Description
Electric lock for the rear liftgate window for Citroën C4 Picasso and Grand C4 Picasso first generation.
Product Overview
High-quality electric lock actuator designed as a direct replacement for the rear liftgate (tailgate) window latch on Citroën C4 Picasso and Grand C4 Picasso (first generation). Fits the original mounting points and electrical connector types used by Stellantis vehicles. Commonly referenced under part numbers 9660403680, 8719A6 and 8719G8, this unit restores proper locking and central-lock integration for vehicles where the tailgate latch has failed or become unreliable.
Technical Information
- Manufacturer: Stellantis / Citroën
- Model: Citroën C4 Picasso (First Generation); Citroën Grand C4 Picasso (First Generation)
- Product Codes: 9660403680, 8719A6, 8719G8
- Additional Numbers: 8719A6 | 8719G8 | 9660403680
Function and Application
This electric lock actuator controls the mechanical latch of the rear liftgate window, allowing the central locking system to lock and unlock the liftgate electrically. It transmits the locking movement from the vehicle’s central-locking system to the latch mechanism and includes the electrical connector for power and signal. A correctly functioning unit ensures secure closure, prevents rattles and allows remote or central locking/unlocking.
Installation Instructions
Replacement can be performed by a competent DIYer or a professional mechanic. Follow these general steps:
- Disconnect the negative battery terminal before starting work to avoid short circuits or damage to vehicle electronics.
- Open the liftgate and remove interior trim panels to access the latch area (retain clips and screws in order).
- Unplug the electrical connector from the existing lock actuator and remove the fixing bolts/screws securing the unit.
- Extract the old actuator and install the new unit in the correct orientation; secure with original fasteners.
- Reconnect the electrical connector and temporarily reconnect the battery to test locking/unlocking cycles (use the central locking and key fob to confirm operation).
- When function is confirmed and no unusual noises are present, disconnect the battery again, reassemble trim panels and finally reconnect the battery.
Test the lock operation several times and check for smooth movement and correct alignment before completing reassembly.
Mounting Recommendations
- Always work with the battery disconnected until final testing is complete.
- Check the liftgate striker alignment; misalignment places extra load on the actuator and shortens service life.
- Inspect and, if necessary, replace worn or brittle rubber seals around the liftgate to reduce water ingress.
- Lightly lubricate mechanical contact points with a suitable grease recommended for exterior locks; avoid contaminating electrical connectors.
- When refitting trim, ensure all clips are properly seated to prevent rattles that can mask latch problems.
Common Failure Causes
- Water Ingress And Corrosion: Exposure to moisture causes electrical connector corrosion and internal mechanism rust.
- Mechanical Wear: Plastic gears and internal linkages can wear or break after many cycles, especially in older vehicles.
- Connector Or Wiring Damage: Broken wires, poor contacts or corroded plugs interrupt power or signals to the actuator.
- Misalignment Or Impact Damage: A damaged striker or misaligned liftgate increases stress on the latch and can cause premature failure.
Service Life And Practical Notes
The lifespan depends on vehicle usage and environmental exposure. Regular inspection of seals, connectors and striker alignment extends life and reduces the chance of sudden failure. If the lock shows intermittent operation, unusual noise or does not hold the liftgate securely closed, replacement is recommended to maintain safety and prevent water entry.
Why Choose This Part
Direct-fit replacement with common PSA part numbers ensures compatibility with original mounting and electrical connections. Ideal for mechanics and experienced DIYers who need a reliable fix for liftgate locking problems on first-generation Citroën C4 Picasso and Grand C4 Picasso models.
Additional Notes
Part numbers and fitment references listed above are provided to aid identification and searchability. Verify the part numbers printed on the existing unit if possible before ordering to ensure correct match.
