Mercedes W164 W251 Rear SAM Fuse Box Control Unit Module A1645409262

Mercedes W164 W251 Rear SAM Fuse Box Control Unit Module is a specialized component from the Electronic control modules and controllers category, responsible for power distribution and controlling selected circuits in the rear of the vehicle. The module is designed for installation in the rear area, ensuring organized circuit routing and stable operation of electrical systems in Mercedes W164 and W251 series vehicles.

Specifications and technical data

• SKU: A1645409262
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645409262
• Substitutable numbers: A1645409262, A 164 540 92 62
• Location on the vehicle: Rear
• Category: ECUs & Computer Modules

Function and role of the rear SAM module

The rear SAM module in a Mercedes acts as a central hub for power management and electrical circuit protection in the rear of the body. It combines a fuse box with control electronics in one compact housing, which limits wiring harness length, reduces the number of connections, and improves the reliability of the entire system.

Thanks to its integrated design, the module allows for logical circuit separation, facilitates diagnostics and service, and enables faster localization of potential faults in the electrical installation. This solution is particularly important in modern Mercedes vehicles, where the number of electrical consumers and comfort functions in the rear of the vehicle is significant.

Purpose and placement in the vehicle

The described rear SAM module is intended for installation in the rear area of the vehicle, in accordance with the manufacturer's factory design. This placement shortens the wire runs between the module and the consumers, which reduces voltage drops and improves power stability.

This solution supports the proper operation of electrical systems responsible for comfort and safety functions in the rear body zone. Proper matching of the module to the specific vehicle version is crucial for maintaining full system functionality.

Benefits of using an original Mercedes module

Using an original module from the Electronic control modules and controllers category ensures compatibility with the vehicle's electrical architecture and predictable behavior of all supported circuits. Proper hardware and software matching minimizes the risk of communication errors within the vehicle's network.

Choosing a used, fully functional module allows for an economical repair without compromising factory build quality. This solution is particularly beneficial in cases of damage resulting from overloads, water ingress, or local short circuits in the installation, where replacing the complete module is technically justified.

Selection, compatibility, and installation aspects

When selecting a rear SAM module for a Mercedes W164 or W251 series, it is crucial to match it to the specific vehicle equipment configuration. In practice, this means verifying compatibility with the electrical installation, body style, and the comfort and safety systems installed.

Due to the nature of the component, installation by a workshop with experience in Mercedes electronics and access to appropriate diagnostic tools is recommended. This enables the correct execution of adaptation procedures, functional tests, and verification of the proper operation of all supported circuits after replacement.

Expert support and selecting used electronics

If you want to better understand how to safely choose used electronic modules and other controllers, how to check hardware and software compatibility, and what to pay attention to during installation, check out our guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?.

If you are planning a comprehensive repair or upgrade of the electrical installation area in your Mercedes and need other components from the same group, such as control modules, comfort controllers, or additional fuse boxes, check out the available parts in the Mercedes electronic control modules and controllers category.