It depends on make and model, each manufacturer has a different procedure, although most are similar. Look in owners manual it is almosy always there because it has to be done after changing batteries in remote fob.
on the key fob, turn the key over so that the buttons are on the back. there is a small groove near the blade/key end of the fob. you can prise this open using a small screwdriver or if you're strong pull the blade/key part outward/away from the fob. the remaining key fob can then be split in two to get at the battery. beware that you only have a very short time to replace the battery or the fob will go out of sync with the car.
No, You do not need a key fob to start a car. When starting a car, you put the key in the ignition and turn. Power comes from car battery, not from the key fob battery!
You might be referring to a car key case. You could also be referring to a key fob. A key fob has built-in authentication.
A key fob is for instance a mini card on your keyring, for instance I have a tesco's clubcard key fob on my keyring therefore when I put petrol in my car and pay at the checkout instead of finding my clubcard I get my key fob!
You put the key in the ignition and turn, you don't need a fob in order to start a car.
renault megane 55 plate key fob starts car but does not lock car
Weak battery in fob?
Hold the key fob next to the start button.
It is called the key Fob.
The Key Fob for cars are the buttons, which depending on the type of car and type of Fob have to be programed a certain way.
check the battery in the car and the batteries for the fob key
It's not that the key fob stopped working, but, if your car battery is dead, it's the car that has no power to pop the door locks.