Description
Blaupunkt RD4 CD car radio for Citroën and Peugeot vehicles. The radio must be programmed to the vehicle using diagnostic tools.
This Blaupunkt RD4 unit is an OEM-style CD radio commonly fitted to a range of Citroën and Peugeot models. It appears under several part numbers used by Stellantis and aftermarket suppliers, making it easy to find by product code (for example 9660646877). Ideal for professional workshops and DIY mechanics who replace or repair factory head units, this radio restores factory audio functions and original dashboard appearance.
Technical Information
- Manufacturer: Blaupunkt
- Model: RD4
- Product Codes: 9660646877
- Other Numbers: 9659138977, 9647521077, 657932, 6579PC
Compatibility
Commonly fitted to: Citroën C2, Citroën C3 (first generation), Citroën C4, Citroën C8, Peugeot 207, Peugeot 307 II, Peugeot 807. Always cross-check the unit faceplate and connector layout against the vehicle before installation.
Function and Features
The RD4 unit provides FM/AM radio reception and CD playback with the standard RD4 control interface used across many PSA vehicles. When correctly programmed, it integrates with the vehicle’s audio system and maintains original dashboard ergonomics.
Installation
Basic replacement steps:
- Disconnect the vehicle battery before starting work to avoid short circuits and protect electronic modules.
- Remove surrounding trim panels carefully to access the head unit retaining screws.
- Unscrew the unit, pull it out gently and disconnect the antenna and wiring harnesses.
- Fit the replacement unit, reconnect harnesses and antenna, secure with screws and reinstall trim.
- Program the radio to the vehicle using PSA diagnostic tools (DiagBox/Lexia/PP2000) to restore full functionality and anti-theft alignment.
Installation Recommendations
Always follow manufacturer procedures and safety precautions. If you are not experienced with vehicle electronics, programming or dashboard removal, entrust the final coding and setup to a qualified technician with PSA diagnostic equipment. Before disconnecting any connectors, ensure you have a clear workspace and the correct tools to avoid damaging plastic clips or connectors.
Most Common Failure Reasons
- Worn or jammed CD mechanism caused by age and frequent use.
- Electrical surges or poor battery connection causing internal electronic faults.
- Corroded or loose connector pins and antenna connections leading to intermittent operation.
- Moisture ingress from leaks or high-humidity environments damaging internal components.
- Firmware or configuration issues that require reprogramming with diagnostic tools.
Expected Service Life
Service life depends on usage and vehicle environment. Many RD4 units remain operational for many years, but mechanical parts such as the CD mechanism and age-related electronic degradation make failures more likely after long service (typically many years of use).
Notes
This unit is supplied as indicated by the part numbers above. The radio requires vehicle-specific programming to enable full functionality and anti-theft alignment.
