In this chapter we would like to take as an example the ignition key with the 3-button radio remote control (folding key) of the Volkswagen Group for the vehicle makes Skoda, Volkswagen and Seat. This vehicle key allows the vehicle to be opened and locked both mechanically and also via radio signals.
Modern vehicle access systems consist of individually and compatibly programmed radio transmitter keys and receivers. An active button control on the remote control enables a range of comfort functions to be thus activated in the vehicle. The radio remote control signals are sent to the electronic control unit for access and ignition authorisation in the comfort system of the vehicle and are subsequently evaluated. If identification is positive, access to the vehicle is granted and the doors are unlocked. We would now like to take as an example the ignition key with the 3-button radio remote control (folding key) of the Volkswagen Group for the vehicle makes Skoda, Volkswagen and Seat. This vehicle key allows the vehicle to be opened and locked both mechanically and also via radio signals.
Unfold the key bit. Separate the lower section of the key from the hand-held radio transmitter. Place a screwdriver in the gap between the two halves of the housing and lever apart.
Position the key bit between the upper and lower part of the housing and lever apart.
Remove the battery from the housing. Insert new battery, ensure polarity is correct. Reassemble the vehicle key in reverse order.
If an additional, new, hand-held radio transmitter is required or needed as a result of loss or a defect, then this transmitter has to be programmed or "taught" in the vehicle from scratch. All vehicle keys including hand-held radio transmitters and also a suitable diagnosic unit make up the equipment required for the carrying out of such programming or "teaching". All the hand-held radio transmitters that have already gone through the learning process for the vehicle will have their programs deleted by this new programming.
The learning process will now be illustrated by using the example of a mega macs 77 diagnostic unit
Taking one vehicle key, separate the housing section with the key bit and the transponder from the hand-held radio transmitter. Place a screwdriver in the gap between the two halves of the housing and lever apart.
Enter vehicle data in the diagnostic unit. Connect the diagnostic unit with the on-board communication interface.
Insert the lower section of the housing with the key bit and the transponder in the ignition lock and switch on ignition. Then close the driver's door but leave the window open.
Within 15 seconds of this prompt, the unlock button on every key to be programmed has to be pressed one after the other (
Picture 5
).
The signal recognition and also the programming of each individual hand-held radio transmitter are then acknowledged by a quick flashing of the direction indicators (
Picture 6
)
After all the hand-held radio transmitters have been activated, input in the diagnostic unit has to be finally confirmed. When all input has been successfully completed, confirmation will be given by the diagnostic unit.
Following completion of programming, fit together all vehicle keys and check each one to see that all remote control key functions are in good working order.
