Displays arylsulfatase activity at neutral pH, when co- expressed with SUMF1; arylsulfatase activity is measured in the secretion medium of retinal cell line, but no activity is recorded when measured in cell extracts (PubMed:19262745). Lacks arylsulfatase activity (PubMed:16500042). {ECO:0000269|PubMed:16500042, ECO:0000269|PubMed:19262745}. This is the function of ARSI (arylsulfatase family member I, ENSG00000183876).