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fiat van Keys Panda keyfobs are equipped with a transponder that sends a signal from the fob to the car that allows it to unlock doors or start the motor. The fob might stop working for a variety of reasons.
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Dead Coin Battery
If your key fob battery has died, the first thing to do is replace it. Use a button cell battery with the same voltage, size, and specifications as the old one.
If the key fob has been exposed to water, such as a splash of rain or salt water at the beach, it will have to be cleaned before it can be used again. A paper towel that has been soaked in isopropyl alcohol or electronic cleaner will be the solution.
If the key fob isn't working despite not being exposed water it could be due a malfunction in the receiver module or an internal electronic chip. In these cases it is possible that reprogramming the key fob with an OBDII scanner may help.
Water Damage
If your key fob took immersed in a pool or puddle or even a trip through the washing machine, you could be suffering some water damage. It is usually possible to fix it by taking out the batteries and cleaning the circuit board with ruby alcohol. It's best to let the circuit board completely dry prior to installing a battery.
There could be a problem with the module in the event that your remote stops working after replacing the battery or updating. You can find instructions for reprograming the majority of remote keys on YouTube or consult the 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's chip is a chip which communicates with the vehicle's system. This chip will stop sending and receiving signals to the car if it becomes damaged. A key fob falling off can cause this, as well as water exposure. If the key fob stops working after exposure to water, it could be possible to repair it by cleaning the chip using isopropyl alcohol, or electronic cleaner.
However, if the key fob is still unable to not respond after cleaning it, there is a good chance that the component is damaged and will require to be replaced. A damaged receiver module may also cause the remote control key to not function. This is usually due to electromagnetic interference.
Faulty electronic chip
The electronic chip in the key fob is a crucial element of the anti-theft device in your vehicle. It transmits a message the immobiliser in your car that tells it if the key is valid. If the chip is damaged or broken, your car will not start.
A damaged chip could be caused by interference signals from other objects like bad weather conditions or transmitters on the same frequency near your vehicle. In this scenario, a new fob will be required.
Contacts with the battery may be damaged.
The battery contacts on the fob's key can be damaged by excessive usage. If they are bent, or damaged, the fob will not send any signals to receiver modules inside the vehicle.
Modern fobs come with rubber seals that block out water. A splash of water or a light rain is acceptable, but submerging them in saltwater can cause damage to the electronic chip.
The key fob has chips that communicate with the vehicle's immobilizer system in order to activate it. It uses the red keys of older vehicles or the crypto coding system in newer vehicles. If the chip is damaged, it will need to be replaced.
A faulty 12 Volt battery
A faulty battery can cause the key fob to cease working. When this happens the car's computer won't recognize that the remote is in the vehicle.
Before you replace the battery, test it by using a an voltmeter for determining its capacity. A fully charged battery should read 12.6 volts. If the reading decreases significantly then it's time to replace the battery.
Set an electrical load for a few moments on the battery to check its capacity. This will take off approximately 1% of the charge on the surface. Then, test the voltage once more. The better the battery's capacity and the longer it can maintain its voltage. Ideal is that it stays close to 12 volts for several minutes.
Faulty Radio Signal
This is the main cause of a key fob that stops sending signals to the car. The issue can be fixed by replacing the battery. However, it is important to choose a battery that has the same size and voltage as the original one.
The buttons are not impervious to destruction and can be damaged by a lot. Contacts and buttons on batteries can be damaged by rough handling.
The signal could also be disrupted by other transmitters or objects which use the same frequency. For example, a light-control panel close to your home can send interference on the same bandwidth that key fobs utilize. This can affect the remote control of your car.
Faulty OBDII scan tool
There are many reasons scanners don't work. Some are more complex than others.
Professional scan tools enable mechanics to monitor the car's network, and run various self-tests. These tools can save a lot of time, but are expensive and out of reach for most DIYers.
If your OBD2 scanner won't start, check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If all is fine the fuse could have blown. This is one of the most common causes of a scan tool failing. The easiest fix is to replace the blown fuse.
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