Valeo Rear Wiper Motor for Citroën C5 I II Estate 9638335780 6405K1

Description

Rear window wiper motor for CITROËN C5 I and II estate

High-quality replacement rear wiper motor designed for Citroën C5 I and II station wagons. Ideal for professional mechanics and DIY enthusiasts, this motor restores reliable rear-screen wiping performance, eliminates intermittent or non-moving wiper arms and improves rear visibility in wet conditions. Built to fit the original mounting points and electrical connector, it is a direct-fit part for quick installation. Commonly searched by part numbers (e.g. 9638335780, 6405K1), this unit helps garages and independent technicians find the correct component fast.

Technical Information

• Manufacturer: Valeo
• Model: Citroën C5 I (Estate) / Citroën C5 II (Estate)
• Product Codes: 9638335780, 6405K1
• Other Numbers: 03 54904512, NFP

Fitment

Fits Citroën C5 First Generation (C5 I) and Second Generation (C5 II) estate/wagon body styles. Check physical match of connector and mounting points before installation when possible. This motor is intended for the rear tailgate wiper assembly.

Function

The rear wiper motor converts electrical input into rotary motion transmitted through the wiper linkage to sweep the rear glass. It provides intermittent and continuous wipe functions as controlled by the vehicle’s wiper switch. Proper motor operation is essential for clear rear vision and safe reversing in rain or snow.

Replacement Guide

Recommended steps for replacement (general guide):

1. Disconnect Battery: For safety, disconnect the negative battery terminal before starting work.
2. Remove Interior Tailgate Trim: Carefully remove the tailgate trim to access the motor and linkage. Retain all fasteners and clips.
3. Disconnect Electrical Connector: Unplug the motor connector and any grounding wires.
4. Detach Wiper Arm: If necessary, remove the external wiper arm from the splined shaft (mark shaft position before removal to preserve park position).
5. Remove Mounting Bolts: Unscrew the motor securing bolts and detach the motor from the linkage and tailgate.
6. Install New Motor: Position new motor, secure bolts to the manufacturer’s torque where available, reconnect linkage, and reattach electrical connector.
7. Reassemble And Test: Refit trim and wiper arm, reconnect battery, then test all rear wiper functions (intermittent and continuous) and park position.

Mounting Recommendation

Use correct fastener torque and ensure the motor splines and wiper arm are aligned to the original park position. Replace any damaged trim clips to avoid vibration noise. Apply a light dielectric grease to the electrical connector contacts if corrosion is present. If the linkage shows excessive play or rust, replace or refurbish the linkage at the same time to ensure smooth operation and avoid overloading the new motor.

Why This Part Most Commonly Fails

Typical failure causes include water ingress and corrosion of the gearbox or motor housing, worn brushes and commutator inside the motor, seized gearbox due to dirt or rust, stripped splines on the output shaft, and electrical connector faults. Excessive load from a frozen or obstructed wiper arm accelerates wear. Environmental exposure (road salt, moisture) significantly shortens service life.

Notes For Professionals

Part numbers are commonly used by workshops to identify the correct replacement quickly. When performing the replacement in a professional environment, verify connector type and mounting orientation before final assembly. After installation, confirm proper park position and wipe pattern to ensure correct operation.