Description
Car Radio CONTINENTAL RD4N1M CD with MP3 for Citroën and Peugeot vehicles. The radio must be coded to the vehicle using diagnostics.
Overview
High-quality OEM Continental RD4N1M CD player with MP3 playback, designed for a range of Citroën and Peugeot models. This unit is the original equipment fitment for several Stellantis vehicles and is commonly sought under part numbers such as 9664769777 or 657992. Ideal for professional workshops and experienced DIY enthusiasts who need a factory-style head unit with CD and MP3 support. Note: The unit requires diagnostic coding to the vehicle to enable full functionality and to deactivate factory anti-theft protections.
Compatibility
Fits the following models (typical fitment):
- Citroën C2
- Citroën C3 I
- Citroën C4
- Citroën C8
- Peugeot 207
- Peugeot 307 II
- Peugeot 807
Technical Information
- Manufacturer: Continental (OEM for Stellantis)
- Model: RD4N1M CD
- Product Codes: 9664769777, 657992
- Additional Numbers: 657990, 657989, 657937, 657935, 657934, 6579PC
Installation Recommendations
Before starting any work, disconnect the battery to avoid short circuits and protect vehicle electronics. Remove surrounding trim panels carefully to avoid breaking clips, then unscrew and slide the radio from the dash. Disconnect antenna, power/speaker harnesses and any CAN/moster connectors. If steering wheel controls, microphone or external modules are present, transfer and reconnect them exactly as removed. After physical installation the radio must be coded to the vehicle with PSA diagnostic tools (for example DiagBox / Lexia / PP2000) to restore full functionality and unlock anti-theft features. For coding and programming steps use appropriate diagnostic equipment or have the procedure performed by a technician experienced with PSA systems.
Why This Part Fails Most Often
Common failure causes include wear of the CD/mechanism, electrical faults such as blown fuses or damaged power/ground connections, corrosion at multi-pin connectors (especially in cars exposed to high humidity), internal capacitor or solder joint degradation over many years, and software lockouts related to the factory anti-theft system if the unit has been replaced without proper coding. Temperature extremes and water ingress (from leaks) also accelerate failures.
Practical Notes For Workshops And DIYers
This OEM unit is frequently searched by part number — include the product codes when ordering or searching to ensure quick identification. If replacing a defective unit, keep the original unit and note any connector adaptors or brackets that need to be re-used. After installation verify radio functions (power, speaker outputs, AM/FM reception, CD/MP3 playback and steering wheel controls) and complete diagnostic coding to avoid warning lights or non-functional features.
Keywords
Continental RD4N1M, Citroën Radio 9664769777, Peugeot 657992, RD4N1M CD MP3, OEM Car Radio
