Description
Car radio CONTINENTAL RD4 RD4N1M-03 CD for CITROËN and PEUGEOT vehicles. The radio must be coded to the vehicle using diagnostic equipment.
OE-quality Continental RD4 CD/MP3 head unit designed as a direct replacement for many Citroën and Peugeot models. This unit offers reliable CD and MP3 playback with factory-style fitment, preserving dash integration and original mounting points. Ideal for workshops and DIY mechanics who need an OEM‑matching radio that installs into the original slot and returns factory functionality once correctly coded.
Technical Information
- Manufacturer: Continental
- Model: RD4 / RD4N1M-03
- Product Codes: 96662669XT, 96662669XT03, 16077504XT
- Other Numbers: 6574PW, 6574PX
Compatible Models (Examples)
Commonly fitted to various Citroën and Peugeot vehicles, including but not limited to:
- Peugeot 207
- Peugeot 307 (including Mk2 / 307 II)
- Peugeot 807
- Citroën C2
- Citroën C3 I
- Citroën C4
- Citroën C8
Installation
- Always disconnect the battery before starting work to avoid electrical damage.
- Remove surrounding trim panels and any security fasteners to access the radio cage.
- Unscrew and slide the unit out of the dashboard, then disconnect the wiring harnesses and antenna connector.
- Fit the replacement radio by reversing the removal steps: reconnect harnesses, antenna and secure into the dash.
- After mechanical installation, the unit must be coded to the vehicle using appropriate PSA diagnostic software to restore full functionality.
Mounting And Coding – Important
The radio is a unit that requires coding to the vehicle via diagnostic equipment. Without proper coding the unit may remain locked or some vehicle-integrated functions may not operate. Coding and activation are typically performed with PSA diagnostic tools such as DiagBox, Lexia or PP2000. For reliable results, have coding performed by a technician with access to the correct PSA diagnostic equipment.
Why The Part Fails Most Often
- Electrical Issues: Voltage spikes, poor grounding or wiring faults can damage internal electronics.
- Connector Corrosion or Loose Connections: Moisture or vibration can cause intermittent operation or complete failure.
- Memory/Firmware Corruption: Flash memory faults or corrupted firmware can lead to lockups or loss of functionality; coding may be necessary after repair or replacement.
- Mechanical Wear: CD mechanism wear or optical pickup failure is common in older units with heavy CD use.
- Environmental Damage: Water ingress or long-term exposure to humidity accelerates failures.
Recommendations For Fitment
- Perform a full electrical check of fuses, power and ground supply before assuming the radio is faulty.
- Ensure all connectors and the antenna lead are clean and properly seated during installation.
- Use a PSA-compatible diagnostic tool to code and initialise the unit after installation to restore factory features and security state.
- If CD playback is required, check the mechanism operation before reassembly; for persistent mechanical failures consider professional service or replacement.
This replacement radio is a practical choice for workshops and experienced DIYers seeking an OEM-style unit for Citroën and Peugeot vehicles. Correct installation and proper coding are essential for full functionality.
