TSB - SERVICE ACTION: HEADLAMP ?WELCOME BLINK? OPERATION ? ICU LOGIC IMPROVEMENT (SA331) - This bulletin provides the procedure to improve the logic of the Integrated Central Control Unit (ICU) on some 2018MY Stinger (CK) vehicles, produced from September 21, 2017 through December 15, 2017, which in very rare circumstances may experience inoperative ?welcome blink? of the headlamps.