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.
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.
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.
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citroen c4 picasso central locking problems
