Citroen C4 headlights and registration plate lights not working

Check the bulbs , check the fuses

Citroen C4 (2010 – present) – fuse box diagram
Year of production: 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023

The instrument panel fuse panel
Citroen C4 - fuse box diagram - instrument panel
Citroen C4 – fuse box diagram – instrument panel
Citroen C4 - fuse box diagram - instrument panel
Citroen C4 – fuse box diagram – instrument panel
No.
A
Description
R1 – Not used
R2 – 12 V socket in boot
F3 20 Parking lamps, trailer hazard warning lamps
F4 20 Interior lighting, trailer interface
F5 30 Front one-touch electric windows
F6 30 Rear one-touch electric windows
F11 20 12 V trailer socket
F12 30 Panoramic sunroof blind
F13 30 Hi-Fi amplifier
F22 20 Trailer signalling
F8 3 Alarm siren, alarm ECU
F13 10 Cigar lighter
F14 10 12V socket in boot
F16 3 Lighting for the large multifunctional storage unit, rear map reading lamps, glove box illumination
F17 3 Sun visor illumination, front map reading lamps
F28 15 Audio system, radio (after-market)
F30 20 Rear wiper
F32 10 Hi-Fi amplifier
F36 15 Rear 12 V socket
F37 – Not used
F38 – Not used
F39 – Not used
F40 – Not used
Engine compartment fuse box
Citroen C4 - fuse box diagram - engine compartment
Citroen C4 – fuse box diagram – engine compartment
No.
A
Description
F19 30 Windscreen wipers slow/fast speed
F20 15 Front and rear screenwash pump
F21 20 Headlamp wash pump
F22 15 Horn
F23 15 Right-hand main beam headlamp
F24 15 Left-hand main beam headlamp
F27 5 Left-hand dipped headlamp
F28 5 Right-hand dipped headlamp
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market..

Thanks but it’s not the bulbs and I have tried changing the fuse for the sunlight sensor, which is used for the AUTO light activation. But that hasn’t helped. I don’t know what other fuse to try, as it’s both headlights and both registration plates set of lights, which should be activated at the same time when the headlights are turned on. So it seems like an electrical fault. I have it booked into a garage in a few days.

(The fuse descriptions/locations you have provided don’t match up for my car. Mine is a C4 Picasso).

Citroen C4 Picasso mk2 (from 2013) – fuse box diagram
Year of production: 2013, 2014, 2015, 2016

Fuse box under dashboard
The type of electrical of the vehicle depends on its level of equipment. To identify the type of electrical system on your vehicle, open the bonnet.

TYPE 1: electrical system does not have any fuses in front of the battery

TYPE 2: presence of an additional fusebox in front of the battery

Type 1 fuse box
Fuse box number 1
Fuse Ampere rating [A] Function
F8 5 Steering mounted controls
F18 20 Touch screen tablet, audio and navigation system, CD player, USB ports and auxiliary sockets (AUX)
F16 15 Front 12V socket
F15 15 Boot 12V socket
F28 5 START/STOP button
F30 15 Rear wiper
F27 15 Front screenwash pump, rear screenwash pump
F26 15 Horn
F20 5 Airbags
F21 5 Instrument panel
F19 5 Rain and shunshine sensor
F12 5 Keyless starting unit
F2 5 Manual headlamp adjustment control
Fuse box number 2
Fuse Ampere rating [A] Function
F9 15 Rear 12V socket


Type 2 fuse box
Fuse Ampere rating [A] Function
F3 3 START/STOP button
F6A 15 Touch screen tablet, audio and navigation system, CD player, USB ports and auxiliary sockets (AUX)
F8 5 Alarm
F9 3 Steering mounted controls
F19 5 Instrument panel
F24 3 Rain and sunshine sensor
F25 5 Airbags
F33 3 Memorisation of diving position
F34 5 Electric power steering
F13 10 Front 12V socket
F14 10 Boot 12V socket
F16 3 Map reading lamps in row 1 courtesy lamps
F27 5 Electronic gearbox gear selector
F30 20 Rear wiper
F38 3 Manual headlamp adjustmet control
Fuse box in engine compartment
Type 1 fuse box
Fuse Ampere rating [A] Function
F18 10 Right hand main beam
F19 10 Left hand main beam
Type 2 fuse box
Fusebox 1
The fusebox is place in the engine compartment near the battery (left-hand side).

Fuse Ampere rating [A] Function
F9 30 Motorised tailgate
F19 25 HIFI amlifier
F21 3 Hands-free starting reading unit
Fusebox 2
An additional fusebox is fitted in ftont of the battery (fot type 2).

Fuse Ampere rating [A] Function
F19 30 Front wiper slow/fast speed
F20 15 Front and rear screenwash pump
F21 20 Headlamp wash pump

Thanks again. I have all the fuse details, I googled it and got a photo and all the positions. Any idea which one would control the headlights and registration plate lights at the same time? I can’t find one. That’s why I tried replacing the sunshine sensor as it does that, but they are also suppose to come on when using the switch on the steering toggle (don’t know what the stick is called).