Infiniti G37 Keyless Entry Not Working: What to Do

Standing in a parking lot with a car that won’t open is frustrating. You press the button, but nothing happens. The doors stay locked, and the silence is loud. I have been there too many times. You will learn the exact steps to fix your remote and get back on the road today.

You should start by checking the small battery inside your key fob. Most people assume the car is broken, but the remote is usually the culprit. Grab a fresh battery, open the plastic casing carefully, and swap the old one out. If that fails, test your spare key or check the car fuse box.

Why Your Keyless Remote Fails

The G37 uses a complex system to talk to your key fob. When that link breaks, you lose access to your doors. It is a common headache for owners.

Key Fob Battery Power

The battery inside your remote loses charge over time. You might notice the range getting shorter before it quits. A weak signal means the car cannot hear the command. Open the fob, look for a standard coin battery, and replace it. This simple fix solves most problems without costing much money at all.

Signal Interference Issues

Sometimes the air is full of invisible noise. Cell towers or other electronic devices can block your signal. Move your body closer to the door handle to see if that helps. If it works nearby, you have interference. Try to park in a different spot next time you stop for gas.

Fob Button Wear

The rubber buttons on your remote get stiff after years of use. They might stop making contact with the circuit board inside. Press the button hard, or try the other buttons on the fob. If the light flashes but the door does not move, your hardware needs a deep clean.

Internal Board Damage

Did you drop your keys in a puddle or on the concrete? Water and hard hits wreck the tiny parts inside. The circuit board is delicate, so treat it with care. If you see cracks or green gunk on the board, you likely need a new remote unit from the store.

Car Antenna Reception

Your car has hidden antennas that catch the signal from your pocket. If these parts fail, the remote cannot reach the computer. This is rare, but it happens in older cars. You might need a shop to test the car signal strength, as this is a deeper electrical issue for pros.

System Programming Loss

Keys lose their memory of the car sometimes. If you changed the battery, the car might have forgotten the code. You can try a manual reset, or you can go to a dealer for a quick sync. This rarely happens on its own, but it is a possible reason for failure.

You need to be patient when you troubleshoot this car. Take your time, check the basics first, and do not buy expensive parts yet. If the problem persists, see a pro who understands the electrical system of these specific luxury Japanese sedans.

• Check the battery voltage first.
• Inspect the fob circuit board.
• Test the spare key fob.
• Clean the remote button contacts.
• Check the car door fuses.
• Contact a locksmith for help.

How to Fix the Keyless System

Fixing your G37 remote requires a systematic approach to find the fault. Many owners fix this at home, saving a trip to the dealer. Follow these logical steps to restore function.

Check Battery Voltage

Start with the easy stuff. A dead battery is the most common reason for a failed signal. Use a multimeter to see if the cell has power, or just toss it and buy a fresh one. A weak battery sends a signal that is too quiet for the car to detect, so never assume a used battery works.

Clean the battery contacts while the remote is open. Use a dry cloth to wipe away dust or grime, as this prevents a good connection. Make sure the battery sits tight in the slot, and ensure the metal prongs touch the top and bottom of the cell. Proper contact is the secret to a strong signal.

If the new battery does not work, check the orientation. The positive side must face up or down depending on the model. Check the manual inside your glove box if you feel unsure about the direction. A battery installed backward will never work, and it might even damage your delicate remote circuitry.

Inspect Circuit Boards

Look at the green board for signs of wear. If you see broken solder joints, the signal path is cut. Sometimes a tiny piece of metal breaks off after a drop. You can use a magnifying glass to spot these issues, or just look for loose parts that rattle when you shake the remote.

Sometimes dirt creates a bridge across the board. This causes the car to think you are pressing buttons that you are not touching. Use a tiny amount of rubbing alcohol on a soft brush to clean the board. Let it air dry for an hour before you try to use it again.

If the board looks scorched or has brown marks, the internal chip is likely fried. Heat from a bad battery or liquid damage causes this. Do not try to solder this yourself unless you have the right tools. It is usually better to buy a replacement board and program it for your car.

Test Door Locks

The issue might not be the remote at all. Test the manual lock button on the driver door panel. If the locks work with the interior button, the car power systems are fine. This points the finger right at your key fob, meaning you can stop worrying about the main car computer.

If the interior switch does not work either, you have a blown fuse. Look in the fuse box near your feet. Find the label for the locks, and pull the fuse to check the metal wire inside. A broken wire means you need a new fuse, which is a very cheap and fast fix.

Listen for a clicking sound when you press the button. If you hear a click but the door stays shut, the motor in the door is likely stuck. A stuck lock motor needs grease, or it might need a full replacement. You have to take the door panel off to see the lock assembly.

Evaluate Signal Strength

Distance is a big factor when your battery is getting old. Try to stand right next to the driver window and press the unlock button. If it works there but not ten feet away, your signal is weak. Replace the battery, and if that fails, your fob antenna is probably failing.

Check for metal objects in your pocket that block the signal. Keys, coins, or your phone can disrupt the waves coming from the remote. Remove these items and try again. Sometimes the simplest fix is just changing how you hold the remote, so keep your hand away from the buttons until you reach.

Some G37 models have a separate receiver module. If you cannot get a signal even when standing inside the car, the receiver might have stopped working. This part is usually behind the dash or near the rear window. This is a complex repair that requires tools to reach the wiring harness.

Perform Manual Sync

Syncing is a way to tell the car that your remote belongs to it. Put your key in the ignition, and turn it to the accessory position. Press the lock button on your fob, and watch the lights on the dash. This process tells the car to listen for the remote signal again.

The exact steps vary by the year of your car. Search for the reset sequence for your specific trim level, as it changes slightly. Do not get discouraged if it takes a few tries. It is a digital handshake, and sometimes you have to offer it a few times to work.

If you have two remotes, sync both at the same time. The car clears old codes when you start the sync process, so you must add all remotes in one sitting. If you leave one out, it will stop working when you finish the process. Keep all your keys ready to go.

Seek Professional Help

When all else fails, you need a pro. A local locksmith can often program a new remote for half the price of a dealer. They have the computers to talk to your car, and they can diagnose problems that you cannot see with your eyes. Save your time and pay them.

Ask them to test your fob frequency. They have tools that see if the remote is actually sending a signal. If the remote is dead, they will know in seconds. This saves you from buying parts that you do not need, so let them run the quick test first.

Always ask for a quote before they start. A simple sync should not take long, so the price should stay low. If they try to sell you a new ignition system, get a second opinion. Most of the time, it is just a bad fob or a simple code reset issue.

Try the cheap fixes before you spend big money at the shop. Most of the time a battery or a cleaning does the trick. You have plenty of options to try, so stay calm and keep working through the list until the doors start to click again.

• Replace the remote battery.
• Clean the circuit board.
• Check the door lock fuses.
• Verify the fob signal.
• Sync the key to the car.
• Ask a local locksmith for advice.

Is the Key Fob Battery Dead

The battery is the first thing that goes bad in a remote. It powers the transmitter, and it dies after a few years of daily use. You will notice the range drops, or you have to press the button multiple times to get a reaction from the door locks.

If you have a spare key, test it now. If the spare works perfectly, your main remote definitely has a dead battery or a failed circuit. If both keys fail, the problem is likely in the car, or you have an issue with the signal receiver located inside the vehicle.

Do not ignore this problem for too long. Sometimes a bad battery leaks acid onto the board. This ruins the remote permanently. If the battery looks crusty or wet, wipe it clean immediately. You want to save the electronics before they corrode beyond any chance of a simple repair.

Go to a local store and buy a common lithium coin battery. Most auto parts shops carry them, and they cost very little. It takes two minutes to pry the case open and swap the cell. You will be surprised how often this fixes the issue, as it solves many headaches.

• Look for a low battery warning.
• Check the battery part number.
• Use a small flat screwdriver.
• Avoid scratching the plastic case.
• Test the remote after swap.
• Dispose of old batteries safely.

Can a Door Fuse Cause Lock Failure

Your G37 has a fuse box that protects the electrical circuits. If the power door locks stop working, the fuse might have popped. This happens if there is a short in the wiring or if the lock motor pulls too much power because it is stuck or very dirty.

Check your owner manual to find the fuse location. It is usually under the dash on the driver side. You will see a plastic cover that pops off easily. Look for a diagram that shows which fuse controls the door locks. Pull it out and look at the tiny metal wire.

If the wire inside the fuse is broken, you found the culprit. Buy a replacement fuse of the exact same size and color. Push it into the slot firmly. If it pops again immediately, you have a bigger short in the wires. That requires a shop to trace the electrical path.

Checking fuses is cheap and fast. It keeps you from spending money at a dealership for a job that takes five minutes. Always carry a few spare fuses in your glove box, as you never know when a simple electrical surge might cause a small problem while you are driving.

• Locate the interior fuse box.
• Use a fuse puller tool.
• Check for a broken wire.
• Match the fuse amp rating.
• Push the new fuse tight.
• Test the locks after replacement.

Are There Issues with the Receiver

The receiver acts like an ear for your car. It listens for the secret code sent by your remote. When this part fails, your car essentially goes deaf. You can press the button all day, but the car will never know that you are standing right outside the door.

This issue is rare but annoying. You might notice the remote works only when you touch the glass. This means the receiver is struggling to catch the signal. It might be covered in dirt, or the antenna wire might have come loose from its clips inside the body paneling.

You can try to reset the computer by disconnecting the car battery. Leave the negative cable off for ten minutes. This forces the modules to restart. Sometimes this clears up a software glitch in the receiver. Just remember that your radio stations will need to be set again afterward.

If that does not work, a pro needs to check the wiring. They will look for loose connections or corrosion on the plugs. Replacing a receiver module is possible, but it is an advanced task. Most of the time, this is not the root cause of your locking troubles.

• Check for loose antenna wires.
• Disconnect the main battery.
• Look for moisture damage.
• Inspect the module plugs.
• Test signal range distance.
• Consult a professional mechanic.

Do I Need a New Key Fob

Sometimes the internal chip just gives up. This happens if the remote is old, or if you dropped it into water. You can try to dry it out, but some damage is permanent. If you tried a new battery and a cleaning, it is time to face the truth.

You can buy a replacement fob online. Look for the same part number as your old one. You will have to program it to your car, but instructions are easy to find. Make sure you buy a reputable brand, as cheap knock-offs often fail to hold the code for very long.

Programming a new remote can be a DIY project. Some models let you do it with a specific sequence of key turns and button presses. Other years require a special scan tool. Call a locksmith to see if they can do it at your house for a flat fee.

Having two working remotes is a great idea. If one breaks, you have a backup ready to go. It saves you from getting stranded in a parking lot. Treat your keys well, keep them dry, and they will serve you for many years of driving your G37.

• Compare the serial numbers.
• Verify the remote frequency.
• Check for programming steps.
• Buy from a trusted source.
• Sync with the main computer.
• Test all remote buttons.

Final Thoughts

I hope this guide helps you get your locks working again. Car trouble is never fun, but you are more capable than you think. Start with the easy battery swap and move forward from there. You can handle this task with just a few simple tools and some patience. If you get stuck, a local locksmith is your best friend. Good luck with the repair, and enjoy driving your G37 again soon.

Frequently Asked Questions

Is the Battery Replacement Hard to Do?

Replacing the battery is very easy for most owners. You just need a small screwdriver to pop the plastic case open. Take the old cell out, put the new one in the same way, and snap the cover back together. It takes about two minutes of your time.

Can I Program a New Remote Myself?

You can program many G37 remotes using a specific series of steps involving the ignition key and the door locks. However, some newer years require a computer tool that only a locksmith has. Check your owner manual for the specific sequence required for your car.

Are Cheap Online Remotes Worth the Money?

Cheap remotes often fail quickly because they use low-quality parts inside. They might work for a few days, but they stop holding their sync with the car. It is usually better to spend a little more on a quality part that will last for years.

Do I Need to Visit the Dealer for This?

You do not have to visit the dealer for most locking issues. A local mobile locksmith can usually cut and program new keys for much less money than the dealership charges. They provide the same service and usually come to your house for the work.

Does Water Damage Ruin the Fob?

Water is very bad for the electronics inside your remote. If you drop it in a puddle, open it up immediately and wipe the circuit board with alcohol. Let it dry completely in a warm place before you try to put a battery back inside.

Should I Replace My Door Lock Motor?

If your locks click but do not move, the motor inside the door might be failing. This is a mechanical issue rather than an electronic one. You should lubricate the linkage first, but you may need to replace the motor if it stays stuck.

Will a Blown Fuse Affect My Alarm?

A blown fuse often stops the power from reaching the door modules and the alarm sensors. If your horn does not beep when you lock the doors, check the fuse box first. A simple fuse swap often fixes the entire security system in one go.

Does the G37 Have an Internal Reset?

The G37 computer resets if you disconnect the car battery for about ten minutes. This clears out temporary software errors that might block your remote signal. It is a helpful trick for strange electrical glitches, but make sure you have your radio code ready.