Description
BLAUPUNKT RD4 CD car radio for Citroën and Peugeot vehicles. The radio must be coded to the vehicle using diagnostic tools.
Product Overview
The Blaupunkt RD4 CD head unit is a direct-fit radio for many Citroën and Peugeot vehicles and is frequently sought under OEM part numbers. This unit provides reliable AM/FM radio reception, CD playback and integrates with the vehicle’s existing wiring and controls. Ideal for professional workshops and competent DIY mechanics who need a robust replacement radio with original-style operation.
Compatibility
- Citroën C2
- Citroën C3 / C3 Pluriel
- Citroën C4
- Citroën C8
- Peugeot 207
- Peugeot 307 II
- Peugeot 807
Technical Information
- Manufacturer: Blaupunkt (OEM For Stellantis / Citroën & Peugeot)
- Model: RD4 CD
- Product Codes: 9647521077, 9659138977
- Other Numbers: 657932, 6579PC
Features & Function
The RD4 CD unit offers standard factory radio and CD functions designed to match factory controls and dashboard fitment. It uses the vehicle’s wiring harness and antenna connection and communicates with the vehicle electronics for correct operation of steering wheel controls and on-screen information where supported.
How Replacement Is Done
Replacement is straightforward for a trained technician: remove the trim surrounding the radio, undo the mounting brackets or screws, pull the unit out and disconnect the antenna, power and speaker connectors. Install the replacement unit by reversing the steps, ensuring all plugs are fully seated and the antenna connection is secure. After mechanical installation the radio must be coded/paired to the vehicle with diagnostic equipment to restore full functionality.
Installation Recommendations
- Disconnect Battery: Always disconnect the negative battery terminal before starting to avoid electrical damage.
- Preserve Wiring: Retain original connectors and wiring adapters; avoid cutting factory harnesses where possible.
- Coding Required: The Unit Must Be Coded To The Vehicle Using Diagnostic Tools. Coding/Initialization Is Recommended To Be Performed With PSA Service Tools (DiagBox / Lexia / PP2000) To Restore Features Like Steering Wheel Control And Anti-Theft Locking.
- Professional Help: If You Are Not Equipped With PSA Diagnostic Tools Or Lack Experience With Coding, Have The Unit Installed And Coded By A Professional Workshop.
Why This Part Commonly Fails
- Mechanical Wear: CD mechanism and laser assemblies degrade over time, causing read errors or failure to load discs.
- Button / Control Failure: Frequent use and exposure to dust can cause failing knobs, buttons, or the front panel electronics.
- Electrical Issues: Loose connectors, blown fuses, poor grounding or vehicle electrical spikes can interrupt power to the unit.
- Loss Of Coding / Memory Corruption: In some cases the unit will lose stored settings or require re-coding after battery disconnection or electronic faults.
- Environmental Damage: Moisture Ingress Or High Temperatures Can Accelerate Component Failure.
Useful Notes For Buyers
Search By Part Number: This radio is commonly searched by its OEM references (9647521077, 9659138977, 657932, 6579PC) — include these numbers when matching to your vehicle. Ensure The Unit Matches The Dash Aperture And Connector Type For Your Model Year. Retain Any Original Mounting Brackets Or Trim Pieces For Proper Fit.
Why Choose This Unit
Replacing with an RD4 CD ensures compatibility with factory controls and maintains the vehicle’s original appearance and user experience. For workshops and experienced DIYers it provides a cost-effective way to restore radio and CD functionality while keeping integration with vehicle systems intact.
