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Auto Tech Line

Khalid Ibrahim 0795 1029 420

Renault-key-card-2 Renault

> The hands-free card also called “badge”, is able to replace both the traditional remote control locking command and the ignition key. When the driver is carrying the card, you only needs to place your hand on the door handle to unlock the car. you don't even need to take the card out of his pocket or bag.

The card is equipped with a memory for vehicle and user data

For each driver, the position of the seats is memorised, as are

other comfort elements such as air conditioning or car radio


As well as a transponder, the hands-free card contains electronic features for low-frequency communication.

To ensurethis radio link, the car contains several aerials dissimulated in

the external door handles or in the roof trim. When the

infrared sensor on a door handle is solicited, the computer

emits a series of very short encoded bursts. When the card

detects this emission, it sends back a code to signal its presence.

An encrypted dialogue is then set up between the computer and the card.

These two elements identify themselves

to each other through a complex exchange of digital messages.

Both the computer and card contain encryption algorithms based on mathematical operations.

To check that the card is indeed the one attributed to the car,

the computer sends a number to the card. At the same time,

it calculates the reply to be sent using its own algorithm and encryption key.

On receiving the number, the card calculates a result in turn

and transmits it to the computer. As the card and the computer have the same algorithm and the same key,

the two results must be identical. If they are, the computer is certain that

it has identified the card. This dialogue only takes 80 milliseconds.

Door unlocking and engine starting are then authorised. In order to prevent accidental unlocking if the user

remains near the car, this operation is only effective if the user takes hold of one of the door handles.

The system detects this gesture using infrared sensors located in the handles and authorises unlocking.

The command to lock the

doors is given either when the user orders it by means of the remote control,

or on some vehicles when the distance separating the card from the vehicle is too great for the radio link

to operate. In this case, the computer detects an “absence of response from the card”.

To start the engine, the computer dialogues again with the card to confirm its presence in the passenger compartment. If

such is the case, the engine is started by pressing the “start” button.

Hand-free key card

the hands-free card starting

the car can only be started when the card is detected in the passenger compartment. you doesn’t even need to take the card out of pocket or bag

When you have the card with you just pres the start button to star the vehicle

Once the vehicle detects the presence of the card,

and after checking that it is one of the card Once again,then car will start.

When you leave the car,and you switched off it is just as easy

and natural to lock it. just presses the button on the

door handle and the computer commands locking of all the

car’s closures. Finally, there are buttons on the card for manual access to locking and unlocking of the doors and boot.

Here, the card acts like a conventional remote control.

Here are some of the ways of deactivating the immobiliser:

Pressing the remote button on the key.

 This is for earlier cars and vans. Turning the key in the ignition. This is for earlier cars and vans. Inserting the key card into the slot on the dash. This is for newer vehicles. Bringing the key card into the car. This is for newer vehicles equipped with proximity sensors. When attempting to diagnose a non starting vehicle, it is important to understand what sort of immobiliser your car has, and so what the correct procedure for turning it off, is. I.e. if the immobiliser is controlled by putting the key in the ignition and turning to position II, then it doesn't matter if the doors unlock from the one button remote, what matters is that the red light stops flashing when you turn the ignition to position II.

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