The radiator mascot can be extended and retracted by:
A manually retracted (pressed in by hand) radiator mascot can be extended electrically by operating the radiator mascot (TKF) button twice.
The CAS Car Access System contains the functions of the remote control, the ignition starter button, the terminal control and the immobiliser. The CAS is also the gateway module between the data buses K-CAN SYSTEM and K-CAN PERIPHERALS.
Data exchange between the control units of the body area runs across the K-CAN PERIPHERIE data bus. Information is exchanged by means of data telegrams.
The K-CAN SYSTEM data bus is the data connection between the radiator mascot control and the control units in the chassis and suspension, drive and body sections. Information is exchanged by means of data telegrams.
The radiator mascot control comprises the automatic radiator mascot functions, a voltage regulator and the power stage for the electric motor of the radiator mascot lifting mechanism as well as current detection. Information is sent from the radiator mascot button (TKF), the radiator mascot switch (SKFA) as well as across the K-CAN PERIPHERIE data bus. The voltage supply is secured by the power module. The radiator mascot control comprises the operating states:
Normal operation: All functions are available without restriction.
Sleep mode: The sleep mode is assumed after 10 s bus rest. The processor is wakened by button or switch and K-CAN bus activity.
Service modes: The transport, production, service, and power-down modes can only be activated or deactivated by telegrams via K-CAN bus.
The automatic radiator mascot functions switch (SKFA) can be used to switch on the automatic radiator mascot functions: switch open = automatic; switch closed = manual. The switch is fitted in the glovebox on the left-hand side.
The radiator mascot button (TKF) is used to manually extend and retract the radiator mascot. Touching the button (which switches to earth) triggers a function. The radiator mascot button (TKF) is fitted in the glovebox on the left-hand side.
The radiator mascot mechanism is driven by a reversible electric motor.
The radiator mascot is extended or retracted by pressing the radiator mascot button (TKF). The radiator mascot is always moved all the way to the end position. In the end position, the drive is automatically switched off. The direction of movement changes with every press of the button.
The automatic radiator mascot functions are networked with the Car Access System (CAS) control unit via the data bus K-CAN PERIPHERIE. Independent of operation of the radiator mascot button (TKF) in the automatic function, the radiator mascot is only extended or retracted with central double-locking/unlocking (ZS/ER) using the remote control (FBD) and if the door lock is operated.
As of terminal R, the position taken up using the automatic radiator mascot functions is overridden by the radiator mascot button (TKF) and the FBD button.
An alarm contact is fitted to the lifting mechanism of the radiator mascot. If the radiator mascot is moved and the mechanical lowering triggered, the alarm contact is opened. The signal is read in by the Car Access System (CAS) parallel to the engine-bonnet contact and the anti-theft alarm (DWA) is triggered.
The electric motor is activated with (codable) PWM signals. The motor speed can be changed using the PWM function. Changing the motor speed influences the speed of movement of the radiator mascot. The motor direction is changed by means of a relay. The electric motor is activated in any direction until it blocks. The voltage is then switched off by means of a current detection circuit.
A manually retracted (pressed in by hand) radiator mascot can be raised electrically by pressing the radiator mascot (TKF) button. As the radiator mascot control (KFS) remembers the last operation, pressing the button always initiates the opposite direction of movement. When an extended radiator mascot is lowered manually, the next operation of the radiator mascot button (TKF) has the effect that the electrical lowering mechanism follows on from the manual lowering mechanism. The radiator mascot is thus in the electrically lowered state. To extend the radiator mascot, the radiator mascot button (TKF) must be operated again.
To prevent overheating of the electric motor, a (codable) anti-repeat circuit is present. If the total running time of the electric motor > 120 seconds, no new activation is accepted. An action that is running, however, is completed. After a certain time, the activation is enabled once again. If the anti-repeat period plus a waiting period of 30 seconds is not reached, a new action can be started. After a cooling-down period of 6 minutes, a successive motor running time of 120 seconds is possible.
Function lock: With starter motor operation (terminal 50), voltage < 9 V and temperature < - 30 °C, extension and retraction of the radiator mascot is prevented. When the block condition does not apply, the initiated motion is completed. The threshold values for undervoltage and temperature can be coded. If the signal is permanently present due to a sticking radiator mascot button (TKF), there is no reaction when terminal 30 is set.
For the self-diagnosis, exchange of information with the diagnosis unit is via the Car Access System (CAS) and the central gateway module (ZGM). Data communication is across the K-CAN PERIPHERIE data bus.