The station originally signed on as a CBC Television affiliate on October 18, 1959, owned by Stanley Shenkman. Shenkman also acquired the radio stationsCKSF and CKSF-FM, which both adopted the CJSS call sign as well.
In 1963, CJSS was acquired by Ernie Bushnell and converted into a rebroadcaster of Ottawa's CTV affiliate CJOH, making CJSS the first TV station in Canada ever to cease operations as its own station and become a repeater for another. The radio stations were sold to a local family, and subsequently broadcast as part of Corus Entertainment. Of these stations, AM 1220 (as CJUL) left the air August 18, 2010 leaving just CJSS-FM retaining the original call sign.