Toyota Yaris: Vehicle Stability Control System / Brake Warning Light does not Come ON
DESCRIPTION
The skid control ECU (brake actuator assembly) controls the brake system warning light in the combination meter assembly via CAN communication.
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
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PROCEDURE
| 1. | CHECK GTS OUTPUT (CAN COMMUNICATION SYSTEM) |
(a) Operate the GTS, and check for DTCs related to the CAN communication system.
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| Result | Proceed to |
|---|---|
| Any CAN communication system relating DTCs are output | A |
| None of the above conditions are met | B |
| A |
 | INSPECT CAN COMMUNICATION SYSTEM |
|
| 2. | INSPECT COMBINATION METER ASSEMBLY |
(a) Perform the Active Test of the combination meter assembly using the GTS.
Body Electrical > Combination Meter > Active Test| Tester Display |
|---|
| Brake Warning |
(b) Check the combination meter assembly.
OK:
The brake system warning light turns on or off in accordance with the GTS operation.
| OK |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
 | INSPECT METER / GAUGE SYSTEM |
Brake Warning Light Remains ON
DESCRIPTION This procedure is for troubleshooting when the brake system warning light remains on but no DTCs are output. The skid control ECU (brake actuator assembly) controls the brake system warning light in the combination meter assembly via CAN communication...
Slip Indicator Light Remains ON
DESCRIPTION This procedure is for troubleshooting when the slip indicator light remains on but no DTCs are output. The skid control ECU (brake actuator assembly) controls the slip indicator light in the combination meter assembly via CAN communication...
Other information:
Toyota Yaris XP210 (2020-2026) Owner's Manual: Rocking the Vehicle
If you must rock the vehicle to free it from snow, sand or mud, depress the accelerator slightly and slowly move the shift lever from 1 (D) to R position. WARNING Do not spin the wheels at more than 35 mph (56 km/h), and do not allow anyone to stand behind a wheel when pushing the vehicle When the vehicle is stuck, spinning the wheels at high speed is dangerous...
Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Engine Immobiliser System Circuit Short to Battery (B279A12)
DESCRIPTION If the communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high, the ECM will store this DTC. DTC No. Detection Item DTC Detection Condition Trouble Area Note B279A12 Engine Immobiliser System Circuit Short to Battery The communication line (IMI - EFIO) between the ECM and ID code box (immobiliser code ECU) is stuck high...
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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)