Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC C1A4A: Skid Control Buzzer Circuit: Description
Based on pre-collision control, the driving support ECU communicates to the driver to be careful. The driving support ECU performs this by sending a sounding signal to the brake booster with master cylinder (skid control ECU) to sound the skid control buzzer.
When the brake booster with master cylinder (skid control ECU) detects a malfunction in the VSC warning buzzer circuit, a malfunction signal is sent to the driving support ECU, and a DTC is stored. Although the brake booster with master cylinder (skid control ECU) sends a malfunction signal to the driving support ECU, the vehicle stability control system does not stored a relevant malfunction detection DTC.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1A4A | When the power switch is on (IG), a skid control buzzer circuit malfunction signal is received from the brake booster with master cylinder (skid control ECU). |
|
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.