Description
CD car radio RD4 D2 N2, has 2 antenna inputs. The radio must be coded to the vehicle with diagnostics. It is from a Peugeot 407.
The RD4 D2 N2 CD radio is a direct-fit multimedia unit commonly found in PSA group vehicles. Designed for professional garages and experienced DIYers, this unit delivers original functionality including CD playback and dual antenna support. The radio is often sought by part number (9659142777, 7643141392) so listing OEM references helps you find an exact replacement quickly. If you need a reliable OEM radio that matches factory controls and dashboard integration, the RD4 is a practical choice for Peugeot 407 and compatible Citroën models.
Technical Information
Manufacturer: Stellantis (Citroën / Peugeot)
Model: Peugeot 407 (compatible with some Citroën models, e.g. C5 II)
Product Codes: 9659142777, 7643141392
Other Numbers: 6564W5, 6564W6, 16085109YW
Key Features
- RD4 D2 N2 CD player unit — factory-fit functionality
- Two antenna inputs for improved radio reception or compatibility with diversity systems
- Direct dash integration with factory controls and vehicle wiring
- Requires vehicle coding/programming after installation to restore full functionality
Installation Recommendations
- Always disconnect the vehicle battery before starting removal or installation to avoid short circuits and protect vehicle electronics.
- Use appropriate trim tools to remove surrounding panels without damaging dashboard plastics.
- Carefully unplug connectors and note antenna plugs: this unit has two antenna inputs that must be reconnected correctly.
- After mechanical installation, the radio must be coded/programmed to the vehicle using PSA diagnostic equipment (e.g. DiagBox/Lexia) to restore full integration with vehicle electronics and steering wheel controls.
- If you lack diagnostic equipment, have coding performed by a technician with PSA service tools; incorrect coding may cause limited functionality or loss of features.
How To Replace
- Disconnect the negative battery terminal and wait a few minutes.
- Remove trim panels around the radio using plastic pry tools to avoid scratching.
- Unscrew and slide out the radio unit, then disconnect the harnesses and antenna leads.
- Fit the replacement unit, reconnect antenna cables and harnesses, secure the radio, and refit trim.
- Reconnect the battery and perform vehicle coding/programming so the unit is recognized and fully functional.
Why This Part Fails Most Often
Factory radios like the RD4 may develop faults over time due to several causes: CD mechanism wear or mechanical failure, moisture ingress causing corrosion on connectors or antenna sockets, thermal stress on internal electronics, damaged or corroded antenna connectors leading to poor reception, and software/EEPROM issues that require reprogramming. In many replacement cases, the unit itself is functional mechanically but needs proper coding to the vehicle to re-enable features and communication with the vehicle network.
Notes For Professionals
This unit is commonly searched by its OEM numbers — include those codes in searches to quickly locate matching parts. Installation and final commissioning require knowledge of PSA vehicle electronics and access to suitable diagnostic tools for coding.
Compatibility And Fitment
Primarily fitted to Peugeot 407 vehicles. It is also compatible with certain Citroën models that use the RD4 radio platform, such as C5 II. Confirm dashboard opening and connector compatibility before installation.
Recommendation
Ideal for workshops and experienced DIYers who can perform physical replacement and arrange coding with PSA diagnostic equipment. Proper installation and coding restore factory integration, steering wheel controls, and full radio functionality.
