Description
BLAUPUNKT RD4 CD car radio for Citroën and Peugeot vehicles. The radio must be coded/paired to the vehicle using diagnostic equipment.
Replacement BLAUPUNKT RD4 CD head unit designed as a direct-fit option for many Citroën and Peugeot models. Ideal for workshops and experienced DIY enthusiasts who need a reliable OEM-style radio with CD playback and standard FM/AM reception. The unit restores in-car audio functionality to factory specification and is commonly searched by part number (see Technical Information below), which makes identification quick and precise.
Compatibility
Commonly used in the following models (check the product codes below to confirm fit):
- Citroën C2
- Citroën C3 (first generation)
- Citroën C4
- Peugeot 207
- Peugeot 307 II
- Peugeot 807
- Citroën C8
Technical Information
- Manufacturer: Blaupunkt
- Model: RD4 CD
- Product Codes: 9660646877, 9659138977, 9647521077
- Additional Numbers: 657932, 6579PC
Installation Recommendations
- Always disconnect the battery before removal or installation to avoid electrical damage and potential fault codes.
- Remove surrounding trim panels carefully to access the radio retaining screws. Slide the unit out of the dash, then unplug the antenna and wiring harness connectors.
- When installing, reconnect harnesses and antenna securely, fit the unit into the dash, and refit trim panels. Reconnect the battery only after the unit is mechanically secured.
- The radio must be coded/paired to the vehicle using diagnostic equipment. Coding/pairing is required to restore full functionality; perform this step with appropriate PSA diagnostic tools or by a technician familiar with PSA systems.
- Match the product code printed on the unit with the codes listed above to ensure correct compatibility and connector type before installation.
Most Common Causes Of Failure
- Electrical Issues: Voltage spikes, poor ground, or intermittent battery connections can damage internal electronics or corrupt software, leading to loss of function.
- Wear And Tear: Frequent use of the CD mechanism can cause mechanical wear; dust and humidity accelerate failures in optical and mechanical components.
- Connector Or Wiring Problems: Corroded connectors, broken pins, or damaged antenna leads produce reception problems or complete failure of the unit.
- Software/Configuration: Units that are not correctly coded to the vehicle may not operate fully or may lose steering wheel control integration and other vehicle-linked functions.
Additional Notes
This unit is typically identified and ordered by its part number. Before installation, verify the product code on the replacement unit matches the code on the original radio to avoid connector or functionality mismatches. Suitable for professional fitting; recommended for mechanics and skilled DIYers familiar with vehicle electronics and PSA diagnostic procedures.
