It airs a full service, classic hits radio format and is owned and operated by Nelson Multimedia Inc. WCSJ-FM's programming includes local news, high school sports, a weekly fishing and outdoor program, and NASCAR racing.

The station began broadcasting in 1993, holding the call sign WJDK and airing an adult contemporary format.

[6] In February 1998, the station's call sign was changed to WYXX and it adopted a rhythmic oldies format branded "Chicago's Heart and Soul", simulcasting 103.1 WXXY in Highland Park, Illinois, with the station's call sign and adult contemporary format moving to 95.7.

[8][9][10] The station featured longtime Chicago area radio personalities including Robert Murphy, Fred Winston, and Mark Zander.

[15][16] In January 2004, the station's call sign was changed to WCSJ-FM, and it adopted a mix of soft oldies and adult standards as an affiliate of ABC Radio's "Timeless" network.