Battery Disconnect: Spare Key Functionality Impacted?

Car key problems are a common occurrence, and they can happen to anyone, at any time. There are various reasons why your car keys may stop working, leaving you stranded and stressed. Luckily, most of the time, there are simple solutions to get you back on the road quickly. One of the most common reasons for car key failure is a dead battery. If your key fob has a dead battery, the physical key may still work, but the remote functions may stop working. In this case, the simple solution is to replace the dead batteries with new ones. However, if you don't have a spare battery on hand, you may need to consider other options, such as carrying an extra key fob or seeking professional help.

Dead key fob battery

A dead key fob battery can be a frustrating experience, but there are ways to manage the situation and get back on the road. Here are some tips and insights to help you deal with a dead key fob battery:

Understanding the Issue

Firstly, it's important to understand that a weak or dead key fob battery does not prevent you from starting your vehicle; it only affects the use of the fob itself. Most cars are designed to work with a remote that has a low battery or is completely out of juice. However, the exact method for using your car with a dead key fob may vary depending on the model, so it's always a good idea to refer to your owner's manual for specific instructions.

Unlocking Your Car

If you're facing a locked car with a dead key fob, don't panic. Many key fobs have a hidden mechanical key inside. Look for a small sliding button on the back of your fob. Slide or press the button to release the cover and access the mechanical key. Use this key to gently pop off the handle cover and unlock your car door. If you don't see a key slot, it might be hidden behind the handle, so the mechanical key is still your solution.

Starting Your Car

Once you're inside the car, here's how you can start the engine:

• Put the mechanical key back into the key fob and close it.
• Use the key fob to push the START button. Instead of using your finger, press the key fob against the button. This backup system is used by many manufacturers to ensure the car can start even with a dead fob.
• Some vehicles have a hidden key fob slot. For example, some Ford models have a backup slot inside the cup holder. Slide the dead key fob into the slot and use the push-button start as usual.
• If the above methods don't work, look for a physical key slot in the steering column. Some Mazda models have this feature. Insert the mechanical key to start the engine.

Alternative Methods

If you're still worried about a dead key fob leaving you stranded, there are a few additional methods to access and start your car:

• Access through a mobile app: Many car manufacturers now offer apps that allow you to unlock your car remotely from your phone. Set up these apps in advance to have a backup option when your key fob dies.
• Get closer to the car: If your key fob isn't working from its usual distance, the battery might just be low, not completely dead. Move closer to the car, place the key fob against the door handle, and press the unlock button.
• Call for roadside assistance: If all else fails, don't hesitate to call for roadside assistance. Make sure to confirm that your insurance covers this service and keep the contact information easily accessible.

Replacing the Battery

To replace a dead key fob battery, follow these simple steps:

• Open your key fob. Most key fobs can be opened with a strong fingernail. If that doesn't work, use a small flat-head screwdriver to gently pry it open. Be careful not to apply too much force to avoid damaging the fob shell.
• Identify the battery type. Look for the battery type/number printed on the battery. If you haven't purchased a replacement yet, make a note of the details and buy a suitable battery.
• Replace the battery. Insert the new battery, ensuring it is positioned correctly. Gently snap the fob shell back together and test all the remote buttons to verify that it's working.

Remember, a dead key fob battery doesn't have to ruin your day. With these tips and tricks, you can manage the situation effectively and continue on your way.

Key fob damage

Key fobs are small gadgets that play a significant role in contemporary society, especially with elevating security concerns. They are programmed to control several systems, such as cars or buildings, and offer an easy way of locking, unlocking, or even starting cars.

However, key fobs can be damaged and stop working. One of the most common reasons for a key fob to stop working is a dead battery. In this case, changing the battery is the quickest fix. But if the key fob is damaged, you may need to replace it entirely, which can be costly, especially for high-end vehicles.

Another issue that can cause key fob damage is worn buttons. Over time, the contacts under the buttons can wear down, or the buttons themselves may wear out, resulting in a loss of connection with the contacts. In this case, replacing the remote housing or the entire key fob may be necessary.

Additionally, electrical issues with the vehicle's electrical system can also cause key fob damage. For instance, if the dashboard or side panels are removed and reinstalled, wires can be unknowingly damaged or disconnected, affecting the key fob's functionality. In such cases, a car mechanic is usually required to resolve the electrical problems.

It is important to address car door lock issues promptly, as they can impact the key fob's functionality. If the locks are not opening or locking properly, it may be necessary to repair or replace them.

Car battery malfunction

Another common issue is acid stratification, which occurs when the battery is kept at a low charge and never reaches a full charge. This can be a particular problem for luxury cars with power-hungry auxiliary options and for drivers who frequently take short trips or drive in congested cities. Acid stratification can be corrected by allowing the battery to rest for a few days, applying a shaking motion, or tipping the unit over.

Corrosion at the battery terminals is also a common issue, often caused by sulphation, which is the build-up of sulphate on the plates inside the battery. This adds resistance and reduces the amount of electrical current that can reach the starter motor. To prevent this, it's important to periodically clean the terminals with water and a wire brush while wearing gloves and eye protection.

In some cases, car battery issues may be related to electrical problems in the vehicle, such as faulty electrical components or wiring. If the key fob is not working, it's important to check the locks and ensure that the fob has not been accidentally deprogrammed.

Keyless entry system fault

Keyless entry systems are intuitive machines that can help you quickly and securely gain access to a property without having to use a physical key. They are the result of the evolution of technology and security and are quickly replacing traditional locks due to their convenience, security, ease of use, and integration with other security hardware.

While keyless entry systems rarely malfunction, they may not work properly due to environmental or software factors. Here are some ways to troubleshoot common keyless entry system issues:

Check for Power Issues

If the system is not responding or is turning on and off repeatedly, check the power source. Power issues can cause the system to malfunction, and a telltale sign is when the system doesn't turn on or has a flickering screen/interface. Confirm whether there is a blackout in your area. If not, the problem is likely in the wiring or the power supply box. If you have access to the power supply or the power cable, try unplugging and securely replugging it. If the system is battery-operated, check the battery.

Verify the Keypad Hardware

If the system is unresponsive, check whether you can access the keypad. If the keypad is accessible and you can enter codes, the problem may be on the software side. If the keypad is not working, check for power issues. If the system uses a touchscreen, try cleaning it with a microfiber cloth to ensure nothing is interfering with the touch interface.

Update the System Software

Just like smartphones, modern keyless entry systems require constant updates to make them better, more secure, and faster. If the system is not working as intended, reach out to the manufacturer to check for any pending updates. Once updated, the system will automatically flash the internal memory and should reboot normally.

Inspect the Machine for Damage

If the system is not turning on or registering any authentication method, the sensors might be damaged. Carefully check the keyless entry system interface for any obvious damage, such as chips or cracks in the sensors, as this can cause the system to malfunction. In this case, you will need to use an alternative method to operate the system and call a professional to check for repairs.

Test with Backup Keys

If the system is not responding to your saved authentication method, try using backup keys or codes to ensure the system is working properly. If the system doesn't recognize your primary authentication method or the backup codes, there is likely an issue with the internal hardware or software. In this case, you will need to call a professional to check the machine.

Address Environmental Damage

If your keyless entry system is in an area with a lot of dust or rain, clean the sensors regularly with a microfiber cloth to prevent debris from building up and making it harder for the system to authenticate. Do not use a wet cloth unless specified by the manufacturer.

Call in a Professional

When all else fails, seek professional help. Expert locksmiths from reputable security companies can quickly help you gain access to your property and diagnose the problem with the keyless entry system. Consider getting a maintenance contract so that a professional can periodically check the system to ensure it runs smoothly.

In some cases, a software or firmware bug may cause the system to malfunction. As a last resort, you can reset the system to its factory settings to regain access. However, reprogramming should only be done by a professional as it risks wiping the memory of the system.

Car door lock fault

Key Fob Battery Issues:

A depleted battery in your key fob can render it incapable of communicating with your car, affecting the lock and unlock functions. The simplest solution is often to replace the battery with a new one. Key fob batteries are typically coin-type, but you can consult your owner's manual or check the battery itself for the exact type.

Blown Fuse:

A malfunctioning car door lock could be due to a blown fuse. Inspect your vehicle's fuse box for any signs of damage and replace compromised fuses. The fuse box is usually located behind a plastic panel near the driver's side footwell and doesn't require tools to access. Refer to your owner's manual or the diagram inside the fuse box lid to identify the fuse for the door locks.

Key Fob Malfunction:

If the battery isn't the issue, the key fob itself may be defective. Automotive dealers can assess whether the fob is transmitting signals correctly and provide a replacement if necessary.

Solenoid Malfunction:

The solenoid translates electronic signals from your key fob into mechanical actions, such as moving a steel rod to lock or unlock the door. A faulty solenoid may require removal of the inner door panel for replacement.

Broken Rod or Connector:

There's a possibility of a broken rod or, more likely, a plastic connector. These hardware components link the switches on the door panel with the inner and outer door handles and locks. Over time, plastic can harden and become brittle, or gunk can accumulate due to the repeated opening and closing of the window. Removing the inner door panel will allow you to diagnose and fix this issue.

Electrical Problems:

If none of the above solutions work, there may be an electrical problem, such as a malfunctioning logic board or a break in the wire. If the lock function works intermittently, there could be an electrical short due to worn-down plastic insulation on the wire. A complete loss of function may indicate a broken wire.

Door Lock Actuator Issues:

The door lock actuator is a small but crucial component that remotely controls the locking and unlocking of car doors. As your vehicle ages, the actuator may exhibit symptoms such as inconsistent locking and unlocking, unusual noises during operation, sluggish response, or becoming stuck in the locked or unlocked position. Visible physical damage, such as damaged wiring or broken connectors, can also contribute to malfunctions.

Physical Damage:

The issue could also stem from physical damage within the door itself, such as broken rods or connectors that have deteriorated over time. A thorough inspection can reveal such damage, necessitating repairs or replacements.

Environmental Factors:

Exposure to harsh conditions, such as moisture, extreme temperatures, dust, and debris, can infiltrate the actuator housing and cause corrosion, rust, and other damage. Sealing potential entry points, periodic cleaning, and rust prevention measures can help mitigate these issues.

Regular Maintenance:

To prevent issues and ensure the smooth functioning of your car's locking system, regular maintenance is essential. This includes cleaning and lubricating your car door locks periodically to prevent dirt buildup and corrosion. Additionally, handle your key fobs with care and avoid exposing them to extreme conditions to extend their lifespan.

Remember, if you're unsure or unable to resolve the issue yourself, seeking professional help from a locksmith or mechanic is always a good idea.

Frequently asked questions