As advanced driver assistance systems (ADAS) become increasingly integrated into everyday driving, their safe and intended use depends not only on user knowledge but also on motivation and engagement. To address this challenge, this study explores persuasive onboarding approaches - varying in media (app-based vs. in-vehicle) and navigation strategy (linear vs. exploratory) - and their effects on usability, user experience (UX), acceptance, and understanding of ADAS. In a controlled 2 \(\times \) 2 between-subjects study (N = 40), four tutorial variants were compared using pre- and post-measures of user perceptions and knowledge. App-based onboarding resulted in higher usability and UX compared to in-vehicle onboarding. Navigation strategy revealed no significant effects, although descriptive trends suggested that linear navigation may support efficiency and clarity, while exploratory navigation may offer advantages for users with lower prior knowledge. Overall, all tutorial formats improved ADAS-related understanding. These findings highlight that onboarding should not only inform but also persuade by fostering autonomy, competence, and confidence as foundations for safe and responsible system use.