Here’s a description of the Front SAM (Signal Acquisition Module) Module for the Mercedes-Benz C-Class C204 with turbo engine (e.g., C250 or C200 CGI):

 

Mercedes-Benz C204 Turbo Front SAM Module Description

Component Name: Front SAM (Signal Acquisition Module)

Part Location: Engine bay, left front (usually near the fuse box / battery area)

Mercedes Part Code Prefix: A204 900 / A212 900 / A204 545…

 

Function & Purpose

:

The Front SAM module is an essential electronic control unit (ECU) that serves as a gateway and fuse/relay controller for front-end electronics. It processes and distributes input/output signals between vehicle systems.

 

Main Functions:

• Controls front lighting: headlamps, fog lamps, DRLs
• Controls radiator fan, coolant pump, turbo intercooler fans
• Communicates with the engine ECU and other control units via CAN bus
• Manages windshield wipers & washers
• Supplies power and signal control for front sensors (e.g., parking sensors, air temperature)
• Monitors and diagnoses front-end electrical circuits
• Supports functions like turbocharger cooling, A/C fan regulation

 

Common Issues When Faulty

:

• Headlamps or fan not working
• No communication with diagnostic tools
• Intermittent power to turbo cooling fan or radiator fan
• Fuse-related power failures

 

System Links

:

• Connected to rear SAM, engine ECU (ME), instrument cluster, A/C module, and battery
• Part of the overall CAN-B and CAN-C network

If you’re replacing or diagnosing this module, coding or programming may be required with Mercedes Star Diagnosis (Xentry). It’s important to match part numbers exactly when sourcing a used replacement.

Let me know if you want part number references, wiring diagrams, or how to identify it physically.