how to diagnose C1201 error code on my Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the battery to avoid any electrical shorts during repairs.

2. Inspect ABS Fuses

• Locate the fuse box (usually found under the dashboard or in the engine compartment).
• Remove the cover and identify the ABS fuse based on the vehicle's manual.
• Use a fuse tester to check if the fuse is blown. Replace if necessary.

3. Check Wiring and Connectors

• Visually inspect all wiring harnesses and connectors connected to the ABS system.
• Look for frayed wires, corrosion, or loose connections.
• Repair or replace damaged wires or connectors as needed.

4. Test Wheel Speed Sensors

• Locate each wheel speed sensor (usually mounted near the wheel hub).
• Disconnect the sensor connector and use a multimeter to measure resistance; it should typically be around 1,000 to 2,000 ohms.
• If the resistance is out of spec, replace the wheel speed sensor.

5. Check ABS Module Power Supply

• Reconnect the battery and turn the ignition on without starting the engine.
• Use a multimeter to check for voltage at the ABS module connector.
• If there is no power, trace back the circuit to find the issue, possibly involving the ABS relay.