Toyota Yaris: Vehicle Stability Control System / VSC does not Operate or VSC does not Operate Correctly
DESCRIPTION
When TRC or VSC is operating, the skid control ECU (brake actuator assembly) blinks the slip indicator light to inform the driver that slippage occurred.
When a communication malfunction with the ECM is detected, TRC and VSC are disabled. Also, TRC and VSC are disabled when a DTC is stored.
When in VSC off mode, or TRC and VSC are disabled, the multi-information display in the combination meter assembly displays the TRC OFF message and the VSC OFF indicator light illuminates to inform the driver.
CAUTION / NOTICE / HINT
NOTICE:
If the yaw rate and acceleration sensor (airbag sensor assembly) was replaced or reinstalled, perform "Calibration".
Click here
PROCEDURE
| 1. | BRAKE PROBLEM CHECK |
(a) Check whether the slip indicator light was illuminated when VSC did not operate.
OK:
The slip indicator light was illuminated.
HINT:
When a DTC is stored, the slip indicator light is illuminated and VSC does not operate due to the fail-safe function.
(b) Check whether the vehicle speed was 15 km/h (9 mph) or less when VSC did not operate.
OK:
The vehicle speed was 15 km/h (9 mph) or less.
HINT:
VSC does not operate when the vehicle speed is 15 km/h (9 mph) or less.
(c) Check whether the vehicle was driven straight for a few seconds at 35 km/h (22 mph) or more.
OK:
The vehicle was not driven straight for a few seconds at 35 km/h (22 mph) or more.
HINT:
When the ignition switch is turned to ON, as steering sensor zero point calibration is not performed below 35 km/h (22 mph), VSC will not operate until the vehicle is driven straight for a few seconds at 35 km/h (22 mph) or more.
| OK |
 | END |
|
| 2. | CHECK TIRES |
(a) Check that the tire of each wheel is the correct size.
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OK:
The tire of each wheel is the correct size.
| NG |
 | REPLACE THE TIRE OF EACH WHEEL WITH THE CORRECT SIZE |
|
| 3. | CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION |
(a) Check that the yaw rate and acceleration sensor (airbag sensor assembly) has been installed properly.
Click here
OK:
The yaw rate and acceleration sensor (airbag sensor assembly) is tightened to the specified torque.
The yaw rate and acceleration sensor (airbag sensor assembly) is not installed in a tilted position.
| OK |
 | PERFORM CALIBRATION |
| NG |
 | INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY |
ABS Operates Before Necessary When Braking
DESCRIPTION Troubleshooting for when ABS operates too soon due to a noisy signal from the speed sensor, a difference in output, etc. CAUTION / NOTICE / HINT NOTICE:
After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly...
Brake Actuator Operation Sound is Loud during Initial Check
CAUTION / NOTICE / HINT NOTICE: After replacing the skid control ECU (brake actuator assembly), perform "Calibration". Click here
PROCEDURE 1. PERFORM ROAD TEST (a) After turning the ignition switch to ON, compare the operating sound of the brake actuator the first time the vehicle speed reaches approximately 25 km/h (16 mph) with a known good vehicle of the same model...
Other information:
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Inspection
INSPECTION PROCEDURE 1. INSPECT NO. 1 COOLER THERMISTOR (a) Check the resistance. (1) Measure the resistance according to the value(s) in the table below. *a Component without harness connected (No. 1 Cooler Thermistor) *b Sensing Portion *c Resistance (kΩ) *d Temperature (°C (°F)) *e Allowable Range - - Standard Resistance: Tester Connection Condition Specified Condition h5-1 - h5-2 -10°C (14°F) 7...
Toyota Yaris XP210 (2020-2024) Reapir and Service Manual: Power Source Control System Missing Message (B278C87)
DESCRIPTION When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored. DTC No. Detection Item DTC Detection Condition Trouble Area B278C87 Power Source Control System Missing Message An internal malfunction occurs in the certification ECU (smart key ECU assembly)...
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Supplemental Restraint System (SRS) Precautions
The front and side supplemental restraint systems (SRS) include different types of air bags. Please verify the different types of air bags which are equipped on your vehicle by locating the “SRS AIRBAG” location indicators. These indicators are visible in the area where the air bags are installed.
The air bags are installed in the following locations:
The steering wheel hub (driver air bag) The front passenger dashboard (front passenger air bag) The outboard sides of the front seatbacks (side air bags) The front and rear window pillars, and the roof edge along both sides (curtain air bags)