As vehicle security systems continue to evolve, two terms are becoming increasingly important for independent workshops and technicians: SERMI and Security Gateways (SGW). While both relate to vehicle security and diagnostic access, they serve very different purposes within the repair process. Understanding how they differ helps workshops stay compliant and maintain full diagnostic capability.
A Security Gateway (SGW) is a security feature built directly into many modern vehicles. It acts as a control point between the vehicle’s internal networks and the diagnostic tool connected through the OBD port. Manufacturers introduced SGWs to prevent unauthorised access to critical vehicle systems such as braking, steering, driver assistance systems and immobilisers.
Without SGW authentication, diagnostic tools may only be able to read basic vehicle data. Important functions such as clearing fault codes, performing special functions or carrying out calibrations can be restricted. To regain full diagnostic functionality, the tool must authenticate with the manufacturer through an approved SGW access process. Many professional diagnostic platforms now support SGW unlocking so technicians can continue carrying out repairs in the workshop.
SERMI works at a completely different level. SERMI stands for the Security Related Repair and Maintenance Information scheme and is a European wide accreditation system. Instead of controlling communication with the vehicle itself, SERMI controls who is authorised to access manufacturers’ secure online portals that contain sensitive anti theft information.
These portals provide security related repair data such as immobiliser coding procedures, key programming information and anti theft system configuration details. Because this information could be misused, technicians and workshops must go through an official approval process before access is granted. This includes identity verification and business checks to ensure that only legitimate automotive professionals can obtain this data.
In simple terms, SGW protects the vehicle during a physical diagnostic session in the workshop, while SERMI controls access to high level security information provided by manufacturers.
For modern workshops, both systems are essential. SGW access keeps everyday diagnostics running smoothly, while SERMI certification enables technicians to perform advanced security related repairs such as key programming and immobiliser work. Together they represent the future of secure vehicle diagnostics in the automotive industry.
If you want help understanding what is right for your workshop or have any questions, the team at LAUNCH UK & IRL is here to help, just call us on 01752 968343 or at sales@launchtech.co.uk. Our support team is happy to help with any questions you need answering!
