Mercedes-Benz Rear SAM Module Relay Fuse Box 2049060205 / 2049019702 – Complete Guide
Introduction
The Rear SAM (Signal Acquisition Module) Relay Fuse Box is one of the most important electrical control units in Mercedes-Benz vehicles. It ensures that power is properly distributed to critical systems, including rear lighting, trunk electronics, comfort features, and safety functions.
If you own a Mercedes-Benz C-Class (W204) or GLK-Class (X204), chances are your vehicle uses the Rear SAM module part number 2049060205 / 2049019702, manufactured by Hella (5DK011022-11). In this blog, we’ll explain its purpose, early signs of failure, compatibility, replacement process, and whether programming is required.
What Does the Rear SAM Module Do?
The Rear SAM module acts as a power distribution center and communication hub. It connects to your car’s CAN-Bus network and manages functions such as:
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Rear lights and brake lights
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Rear fog light and turn indicators
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Trunk and tailgate electronics
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Rear wiper (if equipped)
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Parking sensors and comfort features
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Power supply monitoring and distribution
Without a properly functioning Rear SAM module, these features may fail or behave inconsistently.
Early Signs of Rear SAM Module Failure
Like any electronic module, the SAM fuse box can fail due to age, water damage, overheating, or electrical overload. Common warning signs include:
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Rear lights not working – brake, reverse, or tail lights may stop functioning.
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Trunk electronics malfunction – central locking or power tailgate issues.
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Battery drain – faulty relays may keep systems powered when the car is off.
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Intermittent electrical errors – random warning lights or fault codes.
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No communication with diagnostic tools – SAM module may stop responding on the CAN-Bus.
If you notice these symptoms, replacing the faulty SAM unit is the best solution.
Compatibility Table
| Make | Model | Chassis Code | Year Range | Notes |
|---|---|---|---|---|
| Mercedes-Benz | C-Class | W204 | 2007 – 2014 | Rear SAM Fuse Relay Box |
| Mercedes-Benz | GLK-Class | X204 | 2008 – 2015 | Rear SAM Fuse Relay Box |
| Mercedes-Benz | Other Models | Various | 2007 – 2015 | Confirm via VIN for exact fitment |
OEM Part Numbers: 2049060205 / 2049019702
Hella Reference: 5DK011022-11
Do You Need Programming After Replacement?
In most cases, replacing the Rear SAM module requires initialization and coding using Mercedes-Benz STAR Diagnostic software.
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If replacing with a brand new module, programming is required to match your vehicle’s configuration.
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If replacing with a used module, it may also need re-coding or adaptation. Some features may not work correctly until it is programmed.
Therefore, it’s recommended to have a professional workshop or Mercedes-Benz specialist perform the installation and coding.
How to Replace the Rear SAM Fuse Box
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Disconnect the battery before working with electrical modules.
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Locate the Rear SAM module (usually in the trunk/rear fuse compartment).
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Remove the protective cover and disconnect all wiring harnesses.
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Unbolt the old unit and replace it with the new one.
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Reconnect the wiring, secure the cover, and reconnect the battery.
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Perform programming/coding if required.
Why Buy Genuine Rear SAM Modules?
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Perfect OEM fitment
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Long-term durability
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Reliable performance without electrical errors
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Backed by Mercedes-Benz and Hella quality
Conclusion
The Mercedes-Benz Rear SAM Module Relay Fuse Box 2049060205 / 2049019702 (Hella 5DK011022-11) is a vital component for the proper operation of your vehicle’s electrical systems. If you experience rear light issues, trunk malfunctions, or random electrical errors, your SAM unit may need replacement.
At Automan Spare Parts, we supply genuine OEM SAM modules at competitive prices, shipped worldwide. Always confirm compatibility with your VIN before ordering to ensure the perfect fit.
