC

(a) Read each DTC and check the diagnosis pattern using the table below.

Front Radar Sensor: Click here

Pre-Collision System: Click here

Body Electrical > Front Radar Sensor > Trouble Codes Body Electrical > Pre-Collision System > Trouble Codes

Pattern

Display on Techstream / Output DTC

Millimeter Wave Radar Sensor Assembly

(Front Radar Sensor)

Forward Recognition Camera

(Pre-Collision System)

Pattern 1

U010487

U023587

Pattern 2

U010487

-

Result

Proceed to

Pattern 1

A

Pattern 2

B

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

A

2.

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

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

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

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

*b

DLC3

(c) 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

GO TO STEP 4

OK

3.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Front Radar Sensor > Clear DTCs

(c) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(d) Recheck for DTCs and check that no DTCs are output.

Click here

Body Electrical > Front Radar Sensor > Trouble Codes

OK:

DTC U010487 is not output.

OK

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

NG

REPLACE FORWARD RECOGNITION CAMERA

4.

CHECK CAN MAIN WIRE (FORWARD RECOGNITION CAMERA CAN MAIN WIRE)

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

(b) Disconnect the T18 forward recognition camera connector.

*a

Front view of wire harness connector

(to Forward Recognition Camera)

*b

DLC3

(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

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

OK

5.

CHECK MILLIMETER WAVE RADAR SENSOR ASSEMBLY

(a) Replace the millimeter wave radar sensor assembly.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > Front Radar Sensor > Clear DTCs

(c) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(d) Recheck for DTCs and check that no DTCs are output.

Click here

Body Electrical > Front Radar Sensor > Trouble Codes

OK:

DTC U010487 is not output.

OK

END (MILLIMETER WAVE RADAR SENSOR ASSEMBLY WAS DEFECTIVE)

NG

REPLACE FORWARD RECOGNITION CAMERA

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