Mercedes ML W166 GL X166 Body Comfort Control Unit SAM Module ECU A2139003208

Mercedes ML W166 GL X166 Body Comfort Control Unit SAM Module ECU is an advanced electronic controller from the Electronic control modules and ECUs category, responsible for coordinating numerous comfort and body functions in the rear of the vehicle. This solution is designed for users who expect stable electrical system performance, precise CAN network communication, and compatibility with Mercedes factory architecture.

Specifications and technical data

• SKU: A1669009411
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1669009411
• Substitutable numbers: A1669009411, A 166 900 94 11, A1669011202, A 166 901 12 02, A1669021302, A 166 902 13 02
• Location on the vehicle: Rear
• Category: ECUs & Computer Modules

Purpose and function of the module

The presented body comfort controller has been designed specifically for Mercedes ML W166 and GL X166 models, where it acts as a central hub managing selected electrical functions in the rear of the vehicle. As a SAM (Signal Acquisition and Actuation Module) type unit, it is responsible for collecting signals from sensors and controlling actuators, ensuring consistent operation of comfort and body systems.

Its location in the rear area of the vehicle helps shorten wiring harnesses and improves communication reliability with rear-end components, which is significant for both diagnostics and subsequent maintenance.

Key technical advantages

The Mercedes ML W166 GL X166 Body Comfort Control Unit SAM Module ECU stands out due to its design, which complies with Mercedes factory standards, resulting in:

• full integration with the vehicle's communication bus and existing electrical installation,
• preservation of the original logic of comfort and body systems,
• compatibility with professional service diagnostic tools,
• stable operation in conditions typical for the rear of the body (moisture, vibrations, temperature changes).

As an item in the Electronic control modules and ECUs category, this module is a vital component for maintaining the proper operation of electrical systems, especially in vehicles equipped with extensive comfort systems.

Condition, origin, and practical application

The offered controller is a used part, which in the case of Mercedes automotive electronics often represents a reasonable compromise between repair costs and maintaining high component quality. Modules of this type, sourced from dismantling, allow for economical repair of comfort systems without the need to resort to more expensive non-factory replacements.

In practice, the Mercedes ML W166 GL X166 Body Comfort Control Unit SAM Module ECU will prove effective both for typical replacement of a damaged controller and for more complex service work related to the vehicle's rear electrical system. Thanks to the preservation of the original architecture, it is possible to restore factory functionality without interfering with wiring or requiring additional modifications.

Selection by part numbers and compatibility

When selecting a body comfort controller for a Mercedes, it is crucial to pay attention to OEM markings and available interchangeable numbers to ensure hardware and software compatibility with a specific vehicle version. Proper module matching helps avoid communication issues within the vehicle network, diagnostic errors, and improper operation of comfort functions.

If you would like to learn more about choosing used controllers and sensors, how to verify compatibility, and practical installation aspects, check out our guide: Used automotive electronics – how to safely choose second-hand ECU modules and sensors.

System expansion and other Mercedes modules

If you are planning a comprehensive repair or upgrade of the comfort electronics area in your Mercedes and need other elements from the same group, such as body controllers, comfort modules, or other ECU units, check out the available parts in the Mercedes electronic control modules and ECUs category.

By using original modules from this group, you can maintain the consistency of the entire electronic system, facilitate diagnostics, and reduce the risk of problems resulting from incompatible solutions.