The Special Interest Group on Component & Separate Technical Units (SIG-C&STU) proposes amendments to UN R159, UN R158, UN R151, and UN R166 to add Component and Separate Technical Unit approvals. For UN R159, the proposal introduces a universal functional block structure separating Detection, Control, and Human Machine Interface functions, with Component or Separate Technical Unit fulfilling Detection and Control as minimum requirements. The regulation is restructured into three parts: vehicles without approved Component or Separate Technical Unit, vehicles with approved Component or Separate Technical Unit, and Component or Separate Technical Unit specifications. UN R158 adds new devices for Rear-View Camera Systems and Detection Systems to Part I, with corresponding installation requirements in Part II. The group requests written comments within four weeks and plans submission to Working Party 29 in June 2026.
The Special Interest Group on Component & Separate Technical Unit (SIG-C&STU) for the Supplement of UN Regulations 151, 158, 159 and 166. Proposal adds Component and Separate Technical Units (STU) approvals requirements.
This proposal is to add Component and Separate Technical Units (STU) approvals regulatory supplement to the UN Regulation No. 159 for “Uniform provisions concerning the approval of motor vehicles with regard to the Moving Off Information System for the Detection of Pedestrians and Cyclist” .
Document identifies challenges with headlamp aiming for glare prevention. UP-DOWN aiming challenges include vehicle actual load and cut-off line definition. LEFT-RIGHT aiming challenges include references on the vehicle and kink point definition. Cut-off line definition makes it difficult to check up-down aiming; kink point definition makes it difficult to check left-right aiming. The beam pattern must be used to check alignment. The way forward includes reviewing criteria for passing-beam orientation in approval and adapting inspection criteria accordingly.
The hard-working team identified glare issues in four areas: aiming procedures lack clear definitions of cut-off line and kink point, making PTI inspection difficult; high-mounted headlamps tend to glare lower vehicles in front, and cleaning hardware and auto-levelling performance are insufficient; PTI lacks a dedicated chapter on provisions; and measurements using 75 kg on driver’s seat are impractical, alignment is not mandated at end-of-line, and no general requirements exist for headlamp testers.