Overview

This original Continental RD4-series head unit (RD4N2M-03) is a direct-fit radio/CD player originally installed in Citroën C4 Picasso (2010) vehicles. It keeps factory features such as radio, CD playback and integration with the vehicle’s audio wiring and antenna. The unit is aimed at professional workshops and competent DIYers who need an OE replacement unit with original connectors and mounting footprint.

Function

The unit provides AM/FM radio reception and CD playback with factory integration into the vehicle’s audio and steering controls (where applicable). It relies on the vehicle’s data network and immobiliser/coding data to become fully operational after installation.

Technical Information

• Manufacturer: Continental
• Model: Citroën C4 Picasso (2010)
• Product Codes: RD4N2M-03, 96660456XT, 16077577XT
• Additional Numbers: 6574LW

Compatibility

Commonly fitted to Citroën C4 Picasso (model year 2010) with RD4-type head unit. The unit may also be compatible with other Stellantis vehicles that use the same RD4/Continental hardware and matching part codes. Check the unit’s part numbers against the original to confirm fitment before installation.

How To Replace

• Disconnect the vehicle battery before starting removal to avoid electrical damage and airbag faults.
• Remove surrounding trim panels carefully (plastic clips are often fragile) and unscrew the head unit mounting screws.
• Pull the unit forward and disconnect the harness connectors, antenna lead and any external amplifiers or CAN/data plugs.
• Fit the replacement unit by reversing the removal steps. Ensure connectors are fully seated and antenna connection is secure.
• After mechanical installation, the radio must be coded/paired to the vehicle using diagnostic equipment so that all functions and security features work correctly.

Installation Recommendations

• Always Disconnect Battery: Disconnect the negative battery terminal before removal and wait a few minutes to allow systems to power down.
• Use Proper Tools: Trim tools prevent damage to panels. Keep screws and clips organized for reassembly.
• Diagnostic Coding Required: The head unit must be coded to the vehicle using appropriate PSA diagnostic tools or equivalent to restore full functionality and disable security locks.
• Professional Assistance Recommended For Coding: If you do not have access to suitable diagnostic hardware or experience with PSA coding, have the coding performed by a qualified technician.

Most Common Failure Reasons

• Electrical Faults: Water ingress, corroded connectors or damaged wiring can cause intermittent operation or total failure.
• Internal Component Wear: Mechanical parts in the CD mechanism and aging electrolytic capacitors can lead to read errors or loss of audio.
• Software/Pairing Issues: Units removed from a vehicle without proper coding or units that have lost their configuration data will not operate correctly until reprogrammed.
• Physical Damage: Impact or improper removal can damage the plastic housing, connector pins or internal assemblies.

Why Choose This Unit

Purchasing an original Continental RD4-series unit with matching part numbers ensures correct fitment and preserves factory audio features. Ideal for workshops and experienced DIYers who require a direct OE replacement with authentic connectors and mounting.

To ensure seamless integration with your vehicle, this radio unit requires diagnostic pairing, which allows it to function optimally with the car’s electronic system. This step is crucial, as it synchronizes the radio with your vehicle’s ECU.

Commonly sourced from the 2012 Citroën C4 Picasso, this unit is noted for its reliability and sound quality. It serves as an essential component for drivers looking to enhance their in-car audio experience. Radio units like this often face wear and tear due to frequent usage and exposure to varying temperatures.

Technical Information

Manufacturer: Citroën/Peugeot

Model: RT3-B5-N3

Product Codes: 96766661XT, 16077577XT

Additional Numbers: N/A