Description
BLAUPUNKT RD4 B5 N1 CD car radio for Citroën and Peugeot vehicles. The radio must be coded to the vehicle using diagnostic equipment.
Product Overview
Reliable Blaupunkt RD4 B5 N1 CD head unit designed for a range of PSA cars. This original-style radio offers AM/FM reception with RDS and an integrated single-disc CD player, matching the factory look and controls of compatible Citroën and Peugeot models. Ideal for mechanics and DIY enthusiasts looking to replace a faulty factory radio while keeping vehicle functions such as steering wheel controls and dash integration intact.
Technical Information
- Manufacturer: Blaupunkt
- Model: RD4 B5 N1 (CD Radio)
- Product Codes: 9647521077, 9659138977
- Other Numbers: 657932, 6579PC
- Compatible Models: Citroën C2, Citroën C3 (including C3 Pluriel), Citroën C4; Peugeot 207, Peugeot 307 II, Peugeot 807, Peugeot C8
Installation Recommendations
- Always disconnect the vehicle battery before starting removal or installation to avoid short circuits and damage to vehicle electronics.
- Use the correct radio removal keys or tools to avoid breaking trim and retain all fastening clips and screws for reassembly.
- Mark or photograph connector positions before unplugging to ensure correct reconnection of antenna, power, speaker and control connectors.
- After mechanical installation, perform the required diagnostic coding to register the radio to the vehicle using PSA diagnostic tools (e.g., DiagBox/Lexia/PP2000) so that all integrated functions operate correctly.
- Verify antenna connection and radio reception, operation of the CD mechanism, and steering wheel control functions after coding.
How The Part Is Replaced
- Remove the trim surrounding the radio using appropriate trim tools.
- Extract the old radio using radio removal keys and unscrew mounting brackets if present.
- Disconnect the antenna and all electrical connectors from the rear of the unit.
- Install the replacement unit, reconnect all connectors and antenna, and secure mounting brackets.
- Reconnect the battery and perform diagnostic coding/registration of the radio to the vehicle.
- Test all functions—radio reception, CD play, RDS, steering wheel controls and sound output—before reassembling the trim.
Most Common Causes Of Failure
Failure of RD4 units is usually caused by age and mechanical wear of the CD mechanism (laser failure or tray jams), accumulation of dust or debris, moisture ingress leading to corrosion on connectors or internal circuit boards, and voltage surges affecting internal electronics. Faulty or loose antenna/plug connections can also cause poor reception or intermittent operation. Regular use over many years increases the likelihood of mechanical faults in the CD drive.
Search And Identification
Customers commonly search by product code. Use reference numbers 9647521077, 9659138977, 657932 or 6579PC when looking up compatibility and listings for this Blaupunkt RD4 unit.
