Lexus ES manuals

Lexus ES: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.
General

Symptom

Suspected Area

Link

System does not operate at all

Parking support alert system

CAN communication system

Clearance warning ECU assembly

Steering pad switch assembly

Blind spot monitor system*1

Panoramic view monitor system*2

Sonar Function

Symptom

Suspected Area

Link

Detection function operates when the operating conditions are not met

Hybrid control system

Skid control ECU

Clearance warning ECU assembly

Detection function operates when vehicle is not within the required speed range (speedometer not malfunctioning)

CAN communication system

Skid control ECU

Clearance warning ECU assembly

Buzzer Function

Symptom

Suspected Area

Link

Parking support brake system is normal but buzzer operation is intermittent

Check that the temporary mute function is not operating

-

Proceed to "No. 1 Clearance Warning Buzzer Circuit"

Proceed to "No. 2 Clearance Warning Buzzer Circuit"

Clearance warning ECU assembly

Combination meter assembly

Display Function

Symptom

Suspected Area

Link

While the parking support brake system is operating, no parking support brake notifications are displayed on the multi-information display.

CAN communication system

Clearance warning ECU assembly

Combination meter assembly

While the parking support brake system is operating, no parking support brake notifications are displayed on the headup display.*3

CAN communication system

Clearance warning ECU assembly

Meter mirror sub-assembly

"Parking Support Brake Malfunction Visit Your Dealer" is displayed

Combination meter assembly

Clearance warning ECU assembly

"Parking Support Brake Unavailable" is displayed

Check that no foreign matter is attached to the ultrasonic sensors.

-

Steering angle neutral point (Parking support brake system registration)

CAN communication system

Combination meter assembly

Clearance warning ECU assembly

Parking support brake system does not operate when there is a possibility of a collision (Warning message "Parking Support Brake Unavailable" not displayed)

Check the installation of the ultrasonic sensors (front)

Check the installation of the ultrasonic sensors (rear)

Adjust the installation of the ultrasonic sensors as necessary.

Ultrasonic sensors (front)

Ultrasonic sensors (rear)

Clearance warning ECU assembly

Parking support brake system control operates when there is no possibility of a collision

Check the installation of the ultrasonic sensors (front)

Check the installation of the ultrasonic sensors (rear)

Adjust the installation of the ultrasonic sensors as necessary.

Ultrasonic sensors (front)

Ultrasonic sensors (rear)

Clearance warning ECU assembly

Parking support brake system control cannot be turned off (PKSB OFF indicator does not illuminate)

Combination meter assembly (LED): Perform Active Test (Indicat. PKSB OFF LCD)

Steering pad switch assembly

Clearance warning ECU assembly

PKSB OFF indicator blinks

If "Yes" is displayed for the Data List item "BSM Radar Communication Invalid History", the blind spot monitor system may be malfunctioning.

Check that no foreign matter is attached to the ultrasonic sensors.

-

Steering angle neutral point (Parking support brake system registration)

  • *1: w/ Blind spot monitor system
  • *2: w/ Panoramic View Monitor System
  • *3: w/ Headup Display System

READ NEXT:

 System Description

SYSTEM DESCRIPTION FUNCTION OF COMPONENTS (a) The parking support brake system consists of the following components: Component Function Clearance Warning ECU Assembly Sends the drive for

 System Diagram

SYSTEM DIAGRAM w/ Blind Spot Monitor System w/ Panoramic View Monitor System

 Terminals Of Ecu

TERMINALS OF ECU CLEARANCE WARNING ECU ASSEMBLY (a) Disconnect the N41 clearance warning ECU assembly connector. (b) Measure the voltage and resistance on the wire harness side connector according to

SEE MORE:

 Back Camera Power Supply Failure (C1621)

DESCRIPTION This DTC is stored if the rear television camera assembly judges as a result of its self check that the signals or signal lines between the rear television camera assembly and parking assist ECU are not normal. DTC No. Detection Item DTC Detection Condition Trouble Area C162

 Touch Pad Memory Module Malfunction (B155B)

DESCRIPTION This DTC is stored if the remote touch (remote operation controller assembly) detects a malfunction in itself, such as internal hardware failure or remote touch screen memory module malfunction. DTC No. Detection Item DTC Detection Condition Trouble Area B155B Touch Pad Me

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