what does it mean if my Toyota Highlander Third Generation (2014-2019) has code C1201

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Wiring

• Sub-steps:
  • Visually inspect the ABS harness and connectors for any signs of damage.
  • Clean any corrosion found on connectors using electrical contact cleaner.
  • Repair or replace damaged wiring as needed.

3. Brake Fluid Check and Replacement

• Sub-steps:
  • Remove the brake fluid reservoir cap and check the fluid level.
  • If the fluid is low, top it off with the manufacturer's recommended brake fluid (DOT 3 or DOT 4).
  • If the fluid is contaminated, perform a brake fluid flush:
    • Attach a brake bleeder kit to the brake bleeder valve on each wheel.
    • Open the valve and pump the brake pedal until clean fluid comes out.
    • Close the valve and repeat for all four wheels.

4. Inspect and Test ABS Wheel Speed Sensors

• Sub-steps:
  • Disconnect the wheel speed sensor connectors at each wheel.
  • Measure the resistance of each sensor using a multimeter; it should be within the manufacturer's specified range.
  • Replace any faulty wheel speed sensors.

5. Reset ABS Control Module

• Sub-steps:
  • Reconnect the battery terminal.
  • Use an OBD-II scanner to clear the C1201 code from the ABS control module.
  • Perform a test drive to ensure the code does not reappear.