Description

This high-mounted stop lamp (third brake light) is a direct-fit replacement for first-generation Citroën C4 Picasso and Grand Picasso models. It restores the centre high-mounted brake signal for improved visibility and road safety. The part is frequently searched by reference numbers 9654435580 and 968834980 and internal codes 6351Z7 / 6351HT.

Features

• Direct replacement for the original centre high-mounted stop lamp (CHMSL).
• OEM-compatible fit and connector layout for easy installation.
• Durable housing and lens designed for tailgate mounting.
• Includes electrical connector interface compatible with factory wiring harness.

Fitment

Intended for: Citroën C4 Picasso (first series) and Citroën Grand Picasso (first series). Common OE/Product references: 9654435580, 968834980. Internal/Additional codes: 6351Z7, 6351HT. Always verify the shape and connector visually before installation to ensure fitment.

Installation

Typical replacement procedure for a centre high-mounted stop lamp on the tailgate:

• Open the rear tailgate and remove the interior trim panel to access the lamp mounting area.
• Unscrew the retaining fasteners and gently release the lamp assembly from the tailgate.
• Disconnect the electrical connector and remove the old unit.
• Install the new lamp, reconnect the electrical connector and secure all fasteners. Ensure the lamp sits flush and sealing surfaces are intact.
• Refit the interior trim and test the brake light operation with the vehicle ignition on and brake pedal applied.

Estimated replacement time: approximately 20–60 minutes depending on experience and available tools. Always disconnect the battery or ensure the ignition is off when handling electrical connectors to avoid short circuits.

Common Failure Reasons

• Water ingress or damaged seals causing corrosion of contacts or LED/module failure.
• Connector corrosion or bent pins leading to intermittent or total loss of function.
• Impact damage or cracked lens from rear collisions or loading in the boot area.
• Aging of internal electronics (for LED modules) or filament burnout (if applicable).
• Wiring damage in the tailgate harness due to repeated opening/closing or pinch points.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 Picasso (First Series), Citroën Grand Picasso (First Series)
• Product Codes: 9654435580, 968834980
• Other Numbers: 6351Z7, 6351HT

Installation Recommendations

• Use correct hand tools and avoid overtightening plastic fasteners to prevent cracking the housing or trim.
• Inspect and, if necessary, replace any worn seals or gaskets to maintain proper waterproofing.
• Clean connector pins and apply a thin film of dielectric grease to protect against corrosion and ensure reliable contact.
• Check tailgate harness routing for chafing or damage and repair any compromised wiring before final assembly.
• After installation, verify proper operation of the lamp from both driver position and from the rear of the vehicle.

Why This Part Pays Off

Replacing a faulty centre high-mounted brake lamp restores a critical passive safety function and avoids fines for non-working brake lights. Searching by OE numbers 9654435580 or 968834980 and codes 6351Z7 / 6351HT helps you find the correct unit quickly. Designed for straightforward installation by professionals and experienced DIYers, this unit returns the vehicle to full signaling compliance.