Keyless Entry Transmitter: Description and Operation

Transmitter key
An infrared transmitter with transmitter window (a), a pushbutton for operation (b), a battery compartment (c) with 4 batteries (transmitter key up to 09/93) or 2 batteries (transmitter key as of 10/93) and a folding 4-track key (d) are accommodated in the key head. The key can be folded out by operating pushbutton (e).
If a transmitter key is lost, it can be ordered via the usual channels by stating the locking mechanism number.
Up to 8 transmitters can be adapted to a locking mechanism by the manufacturer.
The folding key in the transmitter is replaceable. If transmitter button (b) is operated continuously, the transmitter switches off after approx. 30 s in order to prevent the batteries from discharging. As of 10/93, the volume of the transmitter key was reduced by approx. 40 %. It is not possible to replace the mechanical key shank of a transmitter key up to 09/93 in a transmitter key as of 10/93.

Infrared spare key and also secondary key function
As of about 05/95 the customer is supplied with an infrared spare key in addition to his two infrared transmitter keys (except (USA) (J)). With the introduction of this infrared spare key, the spare batteries for the infrared transmitter keys which were enclosed in the car document wallet with the introduction of the driver authorization system stage 2, are now discontinued. The infrared spare key can also be obtained for older models with infrared remote central locking through Central Parts Depot Germersheim.






The spare key (2) has the size of a check card. The spare key can be used to operate the central locking and also the anti-theft alarm system. In addition, the drive authorization system is activated or deactivated by means of the infrared signal. It is not possible to operate the convenience feature The spare key (2) houses an infrared transmitter, a pushbutton (b), an LED (a) as a battery check, a battery compartment with two batteries and a mechanical master key (d). The infrared beam is emitted in the middle of the front side of the spare key when the pushbutton (b) is operated.






Spare keys are identified by a code number (3) in this example (stamped on the rear).

To replace the two batteries (f), press in the catch (arrow) and lift off the battery compartment cover (c) of the spare key (2). The same batteries as in the normal infrared transmitter key are used.

NOTE: If need be, the mechanical master key (d) can be replaced by a mechanical secondary key. This can be obtained from the Central Parts Depot Germersheim. The mechanical secondary key cannot be used to operate the lock cylinders of the trunk lid and glovebox. The customer therefore can take advantage of the known benefits when the car is in a workshop or when staying at a hotel.