Option Explicit
Option Compare Text
Const Test1 As String = 'TOTO'
Const Test2 As String = 'ZAZA'
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Application.Intersect(Range('C16:C17'), Target) Is Nothing Then Exit Sub
If Range('B10') <> Test1 Or Range('E10') <> Test2 Then
Range('A1').Activate
End If
End Sub