TECHNICAL SERVICE BULLETIN: CUSTOMER SATISFACTION: ANTI-THEFT S/W LOGIC UPGRADE & DECAL INSTALLATION (CS2301) - This bulletin provides the procedure to upgrade the software logic of the Integrated Body Control Unit (IBU) or Body Control Module (BCM) system on some 2021-2022MY K5 vehicles produced from March 27, 2020 through December 21, 2021, which may not be equipped with and immobilizer. This logic upgrade will add anti-theft ignition start logic to the vehicle's system operation.
