Lexus ES: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
If there are no DTCs but the problem still occurs, check the suspected areas for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
Electronically Controlled Brake System| Symptom | Suspected Area | Link |
|---|---|---|
| ABS warning light abnormal (Remains on) | Refer to the procedure for "ABS Warning Light Remains ON" | |
| ABS warning light abnormal (Does not come on) | Refer to the procedure for "ABS Warning Light does not Come ON" | |
| Brake warning light / red (malfunction) abnormal (Remains on) | Refer to the procedure for "Brake Warning Light Remains ON" | |
| Brake warning light / red (malfunction) abnormal (Does not come on) | Refer to the procedure for "Brake Warning Light does not Come ON" | |
| Brake warning light / yellow (minor malfunction) abnormal (Remains on) | Refer to the procedure for "Brake Control Warning Light Remains ON" | |
| Brake warning light / yellow (minor malfunction) abnormal (Does not come on) | Refer to the procedure for "Brake Control Warning Light does not Come ON" | |
| Brake hold standby indicator light abnormal | Refer to the procedure for "Brake Hold Standby Indicator Light Circuit" | |
| Brake hold operated indicator light abnormal | Refer to the procedure for "Brake Hold Operated Indicator Light Circuit" | |
| Slip indicator light abnormal (Remains on) | Refer to the procedure for "Slip Indicator Light Remains ON" | |
| Slip indicator light abnormal (Does not come on) | Refer to the procedure for "Slip Indicator Light does not Come ON" | |
| TRAC does not operate | Refer to the procedure for "TRAC does not Operate" | |
| Excessive brake pedal travel (No fluid leaks and no air in system) | Refer to the procedure for "Excessive Brake Pedal Travel (No Fluid Leaks and No Air in System)" | |
| ABS does not operate | Refer to the procedure for "ABS does not Operate" | |
| ABS operates before necessary when braking | Refer to the procedure for "ABS Operates Before Necessary When Braking" | |
| VSC does not operate or VSC does not operate correctly | Refer to the procedure for "VSC does not Operate or VSC does not Operate Correctly" | |
| Abnormal brake pedal response on first depression | Refer to the procedure for "Abnormal Brake Pedal Response on First Depression" | |
| Brake actuator operation sound is loud during initial check | Refer to the procedure for "Brake Actuator Operation Sound is Loud during Initial Check" | |
| VSC OFF switch abnormal | Refer to the procedure for "VSC OFF Switch Circuit" | |
| Meter buzzer abnormal | Refer to Meter / Gauge system | |
| Abnormal Noise is Heard from the Engine Compartment when Depressing the Brake Pedal | Refer to the procedure for "Abnormal Noise is Heard from the Engine Compartment when Depressing the Brake Pedal" | |
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Slip Indicator Light does not Come ON
DESCRIPTION The skid control ECU (brake booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication. CAUTION / NOTICE / HINT NOTICE: After replacing the
Slip Indicator Light Remains ON
DESCRIPTION The skid control ECU (brake booster with master cylinder assembly) is connected to the combination meter assembly via CAN communication. If the skid control ECU (brake booster with master
System Diagram
SYSTEM DIAGRAM Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Skid control ECU (Brake booster with master cylinder assembly) Power steering ECU (Rack an
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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 suspect
Open in Master Reservoir Level Switch Circuit (C120F)
DESCRIPTION DTC No. Detection Item INF Code DTC Detection Condition Trouble Area MIL Note C120F Open in Master Reservoir Level Switch Circuit 371 The brake fluid level warning switch (brake booster with master cylinder assembly) circuit is open for 2 seconds or more.
Op
