Description
Blaupunkt RD4 CD car radio for Citroën and Peugeot vehicles. The radio must be coded to the vehicle using diagnostic equipment.
High-quality Blaupunkt RD4 CD OEM radio unit designed for a range of Citroën and Peugeot models. This unit is commonly fitted as original equipment and appears under multiple PSA part numbers, making it a frequent replacement for workshops and DIY enthusiasts. It supports CD playback, AM/FM radio and integrates with vehicle systems when properly programmed. Ideal for mechanics and home mechanics looking for a direct-fit replacement with genuine OEM cross-references.
Key Features
- OEM Blaupunkt RD4 CD unit used by Citroën/Peugeot.
- Supports CD playback and standard radio functions (AM/FM).
- Direct-fit replacement for multiple PSA models — plug-in electrical connectors and mounting points.
- Requires diagnostic coding/programming to restore full functionality and disable theft protection.
- Commonly searched by OE numbers (useful for fast lookup in parts systems).
Technical Information
- Manufacturer: Blaupunkt (OEM for Citroën/Peugeot)
- Model: Citroën C2, Citroën C3 (I), Citroën C4, Citroën C8, Peugeot 207, Peugeot 307 (II), Peugeot 807
- Product Codes: 9659138977, 9647521077, 9660646877
- Other Numbers: 657932, 6579PC
Compatibility And Fitment Notes
Fits a range of PSA vehicles where the RD4 CD radio was originally installed. Always check the physical connector layout and bracket positions when replacing to ensure plug-and-play installation. This radio is frequently listed under the OE numbers above and under model groups for Citroën and Peugeot compact and mid-size cars.
Installation Recommendations
– Before starting work, disconnect the vehicle battery to avoid short circuits and protect vehicle electronics.
– Remove trim panels and use the correct radio removal keys or tools to extract the unit without damaging the dash.
– Unplug all connectors carefully, note antenna and auxiliary leads, and transfer any OEM brackets or trim pieces to the replacement unit if necessary.
– Install in reverse order and ensure connectors seat fully. Reconnect the battery only after physical installation is complete.
– The radio must be coded/initialized with a PSA-compatible diagnostic tool (DiagBox/PP2000/Lexia) to unlock anti-theft protection and restore full functionality (steering wheel controls, presets, etc.).
Most Common Failure Reasons
- Anti-theft lock or coding mismatch after replacement — unit appears dead or limited until properly programmed.
- CD mechanism wear or mechanical failure from frequent use or foreign objects in the tray.
- Connector corrosion or poor grounding causing intermittent power or audio issues (common in older vehicles or after water ingress).
- Failed internal components such as display/backlight or power supply capacitors due to age and thermal stress.
- Blown fuse in the vehicle wiring or damaged antenna connection can mimic radio failure.
Practical Tips For Workshops
- Keep diagnostic equipment ready — many of these units require coding to clear theft lock and restore presets.
- Check fuses and connector pins before condemning the radio; many faults are simple to diagnose at the harness level.
- When supplying a used or exchanged unit, verify the part numbers match the vehicle’s original references to minimize programming issues.
- Label removed screws and trim pieces during disassembly to speed up reassembly and avoid dash rattles.
Keywords
Blaupunkt RD4 CD, Citroën radio, Peugeot radio, 9660646877, 9647521077, 9659138977, 657932, 6579PC, OEM radio replacement
