Overview
Review draft — HOLD: The written source gives 2021–2024, while the product photograph gives 2021–2025. The 2025 fitment and equipment/controller variants remain unconfirmed. Image wording, video subtitles and full audio/video acceptance still require correction and review.
The Chinese written guide describes this rear-door kit for Mercedes-Benz S-Class 223, model years 2021–2024. It adds a rotating tweeter and illuminated surround to the rear-door speaker grille. The source describes replacement installation using adapter wiring, without modifying the factory wiring or requiring programming. Confirm these requirements for the vehicle's original equipment and the supplied kit.
Confirm the exact model year, rear-door trim and audio equipment, controller revision, and matching adapter harness before installation. The illustrated procedure includes cutting the door-trim backing and changing the grille fixing points; the source's statement about factory wiring does not mean the trim remains unmodified.
Kit components
The source numbers the components as follows:
- Rear-door rotating tweeter assemblies.
- Rotation-drive modules (4D).
- Adapter harnesses.
- Fixing screws.
On the photographed module label, 生产日期 means manufacture date.
Rear-door trim removal
The following descriptions translate the Chinese captions in the source photographs. Match the illustrated trim and connector layout to the vehicle before using the procedure.
- The source shows three screws securing the rear-door trim. Remove the screw shown with a T20 tool.
- Slide the armrest horizontally outward, in the direction shown by the arrow.
- Remove the securing screws exposed beneath the armrest using a T30 tool.
- Pull the lower edge of the door trim outward to release the retaining clips.
- Pull the upper edge outward to release the retaining clips.
- Release the door-handle cable from its retaining mechanism.
- Disconnect the factory door-control connectors identified as 12# and 13# in the source figure. These labels refer to the illustrated connectors; they are not instructions to remove individual pins.
- Disconnect the tweeter speaker connector.
Rear-door tweeter installation
- Remove the original grille's welded plastic fixing points shown in the source figure, then remove the original grille.
- Position the supplied locating template and trace the cutout. The source photographs and template clip show the area to be removed.
- Cut out the marked section of the trim backing to the shape shown. Confirm that the template and marked area match the supplied kit before cutting.
- Check the fit. The source says to trim the two sides further if the replacement assembly still interferes with the opening.
- Clip the replacement grille into position. The source lists the supplied screws or welded fixing points as securing methods. Use the fixing method specified for the supplied kit; the source does not provide screw torque or welding tool settings.
The fixing clip shows the attachment points on the back of the grille and names an electric soldering iron or ultrasonic welding for the plastic fixing points. This describes grille attachment, not soldering the vehicle's electrical wiring.
The wiring clip shows separate lighting and rotation-drive connections, plus an adapter for the factory tweeter speaker connection. It identifies the factory connector as number 12 and shows a branch marked 5P. Confirm the actual module ports, connector pairs and harness version against the supplied wiring information; a connector's pin count alone does not establish compatibility. The clip also describes wrapping unused connectors and securing the two modules after connecting the harness.
Lighting controls shown in the source
The source screen examples show an ambient-lighting menu. They illustrate single-color and multicolor selection, brightness and effects. The captions below describe the pictured controls; the exact menu wording and available functions depend on the vehicle's head unit and equipment.
| Chinese screen label | English meaning |
|---|---|
| 座椅 | Seats |
| 氛围灯 | Ambient lighting |
| 畅心醒神 | Comfort and refreshment tab |
| 颜色 | Color |
| 单色彩 | Single color |
| 多色彩 | Multicolor |
| 亮度 | Brightness |
| 效果 | Effects |
| 下车警告 | Exit warning |
| 气候 | Climate |
| 欢迎 | Welcome |
| 动态多色彩 | Dynamic multicolor |
| 整合区域 | Combine zones |
| 气候菜单 | Climate menu |
These screen examples do not specify the rear tweeter's rotation trigger, travel limits or synchronization procedure. Confirm those details for the supplied controller.
Troubleshooting
- The rotating tweeter does not illuminate: check that the adapter connections are correct and that the mating connector pins are not misaligned or bent.
- The tweeter does not rotate outward: check the adapter connections and mating pins, and check whether the motor or mechanism is jammed.
- Factory vehicle functions behave abnormally: check whether any factory connector has been left disconnected, an adapter has been connected to the wrong circuit, or wiring was damaged during installation and caused a short circuit.
These checks translate the source troubleshooting text. The source does not provide an electrical test procedure or a complete reassembly and function-test checklist.