The remote control does not lock or unlock the doors.

Symptoms

["If the remote control battery is flat, use the emergency key.", "If other appliances are causing interference, stop using them or use the key.", "If vehicle is in a high electromagnetic radiation zone or has a discharged battery, replace the battery or use the key.", "If the vehicle is started, the key's locking/unlocking is blocked. Turn off the ignition.", "If desynchronised, unlock the driver's door with the key, then start the engine to synchronise."]