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.
| 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 | |
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| 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 | |
| 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 | |
| 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
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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:
Inspection
INSPECTION PROCEDURE 1. INSPECT TURN SIGNAL SWITCH (a) Measure the resistance according to the value(s) in the table below. Standard Resistance: Light Control Switch Tester Connection Condition Specified Condition
*1: w/ Light Control Switch DRL OFF Position
2 (L_OFF) - 12 (EL)
Poor Sound Quality in All Modes (Low Volume)
PROCEDURE 1. CHECK AUDIO SETTINGS (a) Set treble, middle and bass to the initial values and check that the sound is normal. OK: The sound returns to normal. HINT: Sound quality adjustment measures vary according to the type of amplifier. OK END
NG 2. COMPARE
