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How to Fix Rolls Royce Dawn Key Fob Problems There are very few cars that provoke the sort of involuntary gasp that the Rolls-Royce Dawn does. Even with the cloth roof down, it's still an impressive car. It is equipped with all the classic features – such as motorised doors that close at the push of a button as well as umbrellas concealed in the door opening. It is equipped with a smooth V12 engine which can be driven in almost silence. Dead Coin Battery The most frequent reason for a key fob to not lock or unlock the doors is a dead coin battery. It is also one of the simplest to fix because it can usually be replaced in just a few minutes. To avoid getting a faulty coin battery, always use a new battery that is the same voltage, size and specifications as the original one. Never use a battery exposed to clean water, such as rain, clean tap water, or even soda, since this could damage the internal chip. If the key fob doesn't work after reprogramming it with an original key, go to an authorized dealer. Other reasons that the key fob might not be working are water damage, receiver Module Issues, Signal Interference or a Bad Electronic Chip. Poor Battery Contact The button cell battery inside the key fob of your Rolls Royce Dawn can lose its charge and cease to function. Replacing the battery is a fast and simple fix. Make sure you replace the battery with one that is the same size and voltage. Contact the auto parts store if you aren't sure what type of battery to purchase. The corrosion on the terminals of the batteries in a Rolls Royce Dawn may also hinder it from starting. This issue is common with older batteries, particularly when they haven't been charged for a long amount of time. To ensure that your battery's terminals aren't corroded, you can use a multimeter to check the conductivity. Set the meter to ohms, and use one of its probes to connect to the negative terminal in your Dawn. Place the other probe on a metal surface of the engine or chassis. The reading should be near zero ohms. Another symptom of a weak battery in your Dawn is clicking noise when you try to start the engine. This is due to the starter solenoid, the accessories and the engine require low current while the starter solenoid demands high current. Water Damage If you've accidentally dropped your Rolls Royce Dawn key fob in the sink or left it in the rain, it's probably suffering from water damage. The chip's electronic circuit is protected by rubber seals but prolonged exposure to clean water or salty ocean water could cause it to cease functioning. Moisture can cause corrosion over time, which can lead to faulty circuitry that can cause issues with the ignition and security system of your vehicle. It also can interfere with the transmission of signals, causing the remote keyless system to fail. The key fob could lock your car or activate the immobiliser, leaving you stranded. To avoid this, take the key fob from its case and wipe it down with a the help of a damp towel to get rid of any moisture. You can also place the key in a bag with uncooked silica gel or rice to absorb any moisture. Once dry the key should function normally again. If not, the issue is likely to be with the 12 volt battery, or the receiver module, which needs reprogramming to fix. Receiver Module Issues If you've tried a new battery but the remote key fob isn't working, it could be time to replace the receiver module. The receiver module receives radio frequency signals from your key fob, and converts them to commands for the vehicle's electronic system. If the chip inside the module is damaged, it won't be in a position to communicate with other modules in the vehicle. To determine the cause you'll require an OBD scanner that will determine what the on-board computer is telling it to do. The battery in the key fob of your Dawn has metal retaining clips that hold it in place and complete the circuit. These clips can get corroded and render the battery's contacts ineffective. When replacing the battery, ensure that it's the exact same size and voltage as the original. Otherwise, it could damage the chip inside the key fob. If the key fob stops suddenly, it could indicate that it has been damaged by water. This can happen when the key fob is dropped into water or gets wet with soapy water. It is possible to clean the key fob using electronic cleaners or isopropyl alcohol, but you will need to replace the chip if it is damaged. Signal Interference Occasionally, your Dawn key fob will stop working due to signal interference. The interference could be caused by objects within the vicinity of your car or weather conditions, as well as transmitters on the same frequency band. The Key Lab could be caused by a faulty receiver module. If you're unable to eliminate the interference, you might be able to use an extender or signal booster. If the button cell battery is completely depleted, it's time to replace it. To ensure compatibility with your vehicle, the battery should have the same size and voltage as the original. If your key fob starts to work intermittently, it could mean the chip is fried. If you've tried the above suggestions but still aren't able to get your key to open or lock, it's likely time to contact an experienced locksmith. A reputable locksmith will be able assist you with any Rolls Royce key fob or key programming needs, such as reprogramming and replacement. They'll be able to give you a quote for the work that is needed. Make sure you ask the locksmith about their rates and credentials before hiring them. Dead 12 Volt Battery The 12 volt battery inside your Rolls Royce Dawn is responsible for providing high electric current not only to start the engine but also to supply power to all accessories as well as on-board computers. If the battery is dead, or the current flow to the engine is disrupted because of corrosion on the battery terminals or ground connection, all on-board electronics including the remote keyless system will stop functioning. A multimeter can be used to determine the conductivity of your Dawn battery. To perform this test, disconnect the negative cable from the battery, and then touch one probe of the multimeter to the ground wire of the battery and the other probe to any exposed metal component of your vehicle's engine body or chassis. The reading should be zero ohms or close to it. If the results are not satisfactory then replace the battery with an alternative battery that has the same size, voltage and specification. Make sure the replacement is fully charged prior to use it. The most common reason for an unreliable battery is internal degeneration due to the aging process. However, it can be caused by an unnatural draw or if your vehicle has been left parked for a prolonged period.