how to resolve brake codes C1201 in Toyota Highlander Fourth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and set the parking brake.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Brake Fluid System

• Sub-step 1: Remove the master cylinder cap and check the brake fluid level. If low, fill it with the recommended brake fluid (DOT 3 or DOT 4 as specified in the owner’s manual).
• Sub-step 2: Inspect the brake lines and components for any signs of leakage or corrosion. Replace any damaged parts as necessary.

3. Check Wheel Speed Sensors

• Sub-step 1: Remove the wheel covers or tires to access the wheel speed sensors.
• Sub-step 2: Disconnect the sensor wiring harness and inspect for corrosion or damage.
• Sub-step 3: Clean the sensor connector and reattach. If damaged, replace the sensor with a new one.

4. Test Brake Pedal Switch

• Sub-step 1: Locate the brake pedal switch, usually near the top of the brake pedal arm.
• Sub-step 2: Use a multimeter to check for continuity when the brake pedal is pressed and released. Replace the switch if it fails the test.

5. Clear Codes and Test Drive

• Sub-step 1: Reconnect the negative battery terminal.
• Sub-step 2: Use the OBD-II scanner to clear the C1201 code from the vehicle’s computer.
• Sub-step 3: Take the vehicle for a test drive to ensure proper brake function and verify that the code does not reappear.