Mercedes E-Class W211 S211 Bi-Xenon Headlight Level Control Unit Module LWR

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Genuine Mercedes-Benz E-Class W211 S211 Bi-Xenon Headlight Level Control Unit Module LWR A2118203226

Genuine used Mercedes-Benz Bi-Xenon automatic headlight levelling control unit, designed for selected E-Class W211 Saloon and S211 Estate models equipped with factory Bi-Xenon headlights.

This electronic module forms part of the automatic headlamp range adjustment system (LWR – Leuchtweitenregelung) and helps maintain the correct headlight beam height as vehicle loading and suspension position change.

Part Number: A2118203226

OE Number: A 211 820 32 26

Alternative Number Format: 2118203226

Part Type: Headlight Level Control Unit / LWR Module

System: Bi-Xenon Automatic Headlamp Levelling

Application: Factory Bi-Xenon Headlights

Vehicle Platform: W211 / S211

Manufacturer: Mercedes-Benz

Condition: Genuine Used OEM Part

COMPATIBILITY

Suitable for selected Mercedes-Benz E-Class W211 / S211 models equipped with the corresponding factory Bi-Xenon / automatic headlamp levelling system.

Mercedes-Benz E-Class W211 Saloon – 2002–2009

• E200 / E200 Kompressor

• E220 CDI

• E230

• E240

• E270 CDI

• E280

• E280 CDI

• E300

• E300 BlueTEC

• E320

• E320 CDI

• E350

• E400 CDI

• E420 CDI

• E500

• E55 AMG

• E63 AMG

Mercedes-Benz E-Class S211 Estate / T-Model – 2003–2009

• E200 / E200 Kompressor

• E220 CDI

• E230

• E240

• E270 CDI

• E280

• E280 CDI

• E320

• E320 CDI

• E350

• E400 CDI

• E420 CDI

• E500

• E55 AMG

• E63 AMG

Petrol and diesel applications are possible because the module is part of the lighting system rather than the engine-management system.

However, engine/model alone does NOT confirm compatibility. Mercedes used different lighting configurations throughout W211/S211 production, particularly between pre-facelift and facelift vehicles and between standard Xenon/Bi-Xenon and active/adaptive lighting systems.

Only vehicles equipped with the corresponding factory Xenon/Bi-Xenon headlamp system should be considered.

TECHNICAL INFORMATION

The LWR control unit forms part of the vehicle’s automatic headlamp range adjustment system.

Automatic levelling is particularly important with Xenon/Bi-Xenon headlights because changes in vehicle loading can alter the angle of the headlight beam.

The system uses information from the vehicle’s level/suspension sensors to determine vehicle attitude.

The control system can then command the headlamp levelling motors to compensate for changes caused by:

• Passenger loading

• Luggage loading

• Rear axle loading

• Suspension movement

• Vehicle pitch

• Changes in vehicle ride height

This helps maintain the intended headlight beam position and reduces the possibility of dazzling approaching traffic.

BI-XENON / LWR SYSTEM INFORMATION

The complete automatic levelling system can include:

• LWR headlamp level control module

• Front axle level sensor

• Rear axle level sensor

• Sensor linkage arms

• Headlamp levelling motors

• Left Bi-Xenon headlamp

• Right Bi-Xenon headlamp

• Xenon control/ballast modules

• Vehicle wiring and connectors

• CAN communication with other control modules

Mercedes technical information identifies dedicated headlamp range adjustment control, HRA/LWR power module and axle-level sensor components within the W211 lighting system.

COMMON SYMPTOMS OF A FAULTY LWR MODULE

• Headlights pointing too high

• Headlights pointing too low

• Automatic headlight levelling not operating

• Headlights fail to perform normal adjustment

• One or both headlights remain in incorrect position

• Headlamp range control warning

• Xenon/Bi-Xenon warning message

• Headlight levelling fault stored in diagnostics

• Communication fault with headlamp levelling system

• Intermittent headlight adjustment

• Module damaged by moisture or electrical fault

IMPORTANT DIAGNOSTIC INFORMATION

A headlamp levelling fault does not automatically mean that this control module is defective.

Before replacement, the system should ideally be diagnosed using Mercedes STAR/Xentry or another suitable diagnostic system.

Check:

• Front axle level sensor

• Rear axle level sensor

• Level sensor linkage arms

• Wiring harness

• Electrical connectors

• Module power supply

• Ground connections

• Headlight levelling motors

• Xenon control units

• Headlamp wiring

• CAN communication

• Water/moisture damage

• Relevant stored diagnostic trouble codes

A broken or seized suspension level-sensor linkage can produce symptoms similar to a defective control module.

VEHICLE NETWORK / DIAGNOSTICS

The automatic headlamp levelling system communicates with other vehicle electronics to determine the required headlight position.

Diagnostic equipment can normally be used to:

• Read stored fault codes

• Check sensor values

• Monitor system operation

• Test headlamp adjustment

• Identify communication faults

• Perform system calibration where required

This can help distinguish a defective module from a failed sensor, wiring problem or headlamp actuator fault.

INSTALLATION

Installation should be carried out with the vehicle electrical system safely isolated where required.

Before fitting, compare the replacement module with the original for:

• Mercedes OE number

• Electrical connector

• Connector pin configuration

• Module casing

• Mounting points

• Lighting-system specification

After installation, the complete automatic levelling system should be tested.

PROGRAMMING / CODING

Depending on the vehicle specification and replacement procedure, diagnostic configuration, initialisation or headlamp levelling calibration may be required after installation.

For best results, the system should be checked using Mercedes STAR/Xentry or equivalent diagnostic equipment.

Correct mechanical headlamp alignment should also be verified after repairs.

IMPORTANT COMPATIBILITY NOTE

Mercedes W211/S211 vehicles were available with several different headlight systems, including:

• Halogen headlights

• Xenon / Bi-Xenon headlights

• Automatic headlamp levelling

• Bi-Xenon with integrated curve illumination

• Different pre-facelift and facelift electronic configurations

Therefore, W211/S211 model compatibility alone is not sufficient.

Before ordering, please compare:

Part Number: A2118203226 / A 211 820 32 26

Also check:

• Headlight type

• Vehicle equipment/options

• Production date

• Electrical connector

• Module appearance

• Existing module number

Matching the OE number from your original module is the safest method of confirming compatibility.

CONDITION

Genuine used Mercedes-Benz OEM part.

The module may show normal cosmetic signs of previous installation, use, storage and removal.

Please inspect the listing photographs carefully to confirm the exact part number, connector and condition of the item supplied.

Ideal genuine Mercedes-Benz replacement for a faulty Bi-Xenon automatic headlight levelling / LWR control module on compatible E-Class W211 and S211 vehicles where OE number A2118203226 matches the original unit.