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spare fiat 500 key fob not working 500 key (from this source) Panda keyfobs are equipped with a transponder, which sends an electronic signal from the fob to the car in order to unlock doors or turn on the motor. The fob could stop working due to a variety of reasons.

The most commonly cited reason for key fob failure is an inoperable coin battery. Other causes are water damage or a malfunctioning module and interference signals.

Dead Coin Battery

Replace the battery in case your key fob has gone out of service. Make use of a new button battery that has the same size, voltage, and specification as the original.

If the key fob was exposed to water (such as rain or saltwater at the beach) It must be cleaned prior to using it again. A paper towel soaked in alcohol or electronic cleaner will help.

If the key fob has not been exposed to water but remains inoperable it could be an issue with the receiver module or an internal electronic chip. Reprogramming the keyfob through an OBDII scan could help in these instances.

Water Damage

If your key fob took submerged in a puddle or pool or even a trip down the washing machine, you could be suffering some water damage. It's usually possible to repair it by getting rid of the batteries and cleaning the circuit board with rubbing alcohol. It's best to let the fob dry completely prior to installing a new battery.

If your key fob has stopped working even after replacing the battery and programming it again, you might have a malfunctioning receiver module. There are instructions for changing the programming of most remote keys on YouTube or in your owner's manual. You can also reset the computer of your vehicle using the OBDII scanner tool.

Faulty Receiver Module

The key fob has an electronic chip that communicates with the car's system. If this chip becomes damaged, it cannot longer transmit or receive signals to the vehicle. Dropping the key fob can result in this, as can exposure to water. If the key fob you have purchased has stopped functioning due to water exposure it is possible to fix it if you clean the chip with electronic cleaner or isopropylethanol.

However, if the key fob still does not respond after cleaning it you can be sure that the component is damaged and will need to be replaced. A malfunctioning receiver module could also cause the remote control key to stop working. This is usually due to electromagnetic interference.

Faulty Electronic Chip

The electronic chip in your key fob plays a crucial role in the anti-theft security system of your vehicle. It transmits a message to the immobiliser inside your car to determine whether the key is genuine. Your car will not start if the chip is damaged.

A faulty chip can also be caused by interference signals from objects or weather conditions that are bad, or transmitters operating on the same frequency in close proximity to your vehicle. In this instance the replacement fob will be needed.

Faulty Battery Contacts

The battery contacts in a key fob are very delicate and can get damaged through repeated use. If they are bent, or broken, the fob won't transmit any signals to receiver modules inside the vehicle.

Modern fobs are constructed with rubber seals in order to keep out water. A splash of water or light rain is acceptable However, submerging them in saltwater may damage the electronic chip.

The key fob is equipped with a chip which communicates with the immobilizer system of the vehicle in order to start it. It uses the old red keys for older vehicles, or the cryptocoding system found in newer vehicles. The chip must be replaced if it's damaged.

The 12 Volt Battery is faulty

A damaged battery can cause the key fob to cease working. If this happens the car's computer cannot recognize that the remote is in the vehicle.

Before you replace the battery, test it using a the voltmeter to determine its capacity. A fully charged battery will read 12.6 volts. If the reading decreases significantly it is time to replace the battery.

Place an electrical load for a few seconds on the battery to determine its capacity. This will eliminate 1percent of the surface charges. Then, test the voltage again. The higher the capacity of the battery, the longer it can keep its voltage. Ideally, it will remain at 12 volts or less for several minutes.

Faulty Radio Signal

This is the most frequent reason for the key fob to stop sending signals to the car. The battery is able to be replaced to resolve this issue. It is crucial to buy batteries that have the same dimensions and voltage as the original.

Fobs are not indestructible and can take a lot. The battery buttons and contacts are brittle and are susceptible to being bent or damaged from rough usage.

Other objects or transmitters using the same frequency can also interfere with the signal. For instance, a light-control panel that is near your home could send interference on the same bandwidth that key fobs utilize. This could interfere with the remote control of your car.

The tool is not working properly. OBDII scan tool

There are many reasons why scanners may not function. Some are more complicated than others.

Professional scan tools allow mechanics to monitor the car's network and perform a variety of self-tests. These tools can help save time, but are costly and out of reach for most DIYers.

If your OBD2 scan tool doesn't turn on, make sure you check the voltage at terminals 16 (scantool power) and 4 (chassis earth). If all is fine the fuse could have ruptured. This is the most frequent reason for failures of the scanner. The most straightforward fix is to replace the fuse which has blown.