Blaupunkt RD4 T5 N2 is a direct-fit OEM-style head unit commonly found in Stellantis vehicles such as Citroën C8 and Peugeot 807. This radio offers a compact single-DIN body with CD playback and factory integration features. If you are searching by part number, use identifiers 9660646577, 6564QT, 6564QV or 6579PS to quickly find compatible replacements. The unit’s OEM mounting and connector layout make it suitable for professional workshops and experienced DIY mechanics who perform radio swaps and vehicle coding.

Technical Information

Manufacturer: Blaupunkt

Model: RD4 T5 N2

Product Codes: 9660646577, 6564QT

Additional Numbers: 6564QV, 6579PS

Function and Features

This is a CD car radio designed for factory integration in Citroën and Peugeot models. Key functional points: CD playback, FM/AM radio reception, and two antenna inputs to support diversity reception or a separate amplified antenna feed. The unit communicates with the vehicle’s electrical system and may require software pairing (coding) to restore full functionality after replacement.

Compatibility

Commonly fitted to Citroën C8 and Peugeot 807 models equipped with the RD4 head unit. When searching for this part, customers and technicians often use the part numbers listed above for fast identification.

Replacement Procedure (How To Replace)

• Disconnect the vehicle battery or ensure ignition is off to avoid short circuits during removal.
• Carefully remove the trim surrounding the head unit using plastic trim tools to avoid damage to panels.
• Release the radio using the appropriate removal keys or undo the retaining screws, then slide the unit out of the dash.
• Disconnect all electrical connectors, antenna plugs (note there are two), and any external amplifier leads.
• Install the replacement unit by connecting harnesses and antenna leads in the correct positions, slide the radio into the bracket and secure it.
• Perform vehicle coding/registration with a diagnostic tool so the radio is recognized by the vehicle’s systems and steering wheel controls (if fitted).
• Verify radio, CD playback and antenna reception, then reassemble trim panels and reconnect the battery if disconnected.

Installation Recommendations

Always use the correct removal keys or service tools to prevent damage to the radio and dash trim. Label connectors during removal if uncertain about their locations. Ensure both antenna plugs are fully seated; poor antenna connections are a frequent cause of weak reception. After mechanical installation, use a dealer-level or professional diagnostic tool to code the radio to the vehicle—without coding some functions (e.g., vehicle integration, steering wheel controls) may not work. Check and, if necessary, replace retention screws or mounting brackets that are corroded or damaged to ensure secure fitment.

Common Causes Of Failure

Typical reasons these head units fail include mechanical wear of the CD mechanism from heavy use, moisture ingress or condensation causing corrosion on connectors or internal components, electrical surges or poor grounding, and intermittent faults due to damaged antenna connectors. Faulty wiring or blown fuses in the vehicle’s audio circuit can also render the unit inoperative. Regular diagnostics of antenna continuity and power/ground feeds helps pinpoint issues before they cause permanent damage.

Why This Part Is Searched By Part Number

Technicians and DIYers frequently search by OEM numbers (9660646577, 6564QT, 6564QV, 6579PS) because they guarantee compatibility with the vehicle’s dashboard and connector layout. Including these codes in your search improves the chance of finding the exact fitment and saves time during replacement.

This description is aimed at professionals and experienced DIY mechanics who need clear technical data, installation guidance and compatibility references when replacing an OEM Blaupunkt RD4 T5 N2 radio in Citroën and Peugeot vehicles.

Replace your factory radio with this Blaupunkt RD4 T5 N2 unit — a direct-fit OEM-style head unit commonly found in Citroën C8 and Peugeot 807 models. This radio supports CD playback and retains the original dashboard appearance and mounting points, making it a practical choice for professional garages and experienced DIY enthusiasts. Many technicians and owners search for this unit by its product numbers, so the listing includes all common reference codes to simplify finding the correct replacement.

Technical Information

• Manufacturer: Blaupunkt
• Model: RD4 T5 N2
• Product Codes: 9659140077, 6564QT, 6564QV, 6579PS
• Other Numbers: RD4; T5; N2

Installation Recommendations

Before starting any work, Disconnect The Negative Battery Terminal. Remove Trim Panels Carefully To Access The Radio Cage. Unscrew The Unit And Disconnect All Wiring Harnesses And Antenna Connectors. Inspect Wiring And Connectors For Corrosion Or Bent Pins. Fit The Replacement Unit Securely, Reconnect Antennas And Power, And Reinstall Trim. After Mechanical Installation, The Radio Must Be Coded/Registered To The Vehicle With A Diagnostic Tool To Restore Full Functionality (Security Coding And Retained Settings). Verify Relevant Fuses And Vehicle Grounds If The Unit Does Not Power Up.

Why This Part Most Often Fails

• Wear In The CD Mechanism Causing Read Errors Or Failure
• Internal Component Age (Capacitors, Solder Joints) Leading To Power Or Audio Loss
• Water Ingress Or Moisture Damage From Leaks Around The Dashboard
• Corroded Or Damaged Connector Pins Resulting In Intermittent Power Or Speaker Output
• Faulty Antenna Connections Affecting Reception — Two Antenna Inputs Can Mask A Single Fault During Diagnostics
• Security Locking And Coding Issues After Battery Disconnect Or Unit Replacement

Notes For Technicians And DIY Enthusiasts

This unit Is Frequently Searched Under The Product Codes Listed Above, So Confirm The Part Number Matches The Vehicle Requirement Before Installation. Retaining Vehicle Functions Such As Steering Wheel Controls, Phone Integration, And Display Messages May Require Proper Coding Using The Manufacturer Diagnostic Interface. When Replacing The Radio, Check Antenna Leads And Grounds To Ensure Reliable Reception, And Test All Functions After Coding To Confirm Correct Operation.