To begin, remove the rear seat backrest for the E90 model, and for the E91 and E92 models, remove the rear right backrest side bolster. Next, disconnect the electrical connectors, remove the fasteners, and take out the EKP module. The installation process is the reverse of removal. If replacing with a new unit, code or program the EKP module, and ensure to check for fault codes and reset the ECM memory.