Citroen C4 2006 - Reprogramming Citroen C4 remote key. The battery was flat in the remote control key to car. A friend took the battery out and told me to get it replaced.    Now on enquiring from Halfords, apparently unless the battery is replaced with new one within 10 minuites, all the programme data is wiped off and key will need reprogramming. However it now works but it only works when you press the left hand side of the handle where as - before it went in it worked both on the left and right side of the boot handle, kinda like a see saw effect. Thinking of getting it swapped on its next service, though I am told it is a citroen only part and valued at £19.99 to buy. To manually unlock the boot in the event of a battery or central locking failure. Unlocking. Fold the rear seats to gain access to the lock from inside the boot. Insert a small screwdriver into hole A of the lock to unlock the boot. Move the latch to the left. Locking after closing I've got a stuck tailgate on my C4GP Exclusive and have had a good look around the forum and suspect the problem is the microswitch behind the lock handle. When I open the top half of the boot I can hear the microswitch operating, but when I press the plastic handle for the main boot, there is no click. Some observations on the operation of the Grand C4 Picasso 'ECO' function. I have had my 1.6 HDi e-115 Manual Exclusive+ model for two years now and have found that the operation of the 'ECO' STAR/STOP function seems to be very dependent (directly or indirectly) on outside (ambient) air temperature. Many people have reported on Citroen forums that the fuel door won't always open when the interior button is pressed. here's a very simple workaround. Citroen C4 Grand Picasso 2007 1.8i having trouble with the fuel lid/cover.This might help you as well. Car won't start New battery fitted 3 days ago, car now won't start, doesn't crank at all, car was struggling to start and was clunk noise when it eventually did, when running is smooth with no other issue's. 2013 Citroen C4 1.6 hdi Picasso Posted: Jan 3, 2024 Joined: Tue Sep 15, 2015 6:38 pm. x 4992. Re: DS3 Boot open fault. by GiveMeABreak » Wed May 12, 2021 7:36 pm. It’s not the mechanical part, but the electronic lock. Where you open the tailgate, there is usually a soft rubber membrane that you press to unlock the tailgate. The mechanisms between a power window and a manual window are different, however, if the window of your Citroen Grand C4 Picasso is stuck in the open or closed position , it will not replace much on the technical side, but in the open position it is necessarily more irritating, you risk to have your vehicle stolen, or to go through bad weather and that the inside of your Citroen Grand C4 ls8FCb.