Description
BLAUPUNKT RD4 CD car radio for Citroën and Peugeot vehicles. The radio must be coded to the vehicle using diagnostic equipment.
The Blaupunkt RD4 CD is a direct-fit OEM radio widely used in Stellantis Citroën and Peugeot models. Designed for professional workshops and experienced DIY mechanics, this unit delivers reliable AM/FM reception and integrated CD playback in the original factory mounting. Commonly searched under original part numbers, the unit is suitable for vehicles that used the RD4 specification and requires proper coding after installation to restore full functionality and anti-theft alignment with the vehicle.
Technical Information
- Manufacturer: Blaupunkt (OEM For Stellantis)
- Model: RD4 CD
- Product Codes: 9659138977, 9647521077
- Additional Numbers: 657932, 6579PC
- Compatible Models: Citroën C2, Citroën C3 (I), Citroën C3 Pluriel, Citroën C4, Citroën C8, Peugeot 207, Peugeot 307 (including 307 II), Peugeot 807
Installation Recommendations
Only for users with suitable experience: Before starting, disconnect the negative battery terminal to avoid short circuits and potential damage. Remove the dashboard trim panels using the appropriate trim tools to avoid breaking clips. Extract the original radio using the correct removal keys or unscrewing the mounting brackets, then carefully unplug the wiring harnesses and antenna connector. Fit the replacement RD4 unit, reconnect the antenna and all electrical connectors, secure the radio in the mounting cage, and reassemble trim panels.
After mechanical installation the unit must be coded/initialized to the vehicle with PSA-compatible diagnostic equipment so all security and comfort functions operate normally. If the set becomes locked or shows limited function after fitment, coding with a workshop-level tool is required to reactivate the unit.
How The Part Is Replaced
- Disconnect Battery Negative Terminal.
- Remove Surrounding Dashboard Trim Carefully.
- Withdraw Old Radio Using Removal Keys Or Unscrewing Brackets.
- Unplug Antenna And Wiring Harness Connectors.
- Install New Unit, Reconnect Connectors And Antenna.
- Verify Functionality (Radio, CD, Presets) And Perform Required Coding.
- Reassemble Trim And Reconnect Battery.
Most Common Failure Reasons
- Mechanical Wear Of The CD Mechanism: Frequent CD use leads to worn loading/mechanism parts or laser lens contamination, causing read errors or refusal to load discs.
- Electrical Issues: Faulty connectors, broken solder joints or intermittent power supply (blown fuses, poor grounding) cause loss of power or intermittent function.
- Moisture And Corrosion: Water ingress or humidity in the dash area can corrode contacts and internal circuits.
- Anti-Theft Locking / Coding Mismatch: Units removed from another vehicle or not properly coded may be locked or operate with reduced function until correctly coded to the car.
- Age-Related Component Degradation: Capacitors, switches and display elements can fail after many years in service.
Practical Tips For Workshops And DIYers
- Check Fuses And Connector Condition Before Replacing The Unit—many issues Are Caused By Wiring Or Fuses.
- Keep The Unit Dry And Protect Connectors With Dielectric Grease If Corrosion Is A Concern.
- Label Connectors During Disassembly To Ensure Correct Reassembly.
- Have Access To A PSA-Compatible Diagnostic Tool For Coding/Initialization When Required.
Keywords For Search: BLAUPUNKT RD4 CD, Citroën Radio, Peugeot Radio, 9647521077, 9659138977, RD4 CD Head Unit.
