Description
Car radio CONTINENTAL RD4N1M CD with MP3 for Citroën and Peugeot vehicles. The radio must be programmed to the vehicle using diagnostics.
OEM Continental RD4N1M head unit offering CD and MP3 playback, designed as a direct replacement for many Citroën and Peugeot models. This unit preserves original mounting, connectors and dashboard integration for a clean factory-like fit. Frequently searched by part numbers, it is intended for professional workshops and experienced DIY mechanics who perform vehicle electronics work and radio coding.
Technical Information
Manufacturer: Continental (Original Equipment for Citroën/Peugeot)
Model: RD4N1M CD
Product Codes: 9664769777, 657992
Additional Numbers: 657990, 657989, 657937, 657935, 657934, 6579PC, 96647697XT
Compatible Models: Citroën/Peugeot 207; 307 II; 807; C2; C3 I; C4; C8
Fitment And Use
This unit is an OEM-style replacement for the listed Citroën and Peugeot models. It mounts into the original radio slot and uses factory wiring plugs, retaining steering wheel control compatibility when properly coded. Many customers locate this radio by its product codes, so check the part number against the unit being replaced before installation.
Installation Recommendations
Before starting, always disconnect the negative battery terminal to avoid risk of short circuits or damage to vehicle electronics. Typical replacement steps:
- Carefully remove trim panels around the radio using appropriate plastic pry tools to avoid damaging the dash.
- Unscrew and slide the radio out of the cage, then disconnect antenna, power and speaker connectors.
- Transfer any brackets or harness adapters if required and connect the new unit in reverse order.
- Reconnect the battery only after the unit is secured and connectors are in place.
After mechanical installation, the radio must be programmed to the vehicle using diagnostic equipment to restore full functionality (coding and security pairing). If you do not have the required diagnostic tool, have the coding performed by a qualified workshop with PSA diagnostic capability.
Why Units Fail And Typical Lifespan
Head units like the RD4N1M can remain functional for many years, but failure rates increase with age and operating conditions. Common causes of malfunction include:
- Heat and prolonged sun exposure causing electronic component degradation.
- Moisture ingress or corrosion at connectors.
- Mechanical wear of the CD mechanism (sticking, skipping or failure to read discs).
- Power surges or interrupted supply during battery changes or jump starts causing software lockups.
- Aging capacitors or solder joints inside the unit.
Regular use, clean environment and careful battery handling extend service life.
Recommended Tools And Skills
Ideal for professional mechanics or experienced DIYers. Recommended tools include trim removal tools, Torx/screwdriver set and, for final commissioning, PSA-compatible diagnostic tool for coding. If steering wheel controls or other integrated functions are not working after installation, diagnostic coding is required.
Notes On Programming
This radio requires diagnostic programming to the vehicle to restore full functionality and security pairing. Make sure coding and initialization are performed by personnel with appropriate diagnostic equipment and experience.
Why Choose This Unit
If you want a factory-fit radio with CD and MP3 playback for your Citroën or Peugeot, the Continental RD4N1M offers direct compatibility with original dashboard integration and connector layout. Purchasing by part number listed above is common practice and helps ensure you receive the correct replacement unit.
