How to Open a Nissan or Infiniti with a Dead Key Fob
- First, if you are already inside, click here for help getting started!
- Second, for video help, click here!
- Finally, if you need or want another manufacturer, click here.
Retrieving the mechanical key
For a Nissan– and Infiniti-made vehicle, to remove the mechanical key, release 
the lock knob at the back of the Intelligent Key (remote control or ‘clicker’). Use the mechanical key in the driver’s door key cylinder to unlock the door.
And then in 2017, Infiniti introduced the QX30 AND a brand new key fob. At least to them. So, here’s the deal…
The second key fob is the spitting image of the fob used by the Mercedes-Benz folks for years. A few old Chrysler Corp. (now FCA) vehicles use it too.
The fob (right) has a tapered tip at one end and a slide lever at the top of the key ring end (1). Slide the lever over and pull the key ring to retrieve the mechanical key.
As noted, the key hole on nearly all Nissan and Infiniti models is visible at the back of the driver’s door handle, and the mechanical key can be used to unlock it. Two exceptions to this are the Nissan GT-R and the Infiniti QX80. The key hole is a bit hidden, behind the front of the driver’s door handle and a cap that must be removed.
To access the key hole, press the rear end of the driver’s door handle to lift up the front end, just as you would normally to get inside. Note the cap shown in the image (above right, A). While holding the door handle out, use the mechanical key and turn the cap counterclockwise to remove it. Once removed, the key hole is exposed and the mechanical key can at last be used to unlock the driver’s door (above right).
In the 2025, the QX80 offered a new feature — flush door handles that extend when the key fob approaches the vehicle. If the battery in the fob is weak or dead, this will not occur. Getting to the key hole is a process similar to that for the GT-R. Press the front of the door handle inward. This rotates the rear of the handle outward (right, upper). The handle can then be pulled open. Do so as far as it will go exposing the key hole beneath the back of the handle (right, lower). You can now use the mechanical key to unlock the car.
Click here for video help with Nissan and Infiniti models and key fobs.
Models examined include 370Z, Altima, Armada, Cube, Frontier, GT-R, Juke, Kicks, Maxima, Murano, NV, Pathfinder, Quest, Rogue, Sentra, Titan, Versa, Xterra, Z, EX, FX, G, JX-35, M, Q40, Q50, Q60, Q70, QX30, QX50, QX55, QX56, QX60, QX70, and QX80.
Continue to Part II, Getting Started …
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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.
These posts are 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.
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.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY
Mercedes-Benz now features two SmartKey styles. The original and most common style is tapered, like the one shown to the right. To retrieve the mechanical key, slide the release catch found near the top of the fob in the direction of the arrow and pull the mechanical key away from the SmartKey (remote control or ‘clicker’).
In 2017, a second, rounded SmartKey style was introduced in the E-Class sedan, and is shown to the right. It migrated to S-Class sedans in 2018 and is found in all 2018 E-Class models.
In 2021, another key fob was added to the S-Class Maybach that looks similar and operates very similarly. It is a little more tapered at the key ring end. Again, push the button on the back and remove the mechanical key.
Make sure the handle of the mechanical key is pointed away from the paint. Insert the key into the opening (black arrow) underneath the cap as far as it will go. Hold the door handle out. Pull the cap that is now on the mechanical key as straight as possible away from the vehicle until it releases.
The 2021 Maybach adds flush door handles. This has now been added to AMG and EQS models in 2023, EQE, E-Class, S-Class and C-Class models in 2024.
Finally, the 2023 CLE Cabriolet and 2024 GLC models employ yet another method to hide the key hole. Pulling the driver’s door handle to the open position reveal the key hole underneath the back of the handle. Simply insert the key and turn and you’ll be inside. And yet again, the alarm will likely sound, but it will go off when the car is started.
How to Open a Mazda with a Dead Key Fob
Retrieving the mechanical key
In 2020, Mazda introduced a new key fob style. It is distinguished by the lock, unlock etc. buttons being found on one side of the fob. The mechanical or auxiliary key is found inside.
away in the opposite direction and removed. The mechanical key can be seen inside and is simply lifted away, as shown.
models, the key hole can be seen only when the door handle is pulled to the open position. It may be awkward to reach and drivers with large hands may have difficulty, but the mechanical key must be inserted into the key hole while the door handle is pulled open. See the image to the right.
and hold the release button while pulling the key blade from the Smart Key (remote control or ‘clicker’) body. The release button must be pressed as well to return the key blade.
For the second, press and hold the release button on the side of the fob, while lifting the emergency (mechanical) key blade cover from the Smart Key body. Extract the emergency key blade and unfold. On some models, the lock cylinder (keyhole) at the back of the door handle will be visible. If so, use the key blade to unlock the door.
The third version, used by both Jaguar and Land Rover, hides the mechanical or emergency key beneath a chrome cover on one side of the fob. Slide the side cover towards the top of the fob as shown to release and remove it. The mechanical key can then be slipped out the same way and unfolded.
The newest version of the fob is thankfully a simple side button press (arrow, right) and a pull. The mechanical key is the key ring end of the fob. We have seen two instances of mechanical keys missing from key fobs in the previous styles. This will not be an issue with the newest fob.
If the keyhole is not visible, insert the key blade into the slot at the base of the door lock cover located near the back of the driver’s door handle and lift slightly to pry away the lock cover and expose the lock cylinder. The key blade will need to be twisted slightly as well. If you are in the dark, you may need to feel for the slot. Yes, you must pry off a piece of the car. It is uncomfortable but necessary and will uncover the hidden keyhole.
the Style 3 key fob, the process is just slightly different. There is still an access hole or slot beneath the key hole cover. Insert the key blade into the slot and press down on the cover slightly. Gently lever the key blade upwards and rotate the lock cover upwards to release it. And again, yes, you are prying off a piece of the car.
the key fob’s battery is dead or there is interference. The Land Rover Evoque and Jaguar I-Pace now feature the new handle as well. Other models will likely follow.
Once you have exposed the lock cylinder at the rear of the handle, use the mechanical key, which is the same in this model as others built since 2015, to unlock the driver’s door. Again, the alarm sounds until the Smart Key is positioned correctly. To disarm the alarm continue to Starting Instructions in Part II.
Retrieving the mechanical key
To use the most common Hyundai key fobs, press and hold the release button at the key ring end of the remote control or ‘clicker’ and pull the key ring to remove mechanical key. Use the key to unlock the driver’s door. They too remain in limited use today (2025).
The exception come in the form of key fobs with the mechanical release on the back, which. Hyundai began using in 2019 (right). Push the button in order to release the mechanical key.
supplying a new key fob and separate mechanical key shown to the right. This fob has spread to other models as well. To use the mechanical key, a protective cover must be removed and its handle rotated down.
trick. Several other Hyundai models have been added since, namely the Santa Fe, in 2024, and Venue. These models all feature a two-piece door handle. As shown in the image to the left, press the mechanical key into the slot found under the cover at the back of the driver’s door handle (1) and pull forward and up by hand (2).
A “hybrid” of this was introduced in 2020 in the Sonata. By 2024, it is found in the Elantra, Santa Cruz, and Tucson. The mechanical key is again slipped into a slot beneath the back of the door handle and pushed upwards. Now however, a small cover, seen in blue to the left, is slid to the side and out of the way. This should be done when the mechanical key is still inserted and pushed upward. The keyhole is then revealed.
The redesign of the Kona brings with it a new and odd door two-piece handle, as seen to the left. It still features a cap that hides the key hole, which must be removed. It looks like the others, but to get at the key hole, lift the door handle and hold it in the open position. Slip the mechanical key into the open slot in the cap from behind it and rotate the cap upwards. It will come free, exposing the key hole.
In 2019, a very different hidden key hole style was introduced in the Hyundai Santa Fe (removed in 2024), the new Palisade model a year later and the Elantra in 2021. The handle for all intents and purposes is one piece, but a small piece of horizontal trim located just behind the black entry button (arrow) is removable. Pull the handle outward. This exposes another small black button just behind the handle (2, below). Look at the handle from behind to find it.
Push the button inwards using the mechanical key. This releases the trim piece that can be swung away exposing the keyhole. The key can then be turned to unlock the car. Pull the key out before opening the door to avoid damaging the door handle.
Afterwards, the cover can be pressed back on, but your immediate concern is getting into your car.
In the Nexo, a plug protects the key hole, likely from water and debris. Use the mechanical key to pry the plug away (first image left) and then insert the key to unlock the car.
Hyundai vehicles that include a separate mechanical key include two digital options and a facial recognition option. Digital options include a pre-registered card key and a smart phone app on a registered smart phone. The card key and app can also start the car. However, facial recognition will only open the vehicle, so the key fob, card key or smart phone app will be needed to start the car.
Facial recognition is accomplished using a camera mounted in the pillar behind the driver’s door. Again, this will only allow entry and other means will be needed to start the car, so this is of limited value.
fob (remote control or ‘clicker’) styles, and Chevrolet uses them all. To get in the vehicle when the key fob battery is dead, a mechanical key will have to retrieved from the fob and used to unlock the car.
In next style is a flip key, shown to the left, press the unmarked chrome button to extend the mechanical key. It remains attached to the key fob. Use the mechanical key to unlock the driver’s door.
The final rounded style key fob is similar to the rectangular fob, in that the mechanical key is removed from the fob for use getting into the vehicle. However, it is similar in appearance to Style 2. To remove the mechanical key, press the button on the side of the transmitter near the key ring, as shown, and pull the key out.
Chevrolet models with traditional door handles but no obvious key holes or lock cylinders, hide the key holes under a cap at the back of the driver’s door. They include the Impala, Tahoe, Suburban, Malibu, Cruze, Camaro and Volt as well as new Bolt and Blazer models. To remove the cap, pull the door handle out to the open position. Insert the key into the slot on the bottom of the cap (“3”, right).
Corvette models are a very different animals. The C6 through C8 models have non-traditional, all electronic locks, latches and door handles, if they can be called handles at all. The C8 does have a key cylinder, but it is found in the air inlet located on the body, behind and above the left door handle. See the image to the right. Insert the mechanical key and turn to open the car.
Older C6 and C7 Corvette models, also have flush door handles (right image) with no key holes at all. They have a very different trick up their sleeves. You must use the mechanical key to open the trunk. The key hole is under the lip of the trunk lid facing the ground.
Once the trunk is open, you will find a release handle. It is along the left wall of the trunk in the Corvette (right).
(IA) (remote control or ‘clicker’) key styles. Two of the key fobs use a sliding release on the back side to release the key. Two new key fobs use a push button to release the mechanical key, and one is much easier than the other to use. Another holds the key inside the fob itself and is really difficult to remove.
To release the mechanical key blade in your IA key fob, slide the release on the back of the transmitter and pull the blade out. You can now use the mechanical key to unlock the driver’s door.
(pull is straight up and off) to access the key blade. Its awkward and may take some practice. That mechanical key can now be used to unlock the driver’s door.
To remove it, push the buttons on either side of the key fob.
It has a push button on the front of the mechanical key itself near the key ring space. Simply push the button and pull the mechanical key away from the IA key.
the 2016 Edge have since been added to this list.
The Ford Expedition is updated for 2018, and features another way to hide the key hole. The door handles are a single piece. The key hole is easily exposed by simply pulling the driver’s door handle. It is seen angled outward at the back end of the handle. Insert the mechanical key and turn clockwise. Remove the key and release the handle. The door will open on the next pull. Note that the alarm will sound in a minute or so if the car is not started in time.
The Ford GT uses all electronic locks and latches. The end result is that there is no key hole to unlock a door. So, to get in, you’ll need to open the rear hatch!
Competition Series GT, the key hole is on the top of the hatch.
The new all electric Mustang Mach E uses electronic latches. A button above the door handle (right) is pressed and the door pops open. If the key fob is dead, the vehicle offers is no opportunity to use the mechanical key to get inside. However, the car can be accessed with an app on your smart phone or using the keyless entry code panel on the door post.