Description
Car radio with CD RD4 D2 N2, has 2 antenna inputs. The radio needs to be coded to the vehicle using diagnostics. It is from PEUGEOT 407.
High-quality replacement RD4 CD radio designed for Citroën and Peugeot vehicles, commonly fitted in Peugeot 407 and compatible PSA models. This unit offers original-spec connectivity, two antenna inputs for improved reception and the standard RD4 feature set used across many Stellantis vehicles. Ideal for professional workshops and DIY mechanics who search by part number — the most common references are listed below for quick lookup and fitment verification.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: RD4 D2 N2 (Radio with CD)
- Product Codes: 9659142777, 7643141392
- Other Numbers: 6564W5, 6564W6, 16085109YW
- Origin Vehicle: Peugeot 407
- Features: CD playback, two antenna inputs (diversity), standard RD4 connector layout
Fitment And Compatibility
Primarily fitted to Peugeot 407 models and compatible with a range of PSA vehicles that use the RD4 radio platform. Always check the listed product codes when searching; many customers find this unit by entering the part number directly into search fields.
Replacement Procedure (Overview)
Suitable for experienced technicians and competent DIYers. Typical removal and installation steps:
- Disconnect negative battery terminal before starting work.
- Carefully remove surrounding trim panels using plastic pry tools to avoid damage.
- Unscrew and extract the radio; slide unit forward to access rear connectors.
- Disconnect antenna leads (note: unit has two antenna inputs) and all wiring harness connectors, including power, speaker, and any data/illumination plugs.
- Install reverse procedure: connect harness, test power and speakers, then secure radio and refit trim.
- After physical installation the radio must be coded/paired to the vehicle with diagnostic equipment to restore full functionality.
Installation Recommendations
- Use correct trim tools to prevent damage to panels and clips.
- Verify connector pins and antenna plugs for corrosion or bent pins before re-assembly.
- Recommended to perform coding with PSA diagnostic tools (DiagBox / PP2000 / Lexia) to ensure radio is recognized by the vehicle and to restore features such as steering-wheel controls and display settings.
- Check speaker outputs and can-bus messages after coding to confirm full integration.
- If you are not experienced with vehicle coding, have a trained technician perform the diagnostic programming.
Why This Part Fails Most Often
- Worn CD Mechanism: Mechanical wear or laser pickup degradation is a common cause of CD playback failure.
- Electrical Issues: Faulty power supply, intermittent contacts on wiring plugs or blown internal fuses can cause loss of function.
- Connector Corrosion: Moisture ingress or corrosion on antenna and harness connectors degrades reception and electrical continuity.
- Software/Configuration: After replacement, units that are not coded will not operate correctly — the radio must be programmed to the vehicle.
- Physical Damage: Impact or water ingress can damage internal electronics and lead to permanent failure.
Practical Tips For Diagnosis
- Check fuses and supply voltages at the radio connector before condemning the unit.
- Inspect antenna feeds and ground connections if reception is poor despite functioning radio unit.
- Replace or clean connectors showing oxidation; poor contacts are a frequent source of faults.
- If CD does not read disks, test basic power and motor operation before attempting mechanical repair.
Why Choose This Unit
This RD4 radio maintains original factory functionality, supports PSA-specific integration and carries common OEM part numbers used by mechanics and parts search engines. It’s a practical replacement when restoring audio and integration in affected Peugeot and Citroën vehicles.
Additional Notes
Because the unit requires diagnostic coding after installation, plan for diagnostic time when scheduling repairs. Proper coding ensures steering wheel controls, vehicle messages and audio settings operate as designed.
