Mercedes-Benz S-Class W222 Retrofit

Mariam tarzhyt
Jun 24
3 min read

🛠️ Mercedes-Benz S-Class W222 Retrofit Guide: 2015–2017 to 2018–2020 (Kit)

Upgrading your 2015–2017 Mercedes-Benz S-Class W222 to the 2020 facelift interior offers both visual modernization and improved functionality. As an engineer with two decades at Mercedes-Benz R&D, I’ve personally overseen many such transformations — and our OEM Retrofit Kit Option 3 provides the most technically sound and factory-accurate solution for this upgrade.

This retrofit is particularly focused on upgrading:

The Digital Instrument Cluster
The Head Unit HU5.5
The Mouse Controller (Touchpad Interface)
Steering wheel w222 2020
— all integrated with factory wiring standards and ECU protocols.

🔧 OEM Kit Components Overview

Digital Instrument Cluster (Widescreen, 12.3")
- Replaces analog or hybrid cluster with fully digital display.
- Resolution: 1920x720, LVDS interface.
- Real-time data visualization: speed, navigation, ADAS, trip, media.
- Requires coding adaptation to SCU (Steering Control Unit) and EZS (Ignition Switch Unit).
Head Unit HU5.5 (NTG 5.5)
- Updated infotainment system with faster processor and new UI.
- Integrated support for Apple CarPlay, Android Auto, HD Navigation.
- Interfaces with digital cluster via LVDS and CAN bus.
- Requires activation through XENTRY or remote SCN coding.
Mouse Controller (Touchpad with Rotary Knob)
- Updated 2018+ model with capacitive input and gesture support.
- Controls both HU5.5 and instrument cluster via central COM module.
- Physically compatible with W222 center console; plug-and-play with minor harness adaptation.
W222 Steering Wheel 2020 + Retrofit Adaptor
- Enables new-generation steering wheels to function with older SCU.
- Retains paddle shift, audio, and cruise control buttons.
- Required for compatibility with digital cluster scrolling and drive mode switching.
USB Interface Module
- High-speed data transfer and fast-charging capability.
- Supports CarPlay/Android Auto.
- Mounts directly in place of older USB/AUX unit.
IC Adaptor (Instrument Cluster Interface Adapter)
- Converts signal structure from old CAN formatting to LVDS-compatible protocol.
- Essential for enabling digital cluster without replacing entire CAN backbone.
Drive Assistant Button Panel (Facelift Version)
- New button layout for DISTRONIC, Parking Pilot, and Lane Keep Assist.
- Matches the interface language of the 2018+ facelift UI.

🧠 Technical Installation Steps

Step 1: Preparation

Disconnect battery (safety first).
Remove dashboard trim, center console, and OEM cluster.
Backup coding from original cluster using Vediamo or DTS Monaco.

Step 2: Hardware Replacement

Install the Digital Cluster into the dash panel. Secure all LVDS and CAN connectors.
Replace original head unit with HU5.5, ensuring antenna, LVDS, GPS, USB, and MOST are connected.
Install the new mouse controller, aligning the plug and fascia with the center console.
Connect the IC Adaptor between the cluster and CAN line.
Replace old USB module and install the new USB interface with updated wiring.

Step 3: Steering Wheel Compatibility

If upgrading the steering wheel later, install the retrofit adaptor at this stage.
Confirm compatibility with SCU and ESP modules.

Step 4: Button Panel

Replace the original assistant control panel with the facelift version.
Connect CAN lines and confirm communication with driver assistance modules.

Step 5: Coding & Adaptation

Launch XENTRY, or DTS Monaco.
Code the new instrument cluster (IC213) to the vehicle’s VIN.
Adapt HU5.5 using SCN online coding or prepared offline files.
Test all functions: Drive modes, navigation on cluster, media display, assist features.
Calibrate steering wheel controls (if updated).