- insert the key in the ignition and wait a minute - turn the key to the first position and wait a minute - turn the key so the dash lights come on and wait a minute - start the engine - take the windows down and up to reset the anti pinch - reset the clock (and radio on the C3). ----- 2014 Citroen C4 grand picasso Keyless system some times shows key not detected 2014 Citroen C4 grand picasso. Problem added: Dec 10, 2020 (3 years ago) Press and hold trip reset button below the LCD screen. Turn the key into position II. Countdown from 10 will appear on the display. Continue to hold the button until the display countdown reaches 0 and the service reminder indicator turns off. Release the trip reset button. Turn key into position 0. Turn key into position II to confirm that 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. On looking at costs, it seems this could be £100 + via main dealer. D49c.