20 Trailblazers Lead The Way In Fiat 500 Keys
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A dead battery for the coin is the most common reason for a key fob malfunction. Other causes include water damage, an inoperative receiver module, and signal interference.
Dead Coin Battery
If your key fob battery has gone out of service, the first thing to do is replace it. Choose a button battery with the same voltage, size, and specification as your old one.
If the key fob was exposed to water (such as saltwater or rain at the beach) it must be cleaned before using again. A paper towel that has been soaked in isopropyl alcohol or electronic cleaner can how do i get a spare key for my fiat 500 the trick.
If the key fob has not been exposed to water but still does not work, there may be a problem with the receiver module or an internal electronic chip. In these cases it is possible that reprogramming the key fob using an OBDII scanner could aid.
Water Damage
You could have water damage if your key fob was submerged in a pool, puddle or washing machine. You can usually be able to get it back up and running by removing the battery and scrubbing the circuit board with isopropyl alcohol. It is best to allow the device to completely dry before installing the battery.
If your key fob has stopped working even after replacing the battery and programming it again, you might have a problem with the receiver module. You can find information on reprograming the majority of remote keys on YouTube or refer to your owner's manual. You can also try resetting the car's onboard computer by using the OBDII scan tool.
Faulty Receiver Module
The key fob is equipped with the chip that communicates the vehicle's system. If this chip becomes damaged, it can no longer transmit and receive signals to the vehicle. A key fob falling off can result in this, as can water exposure. If the key fob stopped working after exposure to water, it may be possible to repair it by cleaning the chip with isopropyl alcohol or an electronic cleaner.
However, if the key fob is still unable to not respond after cleaning it, it is likely that the component is damaged and must be replaced. A defective receiver can cause the key to cease to function. This is usually caused by electromagnetic interference.
Electronic chip that is malfunctioning
The chip that is embedded in the key fob is an important component of the anti-theft systems in your car. It sends a signal to the immobiliser unit inside the vehicle to determine whether the key is in fact valid. Your car will not start if the chip is damaged.
A defective chip can be caused by interference signals from other objects such as weather conditions, objects or transmitters operating on the same frequency as your car. In this instance an upgrade to the fob will be required.
Contacts of the battery may be damaged.
The battery contacts on the fob's battery can be damaged due to heavy use. If they are bent, or broken, the fob won't transmit any signals to receiver modules inside the vehicle.
Modern fobs are designed with rubber seals that keep out water. A splash of water or a light rain should be fine However, submerging them in saltwater may harm the electronic chip.
The key fob is equipped with an electronic chip that communicates with the vehicle's immobilizer to allow it to start it. This system makes use of cryptocoding systems in vehicles that are more modern as well as the traditional red key system for older models. This chip will have to be replaced if it's damaged.
Problematic 12 Volt Battery
A damaged battery could cause the key fob to work. If this happens the car's computer will not recognize that the remote is within the vehicle.
Before you replace the battery, test it with an voltmeter for determining its capacity. A fully charged battery should read 12.6 volts. If the reading falls significantly it's time to change it.
Install an electrical charge for a few moments on the battery to determine its capacity. This will remove about 1 percent of the charge on the surface. After that, measure the voltage. The longer the battery can keep its voltage steady greater is its capacity. Ideally, it should remain at 12 volts or less for several minutes.
Faulty Radio Signal
This is the most common reason for the key fob not sending signals to cars. This issue can be resolved by replacing the battery. It is important to buy batteries that have the same dimensions and voltage as the original.
Fobs are subject to a lot of abuse, but they're not impervious to destruction. The battery contacts and buttons are delicate and can be bent or damaged from excessive use.
A signal can also be affected by other objects or transmitters that operate on the same frequency. For instance, a light-control panel near your home may transmit interference using the same frequency that spare key fiat 500 fobs utilize. This could affect the remote control in your car.
Problems with OBDII Scan Tool
There are a number of reasons why a scan tool could not function. Certain are more complicated than others.
Professional scan tools enable mechanics to observe the car's networks and run various self-tests. These tools can help save time, but are costly and out of reach for the majority of DIYers.
If your OBD2 scanner isn't turning on examine the voltage at terminal 16 (scan tool power) and terminal 4 (chassis ground). If these are OK it's possible that a fuse has failed. This is one of the most common causes of failures in the scan tool. The easiest solution is to replace the fuse that has been blown.

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