Description
BLAUPUNKT RD4 CD car radio for Citroën and Peugeot vehicles. The radio must be coded to the vehicle via diagnostic programming.
Replace or upgrade your workshop or DIY project with this original-style RD4 N1-02 CD head unit, commonly fitted to a range of Citroën and Peugeot models. Searched frequently under part number 9664769677, this unit provides factory-fit radio and CD playback functionality in the familiar RD4 form factor. Ideal for mechanics and experienced home installers, the unit restores in‑car entertainment while retaining compatibility with vehicle wiring harnesses and dashboard mounting points when correctly installed and coded.
Technical Information
- Manufacturer: Blaupunkt (OEM for Stellantis/Citroën/Peugeot)
- Model: RD4 N1-02 CD
- Product Codes: 9664769677
- Additional Numbers: 657932, 6579PC
Compatibility
Commonly compatible with a number of Citroën and Peugeot vehicles including (but not limited to): Citroën Berlingo (B9), Citroën C2, Citroën C3, Citroën C3 Picasso, Citroën C3 Pluriel, Citroën C4; Peugeot 207, Peugeot 307 (including Mk2), Peugeot Partner Tepee and certain other PSA models that use the RD4 head unit platform. Always confirm fitment by part number when planning the replacement.
Installation Recommendations
- Disconnect the vehicle battery before starting work to avoid short circuits and to protect vehicle electronics.
- Remove surrounding trim panels carefully to access the head unit; use appropriate trim tools to avoid damage to clips and panels.
- Unplug the antenna and wiring harness. If available, use an ISO adapter harness to simplify connection to aftermarket test benches or wiring looms.
- Physically fit the unit into the DIN slot and secure with original mounting brackets or equivalent hardware.
- After mechanical installation, the unit must be coded/programmed to the vehicle using PSA diagnostic equipment (e.g. DiagBox/Lexia) or an equivalent professional tool to restore radio security functions, steering wheel controls and proper integration.
- Installation is suitable for professional technicians and experienced DIYers. For reliable coding and full recovery of vehicle functions, use a workshop with appropriate PSA diagnostic tools.
Why This Part Fails Most Often
- Mechanical wear of the CD mechanism leading to read errors or tray/jamming problems.
- Water ingress or high humidity causing corrosion on connectors or internal circuit boards.
- Faulty wiring, poor ground connections or antenna faults resulting in weak/absent reception.
- Electrical surges or battery disconnection during operation damaging internal electronics.
- Loss of coding or immobilizer pairing after unit replacement, which prevents the radio from powering up until properly coded.
Part numbers like 9664769677 are commonly used when searching for the correct RD4 unit—use them to quickly locate the correct replacement. Proper installation and diagnostic coding will ensure the unit functions as originally intended and integrates with vehicle controls.
