>>A<< Wireless Control Module (WCM) - Vehicles With WCM/Receiver Antenna Module - Vehicles With Kos - Installation
WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
Check that the top claw of receiver antenna module is fixed securely to the boss of steering lock and the antenna is not floated on the key cylinder.