CL 550 4MATIC (216.386) V8-5.5L (273.961) (2009)
Relay Box: Description and Operation
GF54.21-P-6070LE Front SAM Control Unit With Fuse and Relay Module, Component Description
GF54.21-P-6070LE Front SAM Control Unit With Fuse And Relay Module, Component Description
Component Identification
Location
The front SAM control unit is located on the left of the engine compartment in the control unit box.
Task
The front SAM control unit has the following tasks:
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Reading in of sensors, pickups and signals
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Evaluation of input factors
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Control of systems
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Actuating components
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Voltage supply to components
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Switching consumers using relays
Reading in of sensors, pickups and signals
The input factors are read in with the following connections:
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Direct line
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AC bus (KB)
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On-board electrical system LIN (LIN B7)
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Interior CAN (CAN B)
Direct line
The signals from the following components are read via a direct line:
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Refrigerant pressure sensor (B12)
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Outside temperature indicator temperature sensor (B14)
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Hall sensor of steering column in/out motor (M20/1)
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Hall sensor of steering column up/down motor (M20/2)
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Left rear center air outlet potentiometer (R41/4r1)
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Right rear center air outlet potentiometer (R41/4r2)
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Right front brake pad contact sensor (S10/2)
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Brake fluid indicator switch (S11)
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Coolant level indicator switch (S41)
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Windshield washer system fluid level indicator switch (S42)
AC bus
The signals from the following components are read in via the AC bus:
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AAC multifunction sensor (B31/1)
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AAC [KLA] 4-way sun sensor (B32/2)
The refrigerant pressure sensor, AAC (KLA) multifunction sensor and the AAC [KLA] sun sensor (4 in total) signals are sent to the AAC (KLA) control
unit (N22/1) over the AC bus.