Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Communication Error From Clearance Sonar ECU to VSC (C164B)

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Intelligent Clearance Sonar System / Communication Error From Clearance Sonar ECU to VSC (C164B)

DESCRIPTION

The vehicle stability control system receives intelligent clearance sonar system information from the clearance warning ECU assembly via CAN communication. When it is determined that there is a communication error between the skid control ECU and clearance warning ECU assembly, DTC C164B is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C164B

Communication Error From Clearance Sonar ECU to VSC

A communication error between the skid control ECU and clearance warning ECU assembly is detected
  • Clearance warning ECU assembly
  • Vehicle stability control system
  • Brake actuator assembly (skid control ECU)

CAUTION / NOTICE / HINT

NOTICE:

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • After replacing an ultrasonic sensor or the clearance warning ECU assembly, perform the necessary procedures (adjustment, calibration, initialization or registration).

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT

(a) Using the Techstream, check for DTCs according to the prompts on the screen.

Click here

HINT:

After turning the engine switch from off to on (IG), wait 4 seconds or more before checking for DTCs.

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

(b) Clear the DTCs according to the screen on the Techstream.

Click here

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs

(c) Recheck for DTCs.

Click here

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

HINT:

  • If DTC C164B is not output after clearing the DTCs, an intermittent communication error between the clearance warning ECU assembly and skid control ECU is suspected.
  • If DTC C164B is output frequently, duplicate the conditions that cause the problem symptoms and perform the inspection again, even though the DTC was not output when rechecking for DTCs.

    Click here

Result

Proceed to

DTC C164B is output

A

DTC C164B is not output

B
B

USE SIMULATION METHOD TO CHECK

A

2.

CHECK DTC OUTPUT (VEHICLE STABILITY CONTROL SYSTEM)

(a) Using the Techstream, check for DTCs according to the prompts on the screen.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B
B

GO TO VEHICLE STABILITY CONTROL SYSTEM

A

3.

REPLACE CLEARANCE WARNING ECU ASSEMBLY

(a) Replace the clearance warning ECU assembly with a known good one.

Click here

NEXT

4.

CHECK DTC OUTPUT

(a) Using the Techstream, check for DTCs according to the prompts on the screen.

Click here

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

(b) Clear the DTCs according to the screen on the Techstream.

Click here

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Clear DTCs

(c) Recheck for DTCs.

Click here

Body Electrical > Advanced Parking Guidance/ICS/Intuitive P/A > Trouble Codes

Result

Proceed to

DTC C164B is output

A

DTC C164B is not output

B
A

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

B

END (CLEARANCE WARNING ECU ASSEMBLY DEFECTIVE)
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