Description
Third brake light for Citroën C3 first generation. With socket – bulb functionality not guaranteed.
This high‑mount stop lamp (third brake light) is a direct replacement unit intended for the Citroën C3 (first generation). It improves rear visibility under braking and completes the vehicle’s lighting system to meet road safety requirements. The unit is supplied with the lamp socket fitted; the condition or functionality of the bulb is not guaranteed.
Technical Information
- Manufacturer: Stellantis (Citroën / Peugeot)
- Model: Citroën C3 (First Generation)
- Product Codes: 9638523480, 6351Q2
- Other Numbers: —
Function And Symptoms
The third brake light is the centrally mounted high‑level stop lamp that provides an additional visual signal when the brakes are applied. Common symptoms indicating a faulty unit include no illumination at the centre high‑mount position during braking, intermittent operation, or water condensation visible inside the lens. Failure reduces visibility to following drivers and compromises safety.
Typical Causes Of Failure
Most failures are caused by one or more of the following: bulb burnout (if fitted with an incandescent bulb), corrosion of the socket contacts, wiring connector corrosion or damage, water ingress through degraded seals, mechanical damage to the lens or housing from impacts, or vibration‑induced joint fatigue.
Replacement Procedure (Overview)
Replacement is straightforward for an experienced mechanic or competent DIYer. General steps:
- Open the tailgate/hatch and remove the interior trim panel to access the lamp mounting area.
- Unscrew or unclip the retaining fasteners securing the lamp assembly.
- Carefully disconnect the wiring harness from the socket; inspect the connector for corrosion or damage.
- Remove the old lamp assembly, fit the new unit into the mounting position and secure with the original fasteners.
- Reconnect the wiring harness, test brake light function (have an assistant press the brake pedal or use a brake light tester), then reassemble the trim panel.
Installation Recommendations
- Work on a switched‑off vehicle; for extra safety isolate the negative battery terminal if you will be working close to vehicle electrics.
- Inspect the wiring harness and connector for corrosion; if present, clean contacts or replace the connector to ensure reliable contact.
- Check the sealing surface and replace any damaged gaskets to prevent future water ingress.
- When fitting a unit supplied without a guaranteed bulb, install a new appropriate bulb or LED insert compatible with the vehicle’s electrical system.
- After installation, verify correct operation of brake lights from inside and outside the vehicle and confirm there are no warning lights on the dash.
Why This Part Usually Fails
The third brake light is exposed to vibration, weather and temperature cycles. Over time, seal deterioration allows moisture to enter, causing socket corrosion and electrical failures. Mechanical impacts or aging of plastic components can also crack the lens or housing. Bulb burnout is common when incandescent bulbs are used; connector wear and wiring fatigue lead to intermittent faults.
If you are a professional mechanic or a skilled DIYer looking for a reliable replacement for a Citroën C3 first generation, this unit (9638523480 / 6351Q2) is a practical choice to restore proper brake‑light function and vehicle safety.
