Many/most Canadian model#'s are not online, esp dept store brands.
C646. is an Inglis/Admiral built Kenmore.
i pulled the paper off the back of it, looked through the schematic to no avail (i've scanned it so i have an electronic copy)
Post a copy here or a link to it here so we can have a peek.
Top middle in the fresh food section, 2 or 3 lights and couple of toggle switches?