Mercedes-Benz W211 Rear Climate Control Unit - Used Original Parts

Diagnosis and Common Symptoms

From a diagnostic standpoint, the rear climate control unit (K-KLA) in the W211 is a common point of failure, often leading to a significant loss of comfort for rear passengers. Technicians using STAR/XENTRY diagnostic tools will frequently encounter stored fault codes related to CAN-B communication errors or specific component failures within the rear climate system.

Common symptoms include:

• Unresponsive or intermittently working buttons on the rear control panel.
• The digital display is blank, flickering, or has missing pixels.
• Incorrect air temperature or fan speed from the rear center console vents, regardless of the setting.
• A complete lack of airflow from the rear vents while the front system operates normally.
• Stored diagnostic trouble codes (DTCs) pointing to actuator motor faults (e.g., blend door, mode door) or communication failure with the front Automatic Air Conditioning (AAC) control module.

Introduction

Restore full four-zone climate functionality to your E-Class with a reliable, Genuine Mercedes-Benz replacement part. This is not a new or aftermarket component; it is a Genuine used unit, carefully removed from a donor vehicle. Each rear climate control module has been bench-tested by our technicians to ensure every button, display segment, and internal circuit performs to factory specifications.

Product Details

• Brand: Mercedes-Benz
• Model Compatibility: E-Class W211 (2003-2009) equipped with 4-Zone Thermotronic Climate Control (SA Code 581).
• Part Name: Rear A/C Operating and Control Module (K-KLA)
• Condition: Genuine Used (Tested Working)
• Notes: Part number matching is crucial for plug-and-play installation. This module operates on the interior CAN-B bus and must establish communication with the main AAC unit to function correctly.