Start a Smart with a Dead Key Fob

How to Start a Smart with a Dead Key Fob

This page holds all of the emergency start or back-up start procedures needed for Smart vehicles if the battery in the key fob dies or if there are electrical signals interfering with the fob.

• But first, if you are still locked outside, click here.
• Finally, if you need or want another manufacturer, click here.

Even with a bad battery in the key fob of Fortwo models the car should still recognize the key when the ignition switch is turned and start.

Smart 1 and 3

In these models, first released in 2022, the key fob is placed on a mark at the bottom of the center console (right). Once the fob is placed on the spot, the vehicle can be started as normal, which in the case of these vehicles, by stepping on the brake and placing it into forward or reverse. The Ready indicator will be visible,

Smart 5

The Smart 5 presents a bit of a problem. The vehicle is equipped with an NFC (Near Field Communication) key, which is a key card. The company says the back-up start option is to use either the company’s app or placing the NFC key on the charging pad at the front of the console (right). The pad location is swapped in right-hand drive models.

However, we have seen this same spot recognize the key fob itself in vehicles from other manufacturers. Key cards are easily lost or misplaced. We recommend trying this fob on this spot as a back-up. We’ll test this if we ever see a Smart 5 here in the U.S.

Models examined include the Fortwo, EQ Fortwo, Smart 1, Smart 2, and Smart 3. Model years 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, and 2024.

… Return to Part I, Getting In

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The information on this website is provided for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.

Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.

Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.

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