MERCEDES CLS E C C218 FRONT SEAT CONTROL MODULE DRIVER RIGHT 2013-2017 W207 W204

#73

Genuine Mercedes-Benz Front Electric Seat Control Module ECU A1729006903

Genuine used Mercedes-Benz electric front seat control module / memory seat ECU, removed from a Mercedes CLS C218 front electric seat.

This electronic control unit manages powered seat adjustment functions and, depending on vehicle equipment, works with the seat motors, adjustment switches, memory functions and vehicle electrical network.

Part Number: A1729006903

Mercedes-Benz OE Number: A 172 900 69 03

Alternative Number: 1729006903

Part Type: Front Seat Control Module / Seat ECU / Memory Seat Module

Mercedes Designation: Control Unit, Complete

Mercedes System Reference: Seat Control Unit / N32/1 application

System: Electric / Memory Front Seat Adjustment

Position: Front Seat – exact side/configuration must be checked

Donor Application: Mercedes-Benz CLS C218

Manufacturer: Mercedes-Benz

Condition: Genuine Used OEM Part

OE / SUPERSEDED / INTERCHANGE NUMBERS

Mercedes parts information lists A1729006903 as replacing or superseding several earlier seat control-module numbers.

Known related/interchange numbers include:

A1728200126

A1729007500

A2129005200

A172900690380 – remanufactured/exchange reference

Depending on seat side and vehicle specification, closely related modules also include:

A1729007003

A1729007600

A2129005300

IMPORTANT: Do not assume that every number above is freely interchangeable between left and right seats. Match the original module number and vehicle equipment.

COMPATIBILITY

A1729006903 has substantially wider Mercedes-Benz compatibility than CLS alone.

Mercedes catalogue and fitment data confirms applications across CLS C218, E-Class W212, C-Class W204 and additional Mercedes platforms. (MB Parts Giant)

MERCEDES-BENZ CLS C218 / W218 – 2011–2018

Confirmed/potential applications with the corresponding electric seat specification include:

• CLS 220 BlueTEC / CLS 220 d – configuration dependent

• CLS 250 CDI – configuration dependent

• CLS 250 BlueTEC / CLS 250 d – configuration dependent

• CLS 250 d 4MATIC – configuration dependent

• CLS 300 – configuration dependent

• CLS 350

• CLS 350 CDI

• CLS 350 BlueTEC / CLS 350 d

• CLS 350 4MATIC

• CLS 400

• CLS 400 4MATIC

• CLS 500 / CLS 550

• CLS 500 / CLS 550 4MATIC

• CLS 63 AMG

• CLS 63 AMG 4MATIC

• CLS 63 AMG S / S-Model

Mercedes EPC specifically shows A1729006903 in the seat-adjustment parts catalogue for a 2014 CLS 350 BlueTEC C218, providing strong direct evidence for C218 fitment. (G-Force Parts)

MERCEDES-BENZ CLS SHOOTING BRAKE X218 – 2012–2018

Selected electrically adjustable / memory-seat specifications may also use this control-module family, including:

• CLS 220 d Shooting Brake

• CLS 250 CDI / BlueTEC / d Shooting Brake

• CLS 250 d 4MATIC Shooting Brake

• CLS 350 CDI / BlueTEC / d Shooting Brake

• CLS 350 d 4MATIC Shooting Brake

• CLS 400 Shooting Brake

• CLS 400 4MATIC Shooting Brake

• CLS 500 Shooting Brake

• CLS 500 4MATIC Shooting Brake

• CLS 63 AMG Shooting Brake

• CLS 63 AMG S Shooting Brake

MERCEDES-BENZ E-CLASS W212 / S212 – APPROX. 2009–2016

A1729006903 is also used within the W212/S212 electric seat system.

Potential applications include selected:

• E200

• E200 CDI / BlueTEC

• E220 CDI / BlueTEC

• E250 CDI / BlueTEC

• E300

• E300 CDI / BlueTEC

• E300 BlueTEC Hybrid

• E350

• E350 CDI / BlueTEC

• E400

• E500 / E550

• E63 AMG

• E63 AMG S

Fitment data specifically confirms 2014–2016 E250 BlueTEC, 2010–2016 E350, and additional W212 derivatives. (MB Parts Giant)

MERCEDES-BENZ E-CLASS COUPE / CABRIOLET C207 / A207

Selected W207 / C207 / A207 electric-seat applications also use this module family.

Potential applications include:

• E200

• E250

• E300

• E350

• E400

• E500 / E550

• Petrol and diesel versions depending on market and seat specification

MERCEDES-BENZ C-CLASS W204 / S204 / C204

Confirmed fitment data includes:

• C250 – 2012–2015

• C300 – 2012–2014

• C350 – 2012–2015

• C63 AMG – 2012–2015, including selected Black Series applications

Additional W204 derivatives may use the same module depending on seat specification. (MB Parts Giant)

MERCEDES-BENZ GLK X204

Selected:

• GLK250

• GLK350

• Electric/memory-seat equipped versions

MERCEDES-BENZ SLK R172

Selected:

• SLK250

• SLK300

• SLK350

• SLK55 AMG

ADDITIONAL APPLICATIONS

Parts data also associates 1729006903 with selected later:

• Mercedes-AMG GT

• Mercedes-AMG GT C

• Mercedes-AMG GT R

• Mercedes SLC300

• Mercedes-AMG SLC43

These applications are highly specification dependent and should only be used when the original module number matches. (Wolf Auto Parts)

FRONT LEFT / RIGHT SEAT INFORMATION

There is an important compatibility point with this module.

Mercedes-Benz’s own parts information identifies:

A1729006903 – LEFT SEAT / N32/1

Mercedes documentation also lists related modules for the opposite seat.

However, used-parts catalogues sometimes describe A1729006903 as suitable for front left or right seat applications. (Mercedes-Benz USA LLC)

Therefore, the safest compatibility method is:

MATCH A1729006903 DIRECTLY TO THE MODULE REMOVED FROM YOUR VEHICLE.

For a UK RHD vehicle:

Front Right = Driver / O/S

Front Left = Passenger / N/S

For an LHD vehicle:

Front Left = Driver

Front Right = Passenger

Because Mercedes module designations can relate to the physical seat side rather than “driver/passenger” terminology, OE-number matching is much safer than relying on driver/passenger descriptions.

TECHNICAL INFORMATION

The seat control module acts as the electronic controller for the powered front-seat adjustment system.

Depending on vehicle equipment, it can control or coordinate functions including:

• Electric fore/aft seat adjustment

• Seat height adjustment

• Seat cushion inclination

• Backrest adjustment

• Headrest adjustment

• Memory seat functions

• Seat position storage/recall

• Communication with seat adjustment switches

• Control of individual electric seat motors

• Communication with other vehicle control modules

The module receives commands from the seat adjustment controls and commands the corresponding electric seat motors.

MEMORY SEAT SYSTEM INFORMATION

On vehicles equipped with memory seats, the module forms part of the system responsible for storing and recalling seat positions.

Depending on vehicle equipment, the complete system can involve:

• Seat control module

• Door-mounted seat adjustment switches

• Memory buttons

• Electric adjustment motors

• Seat wiring harness

• Vehicle CAN network

• Door control modules

• Steering column adjustment system

• Exterior mirror memory functions

The exact functionality depends on vehicle specification and factory option codes.

COMMON SYMPTOMS OF A FAULTY SEAT MODULE

• Electric seat completely inoperative

• Multiple seat adjustments stop working

• Seat operates intermittently

• One or more motors do not respond

• Memory seat function not operating

• Stored seat positions not recalled

• Seat adjustment switches appear unresponsive

• Communication fault with seat control module

• Seat-related diagnostic fault codes

• Module damaged by moisture

• Internal electronic failure

• Replacement required following seat conversion or repair

IMPORTANT DIAGNOSTIC INFORMATION

A non-working electric seat does not automatically mean the control module is faulty.

Before replacement, check:

• Seat fuses

• Battery voltage

• Seat power supply

• Ground connections

• Seat wiring harness

• Electrical connectors

• Door/seat adjustment switches

• Individual seat motors

• CAN communication

• Seat mechanism for mechanical seizure

• Stored diagnostic fault codes

Mercedes STAR/Xentry or equivalent diagnostic equipment is recommended for accurate diagnosis.

VEHICLE NETWORK / DIAGNOSTICS

This is an electronic control module that communicates with other vehicle systems.

Diagnostic equipment can be used to:

• Read stored fault codes

• Check module communication

• Check seat adjustment commands

• Test individual seat functions

• Check electrical supply

• Check memory functions

• Verify CAN communication

• Identify coding/configuration problems

PROGRAMMING / CODING

Programming/coding may be required after replacement.

Mercedes parts information specifically states that A1729006903 must be checked for current flashware after installation. (MB Part Source)

A used replacement module may therefore require:

• Vehicle-specific coding

• Variant coding

• Software/flashware check

• Initialisation

• Adaptation to the vehicle’s equipment

Mercedes STAR/Xentry or suitable specialist diagnostic equipment is recommended.

Do not assume that installing a used module with the same connector will automatically provide full functionality.

INSTALLATION

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

• A1729006903 OE number

• Electrical connectors

• Connector pin arrangement

• Module casing

• Mounting points

• Seat side

• Vehicle equipment/options

Disconnecting vehicle electrical components should be carried out according to the correct Mercedes workshop procedure.

After installation, test all available electric seat functions and perform diagnostic coding/checks where necessary.

IMPORTANT COMPATIBILITY NOTE

Mercedes used multiple seat modules according to:

• Vehicle platform

• Production date

• Left/right seat

• Memory seat specification

• Electric seat equipment

• Factory option codes

• Software version

• Vehicle market

Known related numbers include:

A1729006903

A1728200126

A1729007500

A2129005200

Closely related opposite-side/configuration numbers can include:

A1729007003

A1729007600

A2129005300

Do not replace one number with another solely because the connectors appear identical.

The safest compatibility check is to match:

A1729006903 / A 172 900 69 03

and then verify:

• Vehicle chassis

• Seat side

• Seat equipment

• Connector configuration

• Mercedes option codes

• Software/coding requirements

CONDITION

Genuine used Mercedes-Benz OEM electronic control module.

Removed from a Mercedes-Benz electric front seat.

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

Please inspect the listing photographs carefully to confirm the OE number, electrical connectors, casing and mounting points against your original module.

Ideal genuine Mercedes-Benz replacement seat adjustment / memory control module for compatible CLS C218/X218, E-Class W212/S212/C207/A207, C-Class W204 and other Mercedes applications where A1729006903 and the vehicle’s seat specification match the original unit.