Can I use the SAI system infrared (PIR) to control lights if the SAI is off?

Yes, depending on the situation: If the SAI is interfaced to a Convimar control unit (20510-16950-14510), it must first be configured in the SAI control unit and then in the configuration menu of the Convimar control unit. If the SAI is interfaced to a By-me (21550-20550-14550), it must first be configured in the SAI and then in a maximum of 4 other groups in the home automation section of the By-me control unit.