3+1 Button Smart Car Key for Subaru Ascent

Product Overview

The 3+1 Buttons HYQ14AHK Smart Key is a high-performance aftermarket remote key tailored for a wide range of Subaru models, including the 2019-2020 Subaru Ascent, 2019-2020 Subaru Forester, 2019-2020 Subaru WRX, 2018-2019 Subaru Crosstrek, 2017-2019 Subaru Impreza, 2018-2019 Subaru Legacy, 2018-2020 Subaru Outback CVT and 2019 Subaru STI. Engineered with a 4D CHIP and 315MHz frequency, this Subaru smart remote key delivers reliable keyless entry and control functions, covering lock, unlock, trunk release and panic alarm. As a cost-effective aftermarket solution, it perfectly matches the performance of original keys while being more accessible for vehicle owners needing a replacement or spare key. Its compact design ensures easy carrying, and the durable construction guarantees long-term use, making it an ideal choice for Subaru enthusiasts seeking practicality and efficiency.

Technical Specifications

Key Features & Benefits

Advanced 4D CHIP Security

The integrated 4D CHIP provides strong anti-theft protection by generating a unique rolling code for each use. This prevents code copying or signal hijacking, ensuring your Subaru vehicle stays secure at all times.

Stable 315MHz Signal Transmission

Operating at 315MHz frequency, the smart key maintains a consistent signal connection within the standard operating range. It is less prone to interference in most daily scenarios, enabling smooth lock/unlock and trunk release operations.

Wide Model Compatibility

Unlike single-model keys, this HYQ14AHK remote key fits multiple Subaru models produced between 2017 and 2020. It eliminates the need to purchase different keys for different Subaru vehicles in your garage.

Easy Battery Replacement

Powered by a widely available CR2032 battery, the key allows for hassle-free battery replacement. You can buy the battery at any local auto parts store or supermarket without professional assistance.

Working Principle

The Subaru smart key works based on radio frequency (RF) communication and chip recognition. When you press a button on the key, it sends a 315MHz RF signal containing the unique code from the 4D CHIP to the vehicle’s onboard receiver. The vehicle’s system then verifies the code: if it matches, the system executes the corresponding command, such as unlocking the doors or opening the trunk. For the panic function, the key triggers a high-frequency signal that activates the vehicle’s alarm system and flashing lights. The smart key function relies on the key being within the vehicle’s operating range; once the key is inside the car, the system will block the lock command to prevent accidental locking.

Installation & Usage Tips

Installation Notes

This aftermarket key requires professional programming to match your Subaru vehicle. We recommend consulting a certified car locksmith or Subaru service center for programming.

No additional tools are needed for physical installation; the key is ready for programming right out of the box.

Usage Tips

Do not lock the doors when the entry key is inside the vehicle. Although the system has a protection mechanism, extreme environmental conditions may still cause accidental locking.

When the key battery is low, or you are in an area with strong radio waves, the operating range may shorten or the key may fail to work. In this case, manually use the lock/unlock function.

Keep the door handle dry after car washing or heavy rain. A wet handle may trigger accidental lock/unlock when the key is within range.

FAQ

Can I program this key by myself?

No, this key requires professional programming equipment and technical expertise. We suggest contacting a local car locksmith for programming to ensure compatibility with your vehicle.

How long does the CR2032 battery last?

Under normal use, the battery can last 1-2 years. The lifespan may vary depending on the frequency of button presses and storage conditions.

Is this key compatible with the 2021 Subaru Ascent?

No, this key is only designed for the 2019-2020 Subaru Ascent models. Please check your vehicle’s production year before purchasing.