Description
Rear Wiper Motor For Citroën C4 And C4 Grand Picasso
High-quality replacement rear wiper motor designed for Citroën C4 and C4 Grand Picasso models. This motor (listed under part numbers 0390201807, 9646803180, 6405S2) restores reliable rear-window wiping performance, eliminates intermittent operation and noisy or stuck wiper arms. Built to match the original fitment and electrical connections, it is suitable for professional workshops and experienced DIY mechanics looking for a direct swap with OEM-style mounting and plug-in connectors.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C4; Citroën C4 Grand Picasso
- Product Codes: 0390201807, 9646803180, 6405S2
- Additional Numbers: 6405S2
Compatibility
Intended for rear wiper systems on Citroën C4 and Citroën C4 Grand Picasso models. Always check the vehicle’s part number list or the original motor to confirm matching connectors and mounting before installation.
Function And Typical Failure Modes
The rear wiper motor converts electrical input into rotational motion to drive the wiper arm across the rear window and park it in the correct rest position. Common failure causes include brush and commutator wear, water ingress and corrosion of internal components, seized or worn gear train, degraded bearings, and electrical connector faults. Failures typically appear after many years of exposure to weather and mechanical load, and are more frequent in vehicles used in salty or wet environments or where the wiper arm has been loaded against a frozen or stuck blade.
Installation Recommendations
- Switch off ignition and remove the wiper arm (release retaining nut and carefully pull the arm off the splined shaft).
- Remove the tailgate trim panel or access cover to expose the motor and linkage; retain fasteners and clips for reassembly.
- Note or mark the park position of the wiper arm and the orientation of the linkage before removal to ensure correct reinstallation.
- Disconnect electrical connector and remove motor mounting bolts. Inspect linkage for excessive play or wear — replace if necessary.
- Fit the new motor, align to the marked park position, torque fasteners to manufacturer specification, reconnect the plug and temporarily reconnect battery or ignition to test full sweep and park function before reassembling trim.
- Apply dielectric grease to the connector contacts and ensure tailgate seals are correctly seated to reduce risk of future water ingress.
- Reinstall the wiper arm, check alignment, and confirm the wiper parks correctly over several cycles.
Why Rear Wiper Motors Fail
Failure is most often caused by mechanical wear of internal brushes and bearings, water penetration leading to corrosion, or overload when the blade is frozen or obstructed. Electrical issues such as poor connector contacts or intermittent wiring can also cause erratic operation. Replacing both the motor and any worn linkage or seals will help ensure long-term reliability.
Notes For Professionals And DIYers
This motor is supplied to match common OEM part numbers 0390201807 / 9646803180 / 6405S2. It is aimed at mechanics and skilled DIY enthusiasts who require an easy-fit replacement that restores original performance. Always verify fitment visually against the original unit and follow vehicle manufacturer procedures during disassembly and reassembly.
Order this reliable rear wiper motor to eliminate intermittent wiping, noisy operation or complete loss of rear wiper function and get the rear screen clearing correctly again.
