Replace Your Vehicle’s Original RD4 Head Unit With A Direct-Fit Blaupunkt RD4 CD Radio (OE-Fit For Citroën/Peugeot). This unit Is A Robust Option For Workshops And Experienced DIYers Looking For An OEM-Style Replacement: It Provides Reliable Radio Reception And CD Playback In Vehicles Where The RD4 Standard Was Factory-Fitted. Ideal For Mechanics Searching By Part Number (9664769677, 657932, 6579PC, N1-02), The Unit Integrates With Original Wiring Harnesses And Preserves Factory Aesthetics When Properly Installed And Coded.

Technical Information

Manufacturer: Blaupunkt / Stellantis (Original Equipment)

Model: RD4 N1-02 (CD)

Product Codes: 9664769677

Other Numbers: 657932, 6579PC, N1-02

Compatible Models

Citroën Berlingo (B9), Citroën C2, Citroën C3, Citroën C3 Picasso, Citroën C3 Pluriel, Citroën C4, Citroën C8, Peugeot 207, Peugeot 307 II, Peugeot 807, Peugeot Partner Tepee.

Function And Typical Faults

The RD4 Head Unit Provides AM/FM Radio Reception And CD Playback With Integration Into The Vehicle’s Electrical System. Common Failure Modes Include Faulty CD Mechanism (Mechanical Wear Or Jamming), Display Or Button Malfunctions Due To Age, Power Loss From Blown Fuses Or Corroded Connectors, And Software/Immobiliser Locking That Requires Diagnostic Pairing To Restore Full Functionality. Electronic Components Such As Electrolytic Capacitors May Degrade Over Time, Causing Intermittent Power Or Audio Issues.

How Often Units Fail And Why

Failures Are Most Likely In Vehicles Older Than A Decade, Especially Where Units Have Been Exposed To High Humidity, Temperature Cycles, Or Frequent Use Of The CD Mechanism. Mechanical Wear On Moving Parts (Tray/Spindle/Laser) And Connector Corrosion Are The Most Frequent Causes. Electrical Faults Caused By Poor Grounding Or Aftermarket Modifications Can Also Lead To Unit Malfunction.

How To Replace

1. Disconnect The Negative Terminal Of The Battery Before Starting Work To Avoid Short Circuits Or Data Loss.
2. Remove Surrounding Trim Panels Carefully Using Plastic Trim Tools To Avoid Damage.
3. Unscrew The Factory Head Unit Fasteners And Slide The Unit Out Gently.
4. Disconnect The Antenna Cable, Wiring Harnesses, And Any Additional Connectors (Steering Wheel Control, Microphone If Present). Inspect Connectors For Corrosion Or Bent Pins.
5. Install The Replacement Unit By Reversing The Procedure: Connect Harnesses, Secure The Unit, Refit Trim.

Pairing And Coding

This Radio Requires Diagnostic Pairing/Coding To The Vehicle. Pairing Is Typically Performed With A Compatible PSA Diagnostic Tool (DiagBox/Lexia/PP2000) Or Equivalent Workshop Equipment To Unlock Features And Ensure Proper Communication With The Vehicle’s Bus Systems. If The Unit Is Not Coded, It May Remain Locked Or Exhibit Limited Functionality.

Installation Recommendations

Installations Should Be Performed By Experienced Technicians Or Skilled DIYers Familiar With PSA Electrical Systems. Check And Replace Any Blown Fuses Before Assuming The Radio Is Faulty. Ensure All Earth Connections Are Clean And Tight. If Retaining Steering Wheel Controls Or Other Vehicle Integrations, Verify That Adapters Or Interface Modules Are Compatible With The RD4 Standard. After Installation, Perform Diagnostic Pairing And Verify Radio, Antenna, And Control Functions.

Reason Why The Part Most Commonly Fails

The Most Common Reason For Failure Is Mechanical Wear Of The CD Mechanism And Connector Corrosion Leading To Power Or Signal Loss. Environmental Factors (Moisture, Heat), Age-Related Component Degradation, And Electrical Issues Caused By Poor Grounds Or Aftermarket Modifications Are Frequent Contributors.

This OEM RT3 T6-N3 head unit is a direct-fit factory radio/navigation system originally installed in the Peugeot 307. It combines a CD player, HDD-based navigation and GSM connectivity in a single unit, providing reliable in-dash navigation, audio playback and integrated vehicle controls. Designed for professional garages and experienced DIYers, this unit retains the original vehicle look and wiring harness compatibility when the correct product codes match. Commonly searched by reference numbers 96640238XT and 6574CK/6574CJ, it is a popular replacement for owners restoring original infotainment functionality.

Technical Information

• Manufacturer: Stellantis (Peugeot/Citroën)
• Model: Peugeot 307 (2006) – RT3 T6-N3 Head Unit
• Product Codes: 96640238XT
• Additional Numbers: 6574CK, 6574CJ, 6574CK NFP

Compatibility

Primarily fitted to Peugeot 307 vehicles equipped with the RT3 infotainment option. Ensure the unit product codes match the original part numbers in the vehicle to guarantee electrical and connector compatibility. This unit corresponds to factory RT3 installations and is intended for vehicles from the same model generation.

Installation Recommendations

• Disconnect the negative battery terminal before starting to prevent short circuits and to protect the unit’s memory.
• Remove surrounding trim panels carefully to avoid breaking plastic clips. Use appropriate trim tools.
• Unscrew the head unit and disconnect all harnesses, antenna and any external modules (microphone, GPS antenna) before removal.
• Transfer any mounting brackets or carrier frames from the donor unit if required by the vehicle.
• After mechanical installation, coding/configuration is required: the radio must be coded to the vehicle using diagnostic equipment (DiagBox/PP2000 or equivalent) to enable full functionality and integration with vehicle systems.
• Avoid powering the unit while connectors are disconnected and prevent mechanical shocks to the HDD portion during handling.

How To Replace On Vehicle

1. Turn ignition off and disconnect the negative battery terminal.
2. Remove center console trim panels to expose the radio mounting bolts.
3. Remove radio mounting screws and gently slide the unit out of the dash.
4. Disconnect wiring harnesses, antenna cable and any external module plugs (GPS, microphone, etc.).
5. Fit the replacement unit, reconnect all connectors and secure the unit in place.
6. Reassemble trim, reconnect the battery and perform diagnostic coding to register the head unit with the vehicle’s systems.

Why The Part Fails Most Often

• HDD Failures: Mechanical hard drives in older RT3 units suffer from wear, vibration and eventual mechanical failure, causing navigation data loss or boot issues.
• CD Mechanism Wear: The CD drive can seize or fail due to worn belts/lasers after years of use.
• Firmware Corruption: Interrupted updates or power loss during flash operations can corrupt software, requiring reprogramming or firmware recovery.
• Connector Corrosion: Moisture and poor contacts at harness connectors lead to intermittent faults or loss of functions.
• Overheating And Aging Electronics: Long-term thermal stress can degrade capacitors and solder joints, causing display or audio failures.

Practical Tips

• When replacing an HDD-equipped unit, handle gently and consider imaging the drive if you need map or user data recovery.
• If the unit exhibits software faults, a full diagnostic session and software reflash with PSA tools often resolves issues that are not hardware-related.
• Professional coding with DiagBox/PP2000 is recommended to restore functions such as steering-wheel controls, vehicle settings and radio authorization.

This unit is suitable for professional fitters and competent DIY mechanics comfortable with dash disassembly and ECU-level coding. Check product codes above to confirm direct compatibility with your vehicle’s original unit.

The Siemens VDO RD4 N1-00 is a direct-fit factory head unit used across a range of PSA Group vehicles. This single-DIN unit combines AM/FM radio with a front-loading CD player and full integration with vehicle controls, providing reliable in-car entertainment and RDS station identification. Ideal for workshops and DIY mechanics replacing an original RD4 unit, this part restores factory functionality and keeps steering wheel controls and dashboard integration intact (when fitted on the vehicle).

Key Benefits

• Direct OEM fit for many Citroën and Peugeot models — preserves original look and control functions.
• CD playback and RDS radio for clear station and track information.
• Retains steering wheel audio controls and display information where vehicle wiring and equipment allow.
• Sold under manufacturer reference numbers commonly searched by mechanics and parts buyers.

How It Works And What It Does

The RD4 N1-00 is the factory radio unit responsible for radio reception, CD playback and communicating basic audio commands to the vehicle’s audio system. In vehicles equipped with steering wheel controls or multifunction displays, the unit exchanges data over the vehicle bus to show station and track info and to respond to user inputs from the steering wheel.

Replacement Procedure (Overview)

• Disconnect the vehicle battery before starting work to avoid short circuits and unit damage.
• Remove trim panels surrounding the radio, then extract the head unit using the appropriate removal keys or fastener removal tools.
• Unplug the antenna connector and the vehicle wiring harness connectors from the rear of the unit.
• Fit the replacement unit, reconnect the antenna and wiring harness, reassemble trim and reconnect the battery.
• Perform diagnostic pairing/programming so the radio is authorized and fully functional within the vehicle’s electronic network.

Recommended Installation

Disconnect the battery and follow the vehicle manufacturer’s removal procedure to avoid damage. Because the RD4 radio must be paired/programmed to the vehicle electronics, we recommend using PSA diagnostic equipment (DiagBox/Lexia) or having the final coding performed by a workshop with the appropriate tools. Proper coding ensures the unit is fully integrated with the vehicle’s controls and prevents audio or authorization errors.

Common Failure Causes

• CD Mechanism Wear: Mechanical parts and optical reading components in the CD drive degrade over time, causing read errors or inability to load discs.
• Power Supply Issues: Corroded contacts, blown internal fuses or voltage spikes can lead to intermittent power loss or complete unit failure.
• Button/Display Wear: Frequent use and sun exposure can cause faded displays, unresponsive keys or backlight failure.
• Software/Authorization Problems: Units that are not coded to the vehicle may display errors or be locked; diagnostic programming is required to restore full operation.

Technical Information

• Manufacturer: Siemens VDO
• Model: RD4 N1-00
• Product Codes: 96624490XT, 16077504XT, 6564AK
• Other Numbers: N1-00

Why Choose This Unit

For workshops and experienced DIY mechanics replacing a factory RD4 radio, this Siemens VDO unit restores original functionality and appearance. It is suitable for vehicles listed in the compatibility section and is frequently referenced by its product codes in parts searches, making it easy to identify and order the correct replacement.

Compatibility (Examples)

Commonly fitted to Citroën models: Berlingo III, C2, C3, C4, C8. Commonly fitted to Peugeot models: 207, 307, 407, 807, Partner III. Always confirm the unit’s reference number matches the original unit on the vehicle before installation.

Final Notes

This unit requires diagnostic pairing/programming to the vehicle. Follow safe working practices when removing and installing the head unit to avoid damage to connectors and vehicle electronics.

Product Description

High-quality OEM Continental RD4N1M CD head unit with MP3 playback designed for many Citroën and Peugeot models. This unit offers reliable radio reception, CD playback and MP3 file support from CD media. It is a direct-fit replacement for vehicles equipped with the original RD4N1M system, making it suitable for workshops and experienced DIY mechanics who need an OE-style audio solution.

Fitment And Compatibility

Common fitment includes Citroën and Peugeot models such as Citroën C2, C3 I, C4, C8 and Peugeot 207, 307 II, 807. The unit is often referenced by OE/product numbers and may be listed under multiple part codes—check the numbers below when searching or ordering.

How It Works And What It Does

The unit functions as an in-dash radio tuner and CD player with MP3 playback capability. It provides audio output to the vehicle speaker system and connects to the vehicle wiring harness and antenna. In many vehicles the head unit must be coded/programmed to the car’s electronics to restore full functionality (see technical note below).

Replacement Procedure (Step-by-step)

1. Before starting, disconnect the vehicle battery to avoid short circuits and protect vehicle electronics.
2. Remove surrounding trim panels carefully using appropriate trim tools to avoid damage.
3. Unscrew and slide the head unit from the dash using the correct removal keys or screws.
4. Unplug the main wiring harness(es), antenna connector and any auxiliary or microphone leads.
5. Install the replacement unit by reversing the removal steps: connect harnesses, secure the unit, re-fit trim and reconnect the battery.
6. Perform the required diagnostic coding/programming so the radio is recognized and fully functional with the vehicle systems.

Installation Recommendations

Always disconnect the battery prior to removal/installation and follow the vehicle manufacturer’s service procedures to avoid damage. Because this radio requires diagnostic coding to the vehicle, coding should be performed with appropriate PSA diagnostic tools. If you are not experienced with PSA programming tools, we recommend installation and coding by a professional workshop equipped for Citroën/Peugeot diagnostics.

Technical Information

Manufacturer: Continental
Model: RD4N1M (CD with MP3)
Product Codes: 9665751777
Additional Numbers: 657992, 657990, 657989, 657937, 657935, 657934, 6579PC

Common Failure Causes

Failures typically result from mechanical wear in the CD mechanism, dust or debris in the loader, moisture ingress or corrosion on connector pins, intermittent power supply (blown fuses or poor ground), and age-related electronic component failures (capacitors, solder joints). Units swapped between cars without proper diagnostic coding can exhibit limited functionality until they are correctly programmed.

Why Choose This Unit

This Continental OE head unit is the correct replacement for vehicles originally fitted with the RD4N1M system and preserves factory look and operation. It is suitable for mechanics and competent DIYers who can perform physical replacement and arrange required diagnostic coding.

This RT3-N3-09 multimedia head unit is an original factory radio from Stellantis (Peugeot/Citroën) designed for vehicles equipped with the RT3 system. It combines CD playback, integrated navigation and GSM connectivity in one OE housing. Ideal for mechanics and experienced DIY enthusiasts looking for a direct replacement unit that preserves original vehicle functions and maintains factory integration with the vehicle systems.

Key Features

• OE RT3-N3-09 head unit with CD player and integrated navigation.
• GSM-capable module for telematics/voice services where supported by vehicle.
• Designed to fit Peugeot 307 vehicles that originally came with the RT3 system.
• Original part numbers and markings ensure direct physical compatibility with factory harnesses and mounting.

Technical Information

• Manufacturer: Stellantis / Peugeot / Citroën
• Model: RT3-N3-09 (from Peugeot 307, 2006)
• Product Codes: 96632917XT, 657465
• Other Numbers: NFP

Compatibility

Fits Peugeot 307 vehicles equipped originally with the RT3 RT3-N3-09 head unit (example: Peugeot 307 2006). Compatibility is typically identified by the head unit model code (RT3) and OE part numbers such as 96632917XT or 657465. Ensure the vehicle originally had the RT3 system to avoid wiring or CAN-bus mismatches.

Installation Recommendations

• Always disconnect the vehicle battery before removal or installation and follow the manufacturer’s safety procedures.
• Remove surrounding trim panels carefully to avoid breakage; use proper trim tools.
• Unplug antenna and all wiring harness connectors; note connector positions and retain all screws for reinstallation.
• Install the unit in reverse order. After mechanical installation, the radio must be coded/programmed to the vehicle using a diagnostic tool.
• Coding/initialization is usually required to restore full functionality (radio recognition, navigation, GSM, steering wheel controls). Use appropriate PSA diagnostic equipment or have the procedure performed by a qualified technician.

How Replacement Is Performed

1) Disconnect negative battery terminal and wait a short period to ensure systems are de-energized. 2) Remove dashboard trim and unscrew the original head unit. 3) Carefully unplug all connectors (power, speaker, antenna, CAN/communication plugs). 4) Fit the replacement unit, reconnect connectors and antenna, refit trim and screws. 5) Power up and perform required coding/programming so the vehicle recognizes the new unit.

Why This Part Fails

Head units commonly fail due to age-related wear, failing internal components (such as capacitors or CD mechanism), moisture ingress or corrosion on connectors, firmware issues, and power surges. Mechanical wear of the CD loader and exposure to heat or humidity are frequent causes. Proper handling during removal/installation and ensuring dry, vibration-controlled mounting can extend service life.

Service Life And Practical Notes

Longevity depends on usage and environment. Many factory head units remain serviceable for a decade or longer; however, moving parts (CD mechanism) and electronic components can degrade over time. When replacing, use original OE coded units where possible and perform required programming to avoid faults or limited functionality.

Recommended For

Automechanics and experienced DIYers replacing a faulty RT3 unit in a Peugeot 307 who require an OE-quality multimedia system with navigation and GSM capability. The unit is especially useful when matching OE part numbers (96632917XT / 657465) is important.

This OEM Siemens VDO RD4N1-02 CD radio is a direct-fit replacement for a range of Citroën and Peugeot models. Ideal for professional workshops and experienced DIY mechanics, the unit restores full factory functionality and maintains original dashboard aesthetics. The radio is commonly searched by its part numbers, so listing the codes below helps you find the exact match quickly.

Compatibility And Use Case

Designed for original equipment fitment in Citroën and Peugeot cars listed below. Suitable for vehicles that require the RD4N1-02 radio platform and factory connector interfaces. Recommended for replacing faulty factory radios with CD mechanism or radio units that lost pairing/programming with the vehicle.

Technical Information

• Manufacturer: Siemens VDO
• Model: RD4N1-02 (CD Radio)
• Product Codes: 96647697XT, 16077504XT, 6564ZS, 6564ZT
• Other Numbers: RD4N1-02

Compatible Models

• Citroën Berlingo III
• Citroën C2
• Citroën C3
• Citroën C4
• Citroën C8
• Peugeot 207
• Peugeot 307
• Peugeot 407
• Peugeot 807
• Peugeot Partner III

Installation Recommendations

• Before starting, disconnect the negative terminal of the battery to avoid short circuits and protect vehicle electronics.
• Remove trim panels and radio surround using appropriate plastic trim tools to prevent damage to trim pieces.
• Unscrew mounting bolts and gently slide the radio from the dash. Carefully unplug all electrical connectors and the antenna lead.
• Inspect connectors and wiring for corrosion or damage. Replace any brittle wiring or corroded terminals before installing the replacement unit.
• Fit the new radio, reconnect antenna and electrical plugs, secure mounting bolts and refit trim panels.
• After mechanical installation, the radio must be programmed/paired to the vehicle with diagnostic equipment to restore full functionality and remove anti-theft locks. Use dealer-level or PSA-compatible diagnostic tools (e.g., DiagBox/PP2000) or equivalent workshop equipment for coding.
• Reconnect the battery only after reassembly is complete. Verify radio operation, CD loading/ejection, and all audio functions before returning the vehicle to the customer.

Why This Part Most Often Fails

• Worn CD Mechanism: Frequent CD use accelerates wear of the tray, spindle motor and optical pickup, causing read errors or mechanical jams.
• Age-Related Electronic Failure: Electrolytic capacitors and solder joints can degrade over many years, leading to intermittent faults, loss of power or audio dropouts.
• Moisture And Corrosion: Water ingress or high humidity can corrode connectors and circuit boards, especially in vehicles exposed to damp conditions.
• Power Surges And Battery Events: Jump-starts, battery replacements or voltage spikes can damage internal electronics if correct procedures are not followed.
• Connector Damage: Broken antenna plug or harness pin damage during previous repairs often causes poor reception or loss of function.

Practical Notes For Mechanics

• Commonly searched by part numbers 96647697XT, 16077504XT, 6564ZS, 6564ZT and RD4N1-02 — keep these handy when sourcing the unit.
• Check the vehicle for previous repair evidence (wet seats, dashboard damage, aftermarket installations) that could have affected the original radio.
• Save time by verifying connector types and mounting dimensions before the job; the RD4N1-02 is an OEM-format unit but trim brackets and fascia may vary by model year.

How Often Failures Occur

Failures are more frequent on older vehicles (typically 8–15+ years) and in cars with heavy CD use or exposure to moisture. Electronic degradation and mechanical wear accumulate over time; proactive checks during scheduled service can help identify issues early.

Final Advice

This radio is intended for professionals and competent DIYers comfortable with dashboard disassembly and vehicle coding. When fitted and coded correctly, it restores factory radio functions and retains original vehicle appearance. If you require programming, ensure you have access to appropriate PSA diagnostic equipment or a qualified workshop to complete the pairing process.

OEM Continental RD4N1M head unit offering CD and MP3 playback, designed as a direct replacement for many Citroën and Peugeot models. This unit preserves original mounting, connectors and dashboard integration for a clean factory-like fit. Frequently searched by part numbers, it is intended for professional workshops and experienced DIY mechanics who perform vehicle electronics work and radio coding.

Technical Information

Manufacturer: Continental (Original Equipment for Citroën/Peugeot)
Model: RD4N1M CD
Product Codes: 9664769777, 657992
Additional Numbers: 657990, 657989, 657937, 657935, 657934, 6579PC, 96647697XT
Compatible Models: Citroën/Peugeot 207; 307 II; 807; C2; C3 I; C4; C8

Fitment And Use

This unit is an OEM-style replacement for the listed Citroën and Peugeot models. It mounts into the original radio slot and uses factory wiring plugs, retaining steering wheel control compatibility when properly coded. Many customers locate this radio by its product codes, so check the part number against the unit being replaced before installation.

Installation Recommendations

Before starting, always disconnect the negative battery terminal to avoid risk of short circuits or damage to vehicle electronics. Typical replacement steps:

• Carefully remove trim panels around the radio using appropriate plastic pry tools to avoid damaging the dash.
• Unscrew and slide the radio out of the cage, then disconnect antenna, power and speaker connectors.
• Transfer any brackets or harness adapters if required and connect the new unit in reverse order.
• Reconnect the battery only after the unit is secured and connectors are in place.

After mechanical installation, the radio must be programmed to the vehicle using diagnostic equipment to restore full functionality (coding and security pairing). If you do not have the required diagnostic tool, have the coding performed by a qualified workshop with PSA diagnostic capability.

Why Units Fail And Typical Lifespan

Head units like the RD4N1M can remain functional for many years, but failure rates increase with age and operating conditions. Common causes of malfunction include:

• Heat and prolonged sun exposure causing electronic component degradation.
• Moisture ingress or corrosion at connectors.
• Mechanical wear of the CD mechanism (sticking, skipping or failure to read discs).
• Power surges or interrupted supply during battery changes or jump starts causing software lockups.
• Aging capacitors or solder joints inside the unit.

Regular use, clean environment and careful battery handling extend service life.

Recommended Tools And Skills

Ideal for professional mechanics or experienced DIYers. Recommended tools include trim removal tools, Torx/screwdriver set and, for final commissioning, PSA-compatible diagnostic tool for coding. If steering wheel controls or other integrated functions are not working after installation, diagnostic coding is required.

Notes On Programming

This radio requires diagnostic programming to the vehicle to restore full functionality and security pairing. Make sure coding and initialization are performed by personnel with appropriate diagnostic equipment and experience.

Why Choose This Unit

If you want a factory-fit radio with CD and MP3 playback for your Citroën or Peugeot, the Continental RD4N1M offers direct compatibility with original dashboard integration and connector layout. Purchasing by part number listed above is common practice and helps ensure you receive the correct replacement unit.

High-quality Continental RD4N1M-03 CD/MP3 radio designed for many Stellantis Citroën and Peugeot models. This OE-style head unit is commonly searched by part numbers (96662669XT, 96662669XT03, 16077504XT) and fits vehicles where the RD4 system was originally specified. Ideal for mechanics and DIY enthusiasts who need a reliable replacement radio that preserves original functionality and vehicle aesthetics. The unit supports CD and MP3 playback and integrates with the vehicle’s factory wiring harness and steering wheel controls where applicable.

Compatibility

• Peugeot 207
• Peugeot 307 (II)
• Peugeot 807
• Citroën C2
• Citroën C3 (I)
• Citroën C4
• Citroën C8

Technical Information

• Manufacturer: Continental (Produced for Stellantis)
• Model: RD4N1M-03
• Product Codes: 96662669XT, 96662669XT03, 16077504XT
• Other Numbers: 6574PW, 6574PX

Installation Recommendations

• Always disconnect the battery before starting removal or installation to avoid electrical damage.
• Remove trim panels and unscrew the radio using appropriate radio removal keys or tools. Carefully pull the unit forward and disconnect the wiring harnesses and antenna connector.
• Check connector pins and wiring for corrosion or damage before mating the replacement unit.
• After physical installation, the radio must be coded/registered to the vehicle using PSA diagnostic tools (DiagBox/PP2000) to restore full functionality (radio enable, steering wheel control mapping, etc.).
• Test all functions (radio reception, CD/MP3 playback, steering wheel controls, mute/phone integration if present) before reassembling the trim.

How To Replace (Practical Steps)

1. Disconnect the negative battery terminal and wait a few minutes.
2. Remove surrounding trim and fasteners to access the head unit.
3. Use radio keys or appropriate tools to extract the RD4 unit from the dash.
4. Unplug the main wiring connector, antenna cable and any auxiliary plugs.
5. Install the replacement unit by reversing the removal steps, reconnect connectors and secure the radio.
6. Reconnect the battery and perform diagnostic coding with DiagBox/PP2000 to pair and activate the unit.

Most Common Failure Reasons

• Electrical Issues: Blown fuses, power surges or poor ground connections can cause loss of power or erratic behavior.
• Connector Corrosion: Moisture or road salt can corrode harness pins, leading to intermittent faults or audio dropouts.
• Mechanical Wear: The CD mechanism and loading tray are mechanical parts that wear over time and commonly fail on older units.
• Software/Locking: Unit may require diagnostic coding or unlocking after replacement; without coding the radio may be disabled or limited.
• Physical Damage: Impact, water ingress or exposure to high temperatures can permanently damage internal components.

Why Choose This Unit

Replacement RD4N1M-03 radios are a practical choice for maintaining factory appearance and integration. Supplying the correct part number (e.g., 96662669XT) in searches increases the chance of finding a direct-fit unit. For workshop efficiency, keep diagnostic equipment (DiagBox/PP2000) on hand to complete the coding step and avoid return visits.

Original Blaupunkt RD4 N1 MP3 car radio – 03 for Citroën/Peugeot (used). Ideal replacement for a non-functional unit in PSA models with on-board CAN network. Thanks to the OEM design, you will maintain full integration with the vehicle – controls on the steering wheel, displays on the on-board display, parking sensors and a hands-free/USB box (if it is in the car). Often searched under part numbers 9666403077, 6579FG, 6579PC.

Main advantages
– Original PSA/Blaupunkt part – no compromises in compatibility and sound
– CD/MP3 and RDS support, control on the steering wheel and display on the OEM display
– Full integration with BSI; possibility to set functions (parking sensors, amplifier, AUX/USB) by diagnostics
– Exact replacement for cars with RD4 – just adapt correctly (add to car)

Compatibility
– Citroën: C4 (I), other selected models with RD4 (e.g. C2, C3, C5 II, Berlingo B9) – always check against the OEM code
– Peugeot: 307 II (facelift), further cars with RD4 (e.g. 207, 308 I, 407, Partner B9) – always check against the OEM code
– Vehicle network: CAN (RD4)
– Physical compatibility: rear 1× Quadlock connector + 1× antenna connector (Fakra)
Tip: The surest verification is to compare the OEM numbers 9666403077, 6579FG, 6579PC and the connectors/old unit match.

Technical information
– Manufacturer/type: Blaupunkt RD4 N1 MP3 – 03
– Features: CD player with MP3 support, FM/AM tuner with RDS
– Power: approx. 4×15–20 W RMS (OEM standard)
– Communication: CAN-BUS, pairing via VIN (no PIN code)
– Connectivity: 1× Quadlock (power supply, speakers, CAN), 1× Fakra antenna
– Integration: OEM on-board display, control on the steering wheel; optional external amplifier (JBL) – set by diagnostics
– Part numbers (for search): 9666403077, 6579FG, 6579PC, RD4 N1 MP3

Important for assembly and coding
– The unit must be “added” to the car with diagnostics (e.g. Diagbox/Lexia/PP2000). Without VIN pairing, the radio will emit a warning tone (beep).
– As part of telecoding, set: body type, presence of parking sensors, external amplifier (JBL), AUX/USB, hands-free, etc.
– Recommended professional assembly and inspection of the condition of the connectors/installation in the car.

Package contents and condition
– Supplied as a bare RD4 car radio unit (without display, frame, steering wheel control, antenna or wiring).
– Used original part – see photos/specific condition. Compare with your old unit and OEM numbers before purchasing.

Search keywords
RD4 N1 MP3 Car Radio, Blaupunkt, 9666403077, 6579FG, 6579PC, Citroën C4, Peugeot 307 II, PSA OEM Car Radio, CD MP3, Quadlock, Fakra, CAN, Telecoding, VIN Matching.

High-quality roof mast antenna designed as a direct-fit replacement for a range of Citroën and Peugeot models. Ideal for professional garages and DIY mechanics, this antenna restores reliable AM/FM reception and matches original equipment part numbers 9650911180, 6561Y1, 6561A0 and 6561W5. The rugged rod design ensures stable reception and straightforward installation, making it a practical choice when the original mast is damaged, corroded or suffering from poor signal.

Features

• Rod-Type Mast: Simple, robust design for consistent radio reception.
• OEM Part Number Compatibility: Fits vehicles using part numbers 9650911180, 6561Y1, 6561A0, 6561W5.
• Easy Replacement: Designed for direct swap with factory mounting points and coax connector.
• Professional and DIY Friendly: Suitable for automechanics and experienced home mechanics.

Technical Information

• Manufacturer: Stellantis / Citroën / Peugeot
• Model: Citroën C5; Peugeot 307 (I / II); Peugeot 407
• Product Codes: 9650911180, 6561Y1, 6561A0, 6561W5
• Additional Numbers: 6561A0 | 6561W5 | 6561Y1 | 9650911180

Installation Recommendations

Remove the old mast by unscrewing it from the base and disconnecting the coaxial cable at the connector or under the trim. Inspect the antenna base, sealing gasket and surrounding roof area for corrosion or damage. Clean the mating surfaces and replace worn gaskets to ensure a watertight fit. Screw the new mast into the base by hand and then secure to a snug fit—avoid excessive torque to prevent thread or base damage. Reconnect the coaxial connector and test AM/FM reception and radio operation before reassembling any removed trim. Use basic hand tools; professional fitment is quick for an experienced technician.

Why This Part Most Often Fails

• Mechanical Damage: Mast bending or breaking from car washes, low-clearance obstacles or vandalism.
• Corrosion And Water Ingress: Salt and moisture lead to base corrosion or poor electrical contact.
• Connector Wear: Oxidation or loose coax connection causing intermittent reception or signal loss.
• Aging Materials: Rubber seals and gaskets harden over time, allowing moisture entry and electrical issues.

Fitment And Notes

This antenna is commonly fitted to Citroën C5 and Peugeot 307 / 407 applications using the listed OEM numbers. Customers frequently search by part number in repair shops and online catalogues, so listing the original codes helps find the correct replacement quickly. Always verify physical match (mounting type and connector) when replacing an aftermarket or non-original antenna.

Order this antenna mast to restore reliable radio reception and maintain the vehicle’s original appearance and function. Suitable for routine replacement during bodywork or when reception degrades due to damage or corrosion.