Abstract ISO/TS 22239-1:2009 specifies a child seat presence detection system that enables child seats placed on any passenger seats to be automatically detected where a child is at risk from an active airbag. The system provides the option of using additional information about the orientation of the child seat. ISO/TS 22239-1:2009 describes the main system functionality, and provides design recommendations and requirements, compatibility measurements and labelling requirements. Compliance with the requirements of ISO/TS 22239-1:2009 ensures compatibility between child seat presence and orientation detection system (CPOD) child seats and CPOD passenger seats. ISO/TS 22239 applies only to child restraint systems in which the child is orientated in the forward or rearward driving direction