© 2020 Centro de Informacion Tecnologica. All rights reserved. The objective of this study is to develop a methodology for improving an automotive harness manufacturing process through the implementation of an electronic bar code monitoring system that allows obtaining the traceability of the processed products and identifying the origin of the quality problems. The methodology consists of an initial diagnosis of the area, the development and testing of the program, and the implementation of the system within the area, as well as the training of the personnel involved. The main defects of the area of foam injection were found, and with the help of the traceability system it was possible to identify the root causes of them, for which specific actions were taken. After three months of implementation the percentage was reduced by 15% of the main defect found.