All the wires to the tailgate go through the rubber tube so possibly a few of them have broken or maybe just the earth wire. This is from the C4 Technical section Common Problems pinned topic and it may be worth contacting your Citroen dealer in case they may do the repair free of charge: 13. Tailgate electrical faults - rear wiper, lock.
7. Defective key fob. If your C4 key fob stopped working after you dropped it on the floor, you may have damaged the internal chip. Or, if your key fob just stopped working one day out of the blue, in rare cases this could indicate a faulty key fob – assuming you have tried everything to fix the issue e.g. battery replacement, reprogramming and the spare key fob works.
Just bought a C4 Picasso 11 plate. Got it home and used the fob to central lock the car. Just happend to try the drivers door to check it was locked and it wasnt. In fact opening the door unlocked all the doors. It will lock them all with the key inserted.
See more Citroen C4 Problems Picasso Blue HDI 1.6 Engine not starting, touch screen not coming on 1.6 Engine fault light on then it's downhill from there..!!
The central locking works manualy with no problems, but i wanted to get it to work remotely. I brought a new battery for the key fob and still the central locking did not work. I  decided to follow some advice id seen while browsing the internet.
Matija83. Wed Apr 08 2020, 09:50am. Member No: #43153. Joined: Jan 02 2016. Location: Gospic. I have an C4, 2012, 1.6 VTI 120HP. I have a problem while driving, car says front left door opened, and the door is closed. it happens especially in corners. So, I assume faulty door closed sensor. Where is the sensor location, or what is the problem.
2.1-Operation of the central locking system on Citroen Grand C4 Picasso. The purpose of central locking is to synchronize the closing of the doors and boot with a single action. This is very practical to ensure that your vehicle is closed, especially from a distance. However like any technology it could have problems. 2.2-Possible repairs of a
Central locking not working off key fob 2004 Citroen Xsara Picasso lx 1.6. Problem added: Dec 4, 2010 (13 years ago) More Problems with the 2004 Citroen Xsara Picasso
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Turn ignition on and off quickly 4 times, remove key from ignition, you will then hear tone, point ignition key towards interior light and operate the central locking. This will reset it.
Had same symptoms of a slipping clutch drove into workshop but would slip under pressure 1.1-test the opening of the doors of the skoda fabia with the key. First try the central locking. To do this press the key of your car. Observe if the malfunction is general. That is, do you have a single door stuck or several. If this is verified then there is a good chance that the dysfunction comes from the centralization. Paired keys so that central locking all works but when I leave the car for more than 5 mins the central unlocking then won't work have to use key. Also every time this happens I have to reset the dash multifunction screen time and date, then after the central unlocking doesn't work the dashboard has to be set again. Connect your Citroen C4 Picasso to a running car to transfer energy and recharge your vehicle’s battery. This will at least give you enough power to close the doors of your car. If you have any uncertainties about your battery’s ability to keep the charge. Make sure you close the doors of your car while it is still connected to the other car.
If the car starts you might just have a low remote battery (should come up in the central display though) but if it's completely dead you might need the key recoding. If it's just the remote function not working then it's probably like my key, having been dropped there's something bust in the circuit so it only works as a traditional key; not
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    • citroen c4 picasso central locking problems