System components
GF20.40>W>5010H
Radiator shutters, component description
20.7.11
MODEL 963, 964 with CODE (M7K) Radiator shutters
W20.00
>
1062
>
79
Shown on model 963 with code (S1l)
Proximity Control Assist
1
Slats
A54
Lower radiator shutters controller unit
A55 m1 Upper radiator shutters actuator
motor
A55 t1
Voltage converter 24 V/14 V
A54 m1 Lower radiator shutters actuator
motor
A54 t1
Voltage converter 24 V/14 V
A55
Upper radiator shutters controller
unit
Location
The radiator shutters, consisting of the lower radiator shutters
controller unit (A54) and the upper radiator shutters controller
unit (A55) are located behind the respective radiator grille.
Task
The lower radiator shutters controller unit (A54) and the upper
radiator shutters controller unit (A55) control the throughflow of
air in the engine compartment via the position of the slats (1). The
drag coefficient of the vehicle is optimized by controlled slat (1)
opening and closing, since the air flow is led around the vehicle.
The warm
>
up phase of the engine can also be influenced via the
position of the slats (1).
Design
The lower radiator shutters controller unit (A54) consists of the
following components:
f
Lower radiator shutters actuator motor (A54 m1)
f
Voltage converter 24 V/ 14 V (A54 t1)
The upper radiator shutters controller unit (A55) consists of the
following components:
f
Upper radiator shutters controller unit (A55 m1)
f
Voltage converter 24 V/ 14 V (A55 t1)
Function
The lower radiator shutters controller unit (A54) and the upper
radiator shutters controller unit (A55) are actuated by the drive
control control unit (CPC) (A3) using digital switching signals via
the radiator shutters LIN (LIN 5). The digital switching signals are
forwarded by the voltage converter 24 V/ 14 V (A54 t1) and the
voltage converter 24 V/ 14 V (A55 t1) in the form of direction of
rotation commands (voltage reversal) to the lower radiator
shutters actuator motor (A54 m1) and the upper radiator shutters
actuator motor (A55 m1). The slats (1) of the lower radiator
shutters controller unit (A54) and the slats (1) of the upper
radiator shutters controller unit (A55) are opened or closed in
accordance with the request from the drive control control unit
(CPC) (A3).
i
The operating voltage of the lower radiator shutters actuator
motor (A54 m1) and the upper radiator shutters actuator motor
(A55 m1) is designed to be U = 12 V. The on
>
board electrical
system voltage (U = 24 V) is reduced accordingly by the voltage
converter 24 V/ 14 V (A54 t1) and the voltage converter 24 V/ 14 V
(A55 t1).
Variants
The design of the lower radiator shutters controller unit (A54) and
the upper radiator shutters controller unit (A55) varies according
to the model and the equipment:
f
Vehicles with ground clearance of 600
f
Vehicles with ground clearance of 765
f
Vehicles with Proximity Control Assist
(with code (S1l) Proximity Control Assist)
i
Introduction of engine OM 471 and exhaust aftertreatment
>
09/2011
>
109
– This printout will not be recorded by the update service. Status: 09 / 2011 –
