The screen does not go pass the splash screen. Sometimes I can hear music playing, the buttons light up, but cannot select anything. Cannot find how to do a manual reboot/reset. Hello all, I've just bought my first Citroen, the C4 1.6 HDi 16v Coupe (92) and I'm really impressed. The only problem I have is that the LCD screen that displays the radio information etc is not working correctly - nothing is readable and most times it only shows about 3 or 4 "pixels" although it is still back-lit!! The air con in my 07 GP has stopped working. Don't think it needs a re gas because when you switch it on there is no clicking noise. Just wondering if it could be a fuse or switch and hopefully not the compressor. The car came out warranty at the start of Feb but Citroen not willing to help. Any body got and ideas To resolve this issue, just go to the settings of your GPS and change the date manually. GPS Citroen C4 mapping problems: In this situation, if your GPS gives you bad information, you will have to update the GPS of your Citroen C4, don’t think twice to seek advice from our article on this subject matter to find out the procedure to stick to. The replacement screen in my car has remained working 100% through cold weather and plenty of use. Everytime I unlock the car I do still hold my breathe for a moment and check the screen illuminates correctly! I know Citroen were trying to find another solution (rather than screen part replacement). Re: C4 Steering Wheel Controls. Part number 6239RC. It is the same as the original, Its a Valeo unit. The same buttons didn't work on the original, apart from Cruise which now works fine. Thanx to Marc and all the admins & knowledgeable people that make this the best forum on the interweb. The problem. Many Citroen C4 and C5 owners have experienced a problem with the heater blower not working properly. Owners may experience an intermittent heater blower fan, on one or more of the speed settings, or the fan may not work all, or only on full power, or may be stuck on full power. Go sit in the car and get comfy. Start the car up and plug in the USB and follow the instructions. DO NOT turn the car off, or drive while it is downloading. This is important. It could take up to 30 mins to transfer. It will reboot when ready. DO NOT leave your car alone with the engine running. This happen a few days ago, which leaves me with no access to the car boot/trunk, I had to remove the locking mechanism from the inside so I could gain acces NigelTullett Discussion starter. 268 posts · Joined 2021. #1 · Oct 2, 2021. Hi - just taken delivery of ex demo C4e, the My Citroen app is telling me there is a touch screen and nav map update to install, have been trying most of yesterday following various instructions! The instructions refer to usb, but the car also has a usb c connection XJuv9.