Toyota Vios, Innova, Fortuner, Yaris Clock Spring 2008–2014 Genuine Part 843060D120 is an important component in the steering wheel electrical system, responsible for transmitting electrical signals from the steering wheel to systems such as the horn, airbag, and integrated control buttons.
This part operates as a spiral coil, allowing the steering wheel to rotate continuously without breaking the internal circuit. As a result, the safety and convenience functions on the steering wheel always work stably in all driving conditions.
In addition to signal transmission, the clock spring also plays a key role in the airbag safety system. In the event of a collision, the airbag trigger signal must pass through the clock spring to ensure the airbag deploys at the right time and protects the driver.
With long-term use, the clock spring may develop an open circuit, a stuck spiral cable, or contact issues due to repeated steering wheel rotation. When this happens, symptoms may include a non-working horn, an airbag warning light, or steering wheel buttons that no longer respond.
Product 843060D120 is designed to Toyota genuine standards, ensuring high precision, strong durability, and long-lasting stable performance. This part is compatible with many Toyota models such as Vios, Innova, Fortuner, and Yaris from 2008–2014, with OEM-style fitment and no modification required.
Product information
• Product name: Clock Spring / Spiral Cable
• Part number: 843060D120
• Standard: Toyota Genuine
• Applicable models: Vios, Innova, Fortuner, Yaris 2008–2014
• System: Steering wheel electrical system – horn – airbag
• Installation position: Behind the steering wheel
• Condition: New
Functions and role
• Transmits horn signals from the steering wheel
• Connects the safety airbag system
• Transmits steering wheel control button signals
• Allows the steering wheel to turn freely without breaking wires
• Ensures stable operation of the steering wheel electrical system
Key advantages
• Genuine Toyota part with high durability
• Stable signal transmission, precise contact
• OEM-style design, easy to install
• Handles the large steering rotation range
• Helps ensure airbag system safety
Signs it needs replacement
• Horn does not work
• Airbag warning light on the dashboard
• Steering wheel buttons stop responding
• Intermittent signal, sometimes working and sometimes not
• Unusual noise when turning the steering wheel
👉 The clock spring usually fails due to an internal broken spiral wire or worn contacts after long-term use.
Replacement recommendations
• Disconnect the battery before replacement for safety
• Align to the correct center position before installation
• Do not turn the steering wheel while the clock spring is not installed correctly
• Check the entire airbag system after replacement
