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Saturday, 3 October 2015

Keyless technology in modern automobile

The above topic was the subject of a three-day seminar conducted for hundreds of mechanics in the week gone by. The interest shown was so engaging I decided to look for a readable version online. The article below is culled from Wikipedia. Please read:

One of the first introductions was in 1980 on the Ford Thunderbird, Mercury Cougar, Lincoln Continental Mark VI, and Lincoln Town Car, which Ford called Keyless Entry System (later renamed SecuriCode). It was a keypad on the driver-side exterior door above the door handle. It consisted of a keypad with five buttons that when the code was entered, would unlock the driver’s door, with subsequent code entries to unlock all doors, and the trunk. Nissan offered the same technology on the Nissan Maxima and Nissan Fair lady beginning in 1984, essentially using the same approach as Ford, with the addition of being able to roll the windows down and open the optional moon roof from outside the vehicle on the door handle installed keypad on both the driver’s and front passengers door.

The remote keyless systems using a handheld transmitter first began appearing on the French made Renault Fuego in 1982, and as an option on several American Motors vehicles in 1983, including the Renault Alliance. The feature gained its first widespread availability in the US on several General Motors vehicles in 1989.

Function

Keyless remotes contain a short-range radio transmitter, and must be within a certain range, usually five to 20 metres of the car, to work. When a button is pushed, it sends a coded signal by radio waves to a receiver unit in the car, which locks or unlocks the door. Most RKEs operate at a frequency of 315 MHz for North America-made cars and at 433.92 MHz for European, Japanese and Asian cars. Modern systems implement encryption to prevent car thieves from intercepting and spoofing the signal. Earlier systems used infrared instead of radio signals to unlock the vehicle, such as systems found on Mercedes-Benz, BMW and other manufacturers.

The system signals that it has either locks or unlocks the car usually through some fairly discreet combination of flashing vehicle lamps, a distinctive sound other than the horn, or some usage of the horn itself. A typical setup on cars is to have the horn or other sound chirp twice to signify that the car has been unlocked, and chirp once to indicate the car has been locked. For example, Toyota, Scion, and Lexus use a chirp system to signify the car being locked/unlocked. While two beeps means that driver’s door is unlocked, four beeps means all doors are unlocked. One long beep is for the trunk or power tailgate. One short beep signifies that the car is locked and alarm is set.

The functions of a remote keyless entry system are contained on a key fob or built into the ignition key handle itself. Buttons are dedicated to locking or unlocking the doors and opening the trunk or tailgate. On some minivans, the power sliding doors can be opened/closed remotely. Some cars will also close any open windows and roof when remotely locking the car. Some remote keyless fobs also feature a red panic button which activates the car alarm as a standard feature. Further adding to the convenience, some cars’ engines with remote keyless ignition systems can be started by the push of a button on the key fob, and convertible tops can be raised and lowered from outside the vehicle while it’s parked.

On cars where the trunk release is electronically operated, it can be triggered to open by a button on the remote. Conventionally, the trunk springs open with the help of hydraulic struts or torsion springs, and thereafter must be lowered manually. Premium models, such as SUVs and estates with tailgates, may have a motorized assist that can both open and close the tailgate for easy access and remote operation.

For offices, or residences, the system can also be coupled with the security system, garage door opener or remotely activated lighting devices.

Programming

Remote keyless entry fobs emit a radio frequency with a designated, distinct digital identity code. Inasmuch as “programming” fobs is a proprietary technical process, it is typically performed by the automobile manufacturer. In general, the procedure is to put the car computer in ‘programming mode’. This usually entails engaging the power in the car several times while holding a button or lever. It may also include opening doors, or removing fuses. The procedure varies amongst various makes, models, and years. Once in ‘programming mode’ one or more of the fob buttons is depressed to send the digital identity code to the car’s on-board computer. The computer saves the code and the car is then taken out of programming mode.

As RKS fobs have become more prevalent in the automobile industry a secondary market of unprogrammed devices has sprung up. Some web sites sell steps to program fobs for individual models of cars, as well as accessory kits to remotely activate other car devices. Many sites provide RKS fob programming instructions for free.

On early (1998-2012) keyless entry remotes, the remotes can be individually programmed by the user, by pressing a button on the remote, and starting the vehicle. However, newer (2013+) keyless entry remotes require dealership or locksmith programming via a computer. The Infrared keyless entry systems offered user programming, though radio frequency keyless entry systems mostly require dealer programming.

Smart key

Some cars have a proximity system that is triggered if a keylike transducer is within a certain distance of the car. Sometimes called hands-free or advanced key, one of the earliest systems was found on the 1993 Chevrolet Corvette (called the Passive Keyless Entry System) and in Mercedes-Benz vehicles from 1998. Today, this system is commonly found on a variety of vehicles.

With the smart key system, a vehicle can be unlocked without the driver needing to physically push a button on the key fob to lock or unlock the car and is also able to start or stop the ignition without physically having to insert the key and turning the ignition. Instead, as approach the vehicle, the vehicle senses that the key (located in a pocket, purse, etc.) is approaching the vehicle. When the key fob is within the car’s required “bubble” distance, there are two methods typically used by auto manufacturers to unlock the doors:

  • Method 1 — Once the key holder is in the car’s “bubble” (the required distance from the vehicle for the key to be recognized) the car will automatically unlock the driver’s door.
  • Method 2 — Once inside the car’s “bubble” the car doesn’t unlock the door unless the key holder touches one of the sensors located behind the door handles. As others attempt to get in, the system senses that the driver is within the “bubble” and as they touch the sensors behind their door handles, the car will unlock their door.

In certain vehicles, there are also various functions built into the transmitter to perform various tasks. For instance, pressing the unlock button twice and keeping the button depressed on the second push allows the keyholder to roll down certain pre-programmed windows and/or the sunroof. Other functions range from turning on the headlights and various electronic equipment (factory or aftermarket). On some Toyota, Nissan and Hyundai vehicles, the system prevents the driver or passenger from accidentally locking the keys in the car, via the sensor that detects whether the keyholder is within the “bubble” area outside the vehicle.

A security key system is embedded into most modern vehicle’s keys. A small chip rests on the vehicle’s key or under the plastic key cover. When any key is inserted into the ignition, the ignition is coded. The key sends its security code to the ignition, which also has its own security code, and if the security codes match, the vehicle will start when the key is turned. However, if the key codes do NOT match, the vehicle will NOT start when the key is turned. Some early examples of this technology include Chrysler Corporation’s Sentry Key System, or General Motors’ PASSKey System. Some security keys can be programmed by the user, though most of these keys have to be programmed by a dealership or locksmith via a computer. Cannot have these keys copied at any hardware store or auto parts store.

Security

Keyless ignition does not by default provide better security. In October 2014, it was found that some insurers in the UK would not insure certain vehicles with keyless ignition unless there were additional mechanical locks in place due to weaknesses in the keyless system.

Criminals have managed to open cars by using signal boosters to trick vehicles into thinking that keyless entry fobs to their locks are close by even when they are far away. Keeping fobs in aluminium foil or a freezer when not in use can prevent criminals from doing so.

In 2015, it was reported that Samy Kamkar had built an inexpensive electronic device about the size of a wallet that could be concealed or near a locked vehicle to capture a single keyless entry code to be used at a later time to unlock the vehicle. The device transmits a jamming signal to block the vehicle’s reception of rolling code signals from the owner’s fob, while recording these signals from both of his two attempts needed to unlock the vehicle. The recorded first code is sent to the vehicle only when the owner makes the second attempt, while the recorded second code is retained for future use. Kamkar stated that this vulnerability had been widely known for years to be present in many vehicle types, but was previously undemonstrated.

NB: The technology has improved tremendously from the above explained methodology, but the essential architecture has remained the same.

I must also use this opportunity to apologise to the readers who expected their enquiries to be answered in today’s piece; the outgone weeks have been so busy for me that I couldn’t get to answer them in this edition of the column. I shall be publishing them next week. Thank you.

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Contact: editor@punchng.com



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