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.

Original Blaupunkt RD4 N1 MP3 car radio – 03 for Citroën/Peugeot (used). Ideal replacement for a non-functional unit in PSA models with on-board CAN network. Thanks to the OEM design, you will maintain full integration with the vehicle – controls on the steering wheel, displays on the on-board display, parking sensors and a hands-free/USB box (if it is in the car). Often searched under part numbers 9666403077, 6579FG, 6579PC.

Main advantages
– Original PSA/Blaupunkt part – no compromises in compatibility and sound
– CD/MP3 and RDS support, control on the steering wheel and display on the OEM display
– Full integration with BSI; possibility to set functions (parking sensors, amplifier, AUX/USB) by diagnostics
– Exact replacement for cars with RD4 – just adapt correctly (add to car)

Compatibility
– Citroën: C4 (I), other selected models with RD4 (e.g. C2, C3, C5 II, Berlingo B9) – always check against the OEM code
– Peugeot: 307 II (facelift), further cars with RD4 (e.g. 207, 308 I, 407, Partner B9) – always check against the OEM code
– Vehicle network: CAN (RD4)
– Physical compatibility: rear 1× Quadlock connector + 1× antenna connector (Fakra)
Tip: The surest verification is to compare the OEM numbers 9666403077, 6579FG, 6579PC and the connectors/old unit match.

Technical information
– Manufacturer/type: Blaupunkt RD4 N1 MP3 – 03
– Features: CD player with MP3 support, FM/AM tuner with RDS
– Power: approx. 4×15–20 W RMS (OEM standard)
– Communication: CAN-BUS, pairing via VIN (no PIN code)
– Connectivity: 1× Quadlock (power supply, speakers, CAN), 1× Fakra antenna
– Integration: OEM on-board display, control on the steering wheel; optional external amplifier (JBL) – set by diagnostics
– Part numbers (for search): 9666403077, 6579FG, 6579PC, RD4 N1 MP3

Important for assembly and coding
– The unit must be “added” to the car with diagnostics (e.g. Diagbox/Lexia/PP2000). Without VIN pairing, the radio will emit a warning tone (beep).
– As part of telecoding, set: body type, presence of parking sensors, external amplifier (JBL), AUX/USB, hands-free, etc.
– Recommended professional assembly and inspection of the condition of the connectors/installation in the car.

Package contents and condition
– Supplied as a bare RD4 car radio unit (without display, frame, steering wheel control, antenna or wiring).
– Used original part – see photos/specific condition. Compare with your old unit and OEM numbers before purchasing.

Search keywords
RD4 N1 MP3 Car Radio, Blaupunkt, 9666403077, 6579FG, 6579PC, Citroën C4, Peugeot 307 II, PSA OEM Car Radio, CD MP3, Quadlock, Fakra, CAN, Telecoding, VIN Matching.

The radio is designed for various vehicle models, including Citroën Berlingo III, C2, C3, C4, C8, and Peugeot 207, 307, 407, 807, and Partner III. With its wide compatibility with many car models, you can be confident that this part will be a perfect fit for your vehicle.

Technical Information
Manufacturer: Blaupunkt
Models: Citroën Berlingo III, C2, C3, C4, C8; Peugeot 207, 307, 407, 807, Partner III
Product Codes: 9659138977, 657932, 6579PC
Other Numbers: PSA Citroën Peugeot 9659138977 657932 6579PC

For the installation of the radio, we recommend performing diagnostics to ensure the radio is correctly assigned to your vehicle, preventing frequent beeping during incorrect installation. This process ensures that the radio functions smoothly and provides optimal performance.

Enjoy your favorite music with this reliable and high-quality radio that will enhance your journeys and make your time behind the wheel more enjoyable. With our Blaupunkt RD4 radio, every drive deserves an exceptional soundtrack.

This car radio provides excellent sound quality and usability, making it a popular choice among car enthusiasts and mechanics. It is important to note that the radio needs to be paired with the vehicle through diagnostics for proper function.

Common issues leading to the need for replacement include wear and tear of internal components, resulting in compromised audio performance or complete failure. Regular usage and exposure to varying temperature conditions can also accelerate wear.

Technical Information

• Manufacturer: BLAUPUNKT
• Model: RD4
• Product Codes: 9660646877, 9659138977, 9647521077, 657932, 6579PC
• Additional Numbers: 657932, 6579PC, 9647521077, 9659138977

This radio model is compatible with Citroën Berlingo III, C2, C3, C4, C8, and Peugeot 207, 307, 407, 807, and Partner III. The radio must be programmed to the vehicle using diagnostics for proper operation, making installation straightforward for both professionals and DIY enthusiasts.

One of the common issues with car radios is their tendency to fail due to electronic component wear, overheating, or power surges. It’s advisable to replace your car radio if you notice any irregularities in sound quality or functionality.

The CD Car Radio not only enhances your vehicle’s audio experience but also offers a reliable connection to your entertainment needs while driving.

Technical Information

• Manufacturer: Blaupunkt
• Model: RD4
• Product Codes: 9647521077, 9659138977
• Additional Numbers: 657932, 6579PC