I set this up as a subroutine since I use it often. I put the subroutine in a Module that I renamed as FileFunctions. This allows me to use it anywhere I want with a single line of code.
Sub AutoSave(Setting As Boolean)
Workbooks("autosave.xla"

.Excel4IntlMacroSheets("Loc Table"

_
.Range("ud01n.Do_Save"

.Value = Setting
Run "autosave.xla!mcs05.ClearOnTime"
Run "autosave.xla!mcs03.SetOnTime"
Run "autosave.xla!mcs01.CheckCommand"
End Sub
The above goes in FileFunctions as it is above. This is the exact cut-and-paste syntax that you can take with you. I don't reccomend changing anything. To use this function, go find the space in the code where you want to toggle AutoSave and enter the line
Call FileFunctions.AutoSave(true)
to turn it on. Replace true with false to turn it off.
Hope this helps.