Description
Electronic parking brake controller for Citroën C4 Picasso up to 2013, DS4 and Peugeot 3008, 5008. Used part, shows signs of use, is fully functional.
This electronic parking brake controller (handbrake switch/actuator control) is a direct-fit replacement commonly used on Stellantis vehicles from Citroën and Peugeot. Designed for workshops and experienced DIYers, the unit restores proper activation and status signalling of the electric parking brake system. The listing is optimised for searches by part number (9666405677) and model names to help mechanics and owners find the correct spare fast.
Function and Typical Symptoms
The unit monitors and commands the electric parking brake: it communicates parking-brake requests to the brake actuator, provides status to the vehicle network and drives dashboard warning lamps. Common symptoms of a faulty controller include intermittent or permanent parking brake fault warnings, inability to engage or release the electric parking brake, warning lights on the instrument cluster and loss of proper handbrake feedback.
Technical Information
- Manufacturer: Stellantis / Citroën / Peugeot
- Model: Citroën C4 Picasso (up to 2013), DS4, Peugeot 3008 I, Peugeot 5008 I
- Product Codes: 9666405677
- Additional Numbers: 470706, 470703
Installation Recommendations
- Always work in a safe environment and follow vehicle manufacturer procedures.
- Before starting, disconnect the negative battery terminal to avoid short circuits and unintended airbag or network activity.
- Access is typically through the centre console or dashboard area depending on model: remove trim panels and the handbrake surround to reach the switch assembly.
- Unplug the electrical connector and release any retaining clips or screws. Replace the unit and reconnect the connector securely.
- After fitting, reassemble trim and reconnect the battery. Verify that the parking brake engages and releases correctly and that no fault lights remain on the instrument cluster.
- Some vehicles require system initialization or adaptation after replacement. If a warning remains or the system does not operate correctly, a diagnostic tool capable of PSA functions (e.g. DiagBox/Lexia) may be required to clear faults and perform adaptation.
Why The Part Fails Most Often
- Wear And Mechanical Fatigue: Repeated use can wear internal contacts and mechanical components within the switch or controller.
- Moisture And Corrosion: Water ingress around the centre console or wiring can cause corrosion of connectors and internal electronics.
- Electrical Issues: Loose connectors, damaged wiring or short circuits in the vehicle network can damage the unit or cause intermittent faults.
- Contamination: Debris, dust or spilled liquids in the console area can obstruct moving parts or degrade electrical contacts.
This unit is supplied used and shows signs of previous installation. It is intended for experienced installers and professional workshops familiar with electric parking brake systems. Including the part number in searches increases the chance of finding the correct replacement quickly.
