how to fix C1201 code in Toyota Highlander XU70 (2020-Present)

Solution

1. Preparation

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

2. Inspect and Replace ABS Fuse/Relay

• Locate the fuse box under the dashboard or in the engine compartment.
• Remove the ABS fuse and visually inspect it for continuity.
  • Tools Required: Fuse puller or pliers
• If blown, replace it with a fuse of the same amperage.
• Check the ABS relay similarly and replace if necessary.

3. Repair Wiring and Connectors

• Inspect wiring harness from the ABS module to the ECU.
• Look for frayed wires or disconnected connectors.
• Repair any damaged wiring by splicing in new wire or replacing connectors as needed.
  • Tools Required: Wire strippers, soldering iron, heat shrink tubing

4. Test Wheel Speed Sensors

• Locate each wheel speed sensor, typically mounted at each wheel hub.
• Disconnect the sensor connector and measure resistance with a multimeter.
  • Expected Resistance: Typically between 1,000 to 2,000 ohms (check service manual for specifics).
• If out of range, replace the sensor.
  • Tools Required: Socket set, torque wrench

5. Reconnect and Clear Codes

• Reconnect all connectors and wiring.
• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the C1201 code.

6. Road Test

• Perform a road test to ensure the ABS and traction control systems are functioning properly.
• Monitor dashboard lights for any reactivation of the ABS warning light.