Keyless Entry Transmitter: Description and Operation

GF80.57-P-6010RT Transmitter Key, Component Description

Component Identification:

Design
The transmitter key consists of an electronic component and a mechanical key. The electronic key includes an FM radio transmitter, an infrared transmitter/receiver, a computer chip and control buttons as well as two button cells.The mechanical key can be unlocked and removed with the unlocking slider

Function

Lock central locking (CL)
Actuate "Lock" transmit button:
^ Press once (locking CL globally)
^ Press and hold down while pointing at IR receiver (convenience closing)

Unlock central locking (CL)
Actuate "Unlock" transmit button:
^ Pressing once when set to "Selective" (driver door and fuel filler flap are unlocked)
^ Pressing twice when set to "Global" (unlocks all)
^ Pressing twice when set to "Selective" (unlocks all)
^ Press and hold down while pointing at IR receiver (convenience closing)

With USA version, code 494 two IR receivers are installed: Left front IR receiver (A26/1) and right front IR receiver (A26/2).

Switches unlocking from "selective" to "global" or vice versa
^ Hold "Lock" button and "Unlock" button simultaneously for approx. 5 s until the "Battery control" LED flashes twice.

Panic alarm
With radio remote control with panic switch, code 763 Actuate "Panic alarm" transmit button:
^ press approx. 2 s (to trigger panic alarm)
^ press approx. 0.5 s (to terminate panic alarm)

Open/close rear-end door transmit button (RWTS)
Actuate open/close rear-end door transmit button (RWTS)
^ press approx. 0.5 s (trunk lid opens/closes)

Drive authorization stage 3 (DAS 3)
When the transmitter key is inserted into the EIS control unit it is supplied with power via an induction coil Data is exchanged via the infrared transmission and receiving unit for the purpose of verifying drive authorization.

Unlock or lock vehicle doors or unlock rear-end door
When the transmit button is pressed, a radio signal is transmitted by the transmitter key.Parallel to the radio signal, an infrared signal is transmitted to the IR receiver If the signal is valid, the vehicle doors are unlocked or locked and the rear-end door is unlocked

Mechanical key
The mechanical key can be removed from the transmitter key after actuating the unlock slider.When the driver door is unlocked with the mechanical key, the CL is not actuated.

On vehicles with anti-theft alarm (ATA), code 551, the latter is not disarmed

Convenience feature (CF)
The signals for convenience actuation are only transmitted via infrared, not via radio.

Battery check
When the transmit button is actuated, the LED "Battery check" comes on momentarily and indicates the proper state of the batteries (two button cells) in the transmitter key.

Panic alarm
With radio remote control with panic switch, code 763
When the "Panic alarm" transmitter button is pressed for approx. 2 s, the panic alarm is started; the panic alarm is interrupted when the transmitter button "Panic alarm" is reactuated or when the transmitter key is inserted in the key opening on the EIS control unit.

Keyless go (KG) (with keyless go, code 889)
Communication with the vehicle via inductive signals and radio signals. Determine request location in relation to vehicle.