2004 stereo upgrade need +12v and GND wires identified

Audio, ICE, Speakers, Head Unit, CD, CD Multi changer. If you have a question about any Citroen C3 related Audio, then this is the place.

Please indicate if there is a Citroen CD multi-changer, drawer or cubby under the CD/Radio, if there is the Navigation unit, CD or Radio options.
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My Name: Brane

Posts: 1
Joined: Mon Aug 22, 2022 8:33 pm
Model: C3 2002-2005, Original shape model
Year: 2004 (54)
Engine Size: 1.4
Fuel Type: Petrol
Mileage: 80000
Gearbox: Manual 5 speed
DPF: Yes
LHD or RHD: LHD (Europe)
Engine name: TU5 16-valve (110 PS)


Hello i have problem i fitting new radio in my C2 and i don't have adapter for new radio and idk which wires are for + , ground ...
Can someone tell me which wires are for ground, +12V, ...
I have :
Thin green wire
Thin red wire
Green/Yellow wire
Green wire
Brown wire
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My Name: Arfur Dent

Posts: 3521
Joined: Sat Jul 23, 2011 3:47 pm
Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
Engine name: DV4 16-valve diesel (90 PS)
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Green and yellow is typically the earth line. You can prove this with a mutlimeter set to ohms and read between the green+yellow and a car body earth point.

and the 12v supplies (computer controlled 12v) are usually on the yellow wires. You can prove this with the multimeter set to 20v range and look for 12v between a yellow and the earth. One 12v will come on with the ignition and the other will be live without the ignition (but it all depends on the computer).

Its much easier to get the patch lead if you don't know where the wires should go. The lead for the 2004 C3 is very cheap and makes the job very easy.
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