Description
Car radio with CD for Citroën C5 from 2005 to 2007. The radio must be coded to the vehicle using diagnostic equipment.
This RD4 N1 CD radio is a direct-fit replacement designed for Citroën C5 II (2005–2007) and is commonly fitted in a range of PSA vehicles, including many Peugeot 407 models. It is a practical choice for workshops and experienced DIY mechanics who need a reliable OEM-style head unit with CD playback and original mounting compatibility. Frequently searched by part numbers 9650574977, 6564V1 and 6564V2, this unit restores factory functionality and keeps the vehicle interior looking original.
Key Features
– Original equipment style RD4 N1 radio with CD player, compatible with factory dashboard openings and harnesses where RD4 systems are used.
– Retains original functionality for steering wheel controls and vehicle audio integration when correctly installed and coded.
– Ideal for replacing faulty CD mechanisms, defective audio units, or upgrading back to a working OEM head unit without aftermarket adapters.
Installation and Recommendations
Removal and installation are straightforward for a trained technician: remove surrounding trim, unscrew the radio bracket screws, carefully pull the unit out, disconnect the antenna and harness plugs, and swap the unit. Always disconnect the vehicle battery before starting disassembly to avoid short circuits or damage to vehicle electronics. Check fuses and wiring harness condition while the radio is accessible. After mechanical installation the unit must be coded/programmed to the vehicle with appropriate diagnostic equipment to restore full functionality (radio coding pairing is required).
For reliable coding and to preserve vehicle features (steering wheel controls, immobilizer-related behavior), we recommend installation or final commissioning by a workshop equipped with PSA diagnostic tools (DiagBox/Lexia) or equivalent service-level equipment.
Why This Part Fails Most Often
Common failure causes include wear of the CD mechanism, accumulated dust and debris inside the tray and laser assembly, electrical issues such as blown internal fuses or damaged power supply components, connector corrosion or loose wiring, and damage from moisture. Sudden power interruptions or incorrect battery disconnection can also corrupt radio settings and require re-coding.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: RD4 N1 – Radio CD for Citroën C5 II (2005–2007). Also commonly compatible with Peugeot 407 variants using RD4 systems.
- Product Codes: 9650574977, 6564V1, 6564V2
- Other Numbers: RD4 N1
Additional Tips for Mechanics and DIYers
– Use proper trim removal tools to avoid breaking dash clips.
– Inspect antenna connection and grounding; weak reception is often caused by poor antenna contact.
– Test audio functions and CD operation before reassembling the trim.
– If the radio loses settings or fails to power on after fitting, verify fuses and wiring, then perform the required diagnostic coding step.
