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The Ultimate Glossary Of Terms About Fiat 500 Keys
Fiat Panda Key Fob Replacement

Fiat Panda key fobs contain an transponder chip that transmits the signal to your vehicle to open the doors or start the engine. The fob could stop working due to a variety of reasons.

The most common cause of key fob failure is a dead coin battery. Other causes are water damage, a faulty module, and interference signals.

Dead Coin Battery

Replace the battery if your key fob has gone out of service. Make use of a new button battery with identical in size, voltage and specifications as the previous one.

If the key fob has been exposed to water, for example a splash of rain or salt water on the beach, it's going to need to be cleaned before it can be used again. The trick is to use the paper towel and soak it in isopropyl or an electronic cleaner.

If the key fob has not been exposed to water, but isn't working it could be due to a problem with the receiver module or an internal electronic chip. In these situations it is possible to re-programme the key fob using an OBDII scanner might aid.

Water Damage

There could be water damage if your key fob was submerged in a puddle, pool or washing machine. It is usually possible to restore it's functionality by taking off the battery and then scrubbing the circuit board with isopropyl alcohol. It is recommended to let the board completely dry before installing batteries.


If your key fob has stopped working even after replacing the battery and changing the program, you could have a malfunctioning receiver module. You can find instructions for the reprogramming of most remote keys on YouTube, or consult the owner's manual. You could also try resetting the car's onboard computer using the OBDII scan tool.

Faulty Receiver Module

The key fob's chip is a chip that communicates with the car's system. If this chip becomes damaged, it can no longer transmit and receive signals to the vehicle. The key fob being dropped can result in this, as can exposure to water. If the key fob stopped working after water exposure it may be possible to repair it by cleaning the chip with isopropyl ethanol or electronic cleaner.

If the key fob won't respond to cleaning, it is possible that the module has issues and needs to be replaced. A malfunctioning receiver could cause the key to stop working. This is usually caused by electromagnetic interference.

Faulty Electronic Chip

The chip inside your key fob plays a vital role in the anti-theft system of your car. It sends a signal to the immobiliser in your car to inform it that the key is valid. The car will not start if the chip is damaged.

A damaged chip could be caused by interference signals from objects such as weather conditions, objects or transmitters on the same frequency in close proximity to your vehicle. In this situation it is likely that a new fob would be required.

Contacts with the battery may be damaged.

The battery contacts on the fob's key can be damaged by heavy usage. If they're bent or broken, the fob won't send any signals to receiver modules inside the vehicle.

Modern fobs feature rubber seals to keep out water. Submerging them in water even if it is just small splash or drizzle, can damage the electronic chip.

The key fob has an electronic chip that communicates with the immobilizer system of the vehicle to begin it. This system utilizes cryptocoding systems in modern vehicles or the red key system for older models. This chip will need to be replaced if it's defective.

Problems with 12 Volt Batteries

A faulty battery can cause the key fob to stop working. When this happens, the car's computer system will not be able to recognize that the remote is inside the vehicle.

Test the battery using the voltmeter before replacing it to determine its capacity. A fully charged battery should read 12.6 volts. If the reading falls significantly it is time to replace the battery.

To determine the capacity of a battery, place an electrical load on it for a couple of minutes. This will remove 1% of the surface charges. Then, you can measure the voltage once more. The longer a battery is able to hold its voltage greater is its capacity. Ideally, it will remain close to 12 volts for several minutes.

Faulty Radio Signal

This is the most common reason behind a key fob that stops sending signals to the car. The issue can be fixed by replacing the battery. It is however important to purchase a battery that has the same size and voltage as the original one.

Fobs endure a lot of abuse, but they're not impervious to destruction. The battery buttons and contacts are brittle and are susceptible to being bent or damaged by excessive use.

A signal may also be interrupted by other transmitters or objects that use the same frequency. A light control panel in your home, for example, may interfere with key fobs using the same bandwidth. This can interfere with the remote control of your car.

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There are many reasons why a scanner could not function. Some are more complicated than others.

Professional scan tools allow a mechanic to observe the car's networks and conduct a variety self-tests. These tools can help save time, but are costly and out of reach for most DIYers.

If your OBD2 scan tool won't power on, check the voltage at the terminals 16 (scantool power) and 4 (chassis earth). If both are in good condition it could be that a fuse has ruptured. This is one of the most frequent reasons for failure of the scanner. It is typically easy to fix the problem by replacing the fuse that was blown.