Description
Left front wiper motor for Citroën C4 Picasso and C4 Grand Picasso. Driver’s side. Up to 2013.
This high-quality replacement left front wiper motor is designed for Citroën C4 Picasso and C4 Grand Picasso models produced up to 2013. Ideal for professional workshops and DIY mechanics who search by part number (9687621780, 6405NH), this motor restores reliable windshield wiping performance and eliminates intermittent operation, noisy movement, or complete loss of function. Compatible with original wiper linkages, it provides direct-fit installation and improved serviceability compared with worn or seized units.
Technical Information
- Manufacturer: Stellantis (Citroën/Peugeot)
- Model(s): Citroën C4 Picasso, Citroën C4 Grand Picasso — Driver’s Side — Up To 2013
- Product Codes: 9687621780, 6405NH
- Additional Numbers: 6405KT, 6405PH
Function And Application
The wiper motor drives the left front wiper arm through the wiper linkage, converting electrical input into the oscillating motion required to clear the windshield. It includes an internal reduction gear and park-position mechanism to ensure the blade returns to its resting position when switched off. Proper function is essential for visibility and safety in wet or dirty conditions.
Common Faults And Causes
Typical symptoms indicating motor failure include slow or erratic wiper movement, scraping or grinding noises, intermittent operation, or complete immobility of the left wiper. The most frequent causes are water ingress and corrosion of internal components, worn brushes or commutator, mechanical wear in the gearbox, and seized or worn linkage joints. Electrical issues such as poor connector contacts or blown fuses can mimic motor faults and should be checked during diagnosis.
Replacement Guide
Basic replacement steps for experienced technicians or competent DIYers:
- Park the vehicle with the ignition off and ensure the wipers are in the park position.
- Disconnect the negative battery terminal before starting work to prevent short circuits and accidental motor activation.
- Remove the wiper arm from the splined shaft (retain nuts and caps) and carefully lift off the arm.
- Remove any cowl or trim panels securing access to the wiper motor and linkage.
- Disconnect the electrical connector from the motor and undo the mounting bolts securing the motor to the body or linkage.
- Withdraw the motor assembly. If the motor and linkage are separate, transfer any small parts or bushes to the new motor if required.
- Fit the replacement motor, secure mounting bolts to the manufacturer recommended torque, reconnect the electrical connector and reassemble trim panels.
- Reconnect the battery, then test the wiper function. Verify correct park position and smooth motion through all speeds and intermittent settings. Adjust arm position on the splined shaft if necessary.
Installation Recommendations
- Always Disconnect The Battery Before Removal Or Installation And Follow Manufacturer Procedures To Avoid Damage.
- Inspect The Wiper Linkage, Bushes, And Arm Splines For Wear Or Play; Replace Worn Parts To Avoid Premature Motor Load And Failure.
- Ensure Electrical Connectors Are Clean And Secure. Corroded Contacts Can Cause Intermittent Operation.
- When Refitting Wiper Arms, Confirm Correct Park Position And Tighten Fasteners To Specified Torque To Prevent Slippage.
- Apply A Small Amount Of Suitable Grease To Linkage Joints During Reassembly To Reduce Wear And Noise.
Why This Part Fails Most Often
Left front wiper motors commonly fail due to long-term exposure to moisture and road contaminants that penetrate seals, causing corrosion and electrical faults. Mechanical overload from seized linkages or worn joints increases motor torque and accelerates gear and brush wear. Lack of lubrication and salt exposure in winter climates further shortens service life.
