This genuine replacement rear left lamp is suitable for Citroën C4 Grand Picasso models and is identified by the product code 6350AC. Designed to restore full rear lighting functionality and road visibility, this assembly is an ideal choice for professional workshops and DIY mechanics who require a reliable, direct-fit part. Clear lens optics and precise mounting points ensure correct alignment and light distribution after installation.

Technical Information

• Manufacturer: Stellantis (Citroën)
• Model: Citroën C4 Grand Picasso; Citroën C4 Picasso
• Product Codes: 6350AC
• Other Numbers: No additional OEM numbers provided
• Condition: Used part

Compatibility And Fitment

Fits the rear left side (driver side on left-hand drive vehicles) of Citroën C4 Grand Picasso. Intended as a direct replacement for the original tail light assembly when the original unit is damaged, cracked or suffering electrical faults. Always verify visual match with the vehicle before installation.

Installation Recommendations

Basic replacement steps for experienced technicians or competent DIY mechanics:

• Open the tailgate and remove interior trim panels to access mounting screws and electrical connector.
• Unscrew the retaining bolts and carefully release any clips holding the lamp in place.
• Disconnect the wiring harness plug and remove the old lamp assembly.
• Compare bulb sockets and gaskets; transfer bulbs if required or replace with recommended types.
• Install the new lamp, reconnect the harness, secure bolts and re-fit trim panels. Check alignment and seal seating to avoid water ingress.

Recommended precautions: Disconnect the battery before working on vehicle electrics to avoid short circuits. Inspect and clean connectors, use dielectric grease on terminals if necessary, and tighten fasteners to the manufacturer’s recommended torque to prevent damage to mounting tabs.

Most Common Reasons For Failure

• Water Ingress: Failed seals or cracked lens allow moisture, causing corrosion or short circuits.
• Impact Damage: Rear-end collisions or knocks commonly crack the lens or break mounting tabs.
• Connector Corrosion: Oxidation of contacts leads to intermittent or complete electrical failure.
• Bulb/Socket Wear: Repeated bulb changes and heat cycles can degrade sockets or holders.
• Aging Seals and Plastics: UV exposure and temperature cycles make housings brittle and leaky over time.

Notes For Professionals

When replacing a used lamp assembly, always check the integrity of the mounting points and the condition of the wiring harness. Align the unit correctly and test all functions (tail, brake, indicator, reverse where applicable) before returning the vehicle to service.

This rear left lamp socket (bulb holder) is a practical replacement part designed for Citroën C4 Grand Picasso owners and professional workshops. The unit includes bulbs and a short section of wiring, making it ideal for quick repairs of tail light failures. Commonly searched by product code 6350AC, this part restores reliable electrical contact and simplifies lamp replacement without the need to change the entire lamp housing.

Function and Application

The socket secures the bulbs for the rear left tail light cluster and provides the electrical connections for stop, tail, and indicator bulbs (depending on vehicle configuration). It ensures correct positioning of bulbs in the lamp assembly and maintains electrical continuity between the wiring loom and the lamp. Supplied wiring helps replace damaged harness sections and eases reconnection when original connectors are corroded or broken.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 Grand Picasso
• Product Codes: 6350AC
• Additional Numbers: No additional reference numbers provided

Fitment and Compatibility

Fits Citroën C4 Grand Picasso models that use the rear left lamp assembly compatible with product code 6350AC. This part is suitable for mechanics and DIY enthusiasts searching by the part number 6350AC or by the vehicle model name.

Installation Recommendations

• Before starting the job, disconnect the negative battery terminal when performing electrical work to avoid short circuits.
• Remove the tail light cluster following the vehicle manufacturer’s access procedure to reach the bulb holder.
• Unplug the original socket from the wiring loom, remove any retained bulbs and clips, and install the new socket into the lamp housing until it locks securely.
• If the supplied wiring replaces a damaged section, make solid crimps or solder joints, protect connections with heat-shrink tubing, and secure the harness to avoid chafing.
• Use a small amount of dielectric grease on contacts to reduce future corrosion and ensure good electrical contact.
• After installation, verify all lamp functions (tail, stop, indicator, and reverse if applicable) before refitting trim panels.

Why This Part Commonly Fails

Bulb holders frequently fail due to moisture ingress and corrosion of electrical contacts, heat cycling from bulbs that causes plastic deformation, mechanical wear from vibration, and damage from impact or improper removal. Poor grounding or loose connections can also cause intermittent lamp operation. Replacing the socket and renewing a short section of wiring is a common, cost-effective repair to restore reliable lamp function.

Notes For Professionals And DIYers

Part code 6350AC is often used when sourcing replacement rear lamp components for the Citroën C4 Grand Picasso. Keep the original lamp housing and inspect seals and gaskets during replacement—repairing or renewing seals will help prevent repeat failures. This product is intended for direct replacement; check lamp operation and alignment after fitting.