In the transition toward numerical simulations for safety assessment in the automotive industry, the study presents a strategy for validating multi-component dynamic impact simulations. The proposed validation strategy follows a hierarchical decomposition approach, assessing the numerical model across four levels of modelling and physical complexity, each supported by corresponding experiments. These levels include: (1) the full-system level, where the overall response of the system is evaluated under impact loading; (2) the sub-system level, which examines interactions between multiple components within a subsection of the full system; (3) the individual component level, where the structural behaviour of single parts is analysed; and (4) the material level, where material properties are validated in isolation. To demonstrate this approach, an impact load case is applied to a vehicle's crash management system, a structure composed of AA5083, AA6063, and TL116 aluminium profiles. The material parameters for these profiles are derived using the TTR model proposed by Costas et al. The presented work outlines the design process for setting up experiments at each validation level and presents the corresponding experimental results.