Access - What's wrong with this query

SELECT TabCustomers.*,
       TabCustomers.CustomerForname AS NameSearch,
       TabCustomers.CustomerSurname AS SurnameSearch,
       TabCustomers.CustomerDOB AS DOBSearch,
       TabCustomers.CustomerID AS MemberSearch
FROM TabCustomers
WHERE IIf([Forms]![FrmSearchCustomer]![SearchMember] Is Null
          ,True
          ,[Forms]![FrmSearchCustomer]![SearchMember]=[customerid])=True
      AND IIf([Forms]![FrmSearchCustomer].[SearchFore] Is Null
              ,True
              ,[Forms]![FrmSearchCustomer]![SearchFore] Like [customerforname] & "*")=True
      AND IIf([Forms]![FrmSearchCustomer]![SearchLast] Is Null
              ,True
              ,[Forms]![FrmSearchCustomer]![SearchLast] Like [customersurname] & "*")=True
      AND IIf([Forms]![FrmSearchCustomer]![Searchdate] Is Null
              ,True
              ,[Forms]![FrmSearchCustomer]![Searchdate] Like [customerDOB] & "*")=True;

selectClause = "SELECT TabCustomers.* FROM TabCustomers"
if not isnull(Forms!FrmSearchCustomer!SearchMember) then
    whereClause = whereClause & application.buildCriteria(your field name, your field type, your control value) &  " AND "
endif
if not isnull(Forms!FrmSearchCustomer!SearchFore) then
    whereClause = whereClause & application.buildCriteria(...) &  " AND "
endif
if not isnull(Forms!FrmSearchCustomer!SearchLast) then
    whereClause = whereClause & application.buildCriteria(...) &  " AND "
endif
if not isnull(Forms!FrmSearchCustomer!SearchDate) then
    whereClause = whereClause & application.buildCriteria(...) & " AND "
endif
--get rid of the last "AND"
if len(whereClause) > 0 then
     whereClause = left(whereClause,len(whereClause)-5)
     selectClause = selectClause & " WHERE " & whereClause
endif
-- your SELECT instruction is ready ...

For each ctl in myForm.section(acHeader).controls
    if ctl.name like "search_"
        fld = myForm.recordset.fields(mid(ctl.name,8))
        if not isnull(ctl.value) then
           whereClause = whereClause & buildCriteria(fld.name ,fld.type, ctl.value) & " AND "
        endif
    endif
next ctl
if len(whereClause)> 0 then ...

SELECT TabCustomers.*
FROM TabCustomers
WHERE (Forms!FrmSearchCustomer!SearchMember Is Null Or Forms!FrmSearchCustomer!SearchMember=[customerid])
And (Forms!FrmSearchCustomer.SearchFore Is Null Or [customerforname] Like Forms!FrmSearchCustomer!SearchFore & "*")
And (Forms!FrmSearchCustomer!SearchLast Is Null Or [customersurname] Like Forms!FrmSearchCustomer!SearchLast & "*")
And (Forms!FrmSearchCustomer!Searchdate Is Null Or [customerDOB] Like Forms!FrmSearchCustomer!Searchdate & "*");

,[customerforname] Like  """" & [Forms]![FrmSearchCustomer]![SearchFore] & "*""" )=True

,[Forms]![FrmSearchCustomer]![SearchFore] Like ([customerforname] & "*"))=True

SELECT TabCustomers.CustomerForname AS NameSearch, TabCustomers.CustomerSurname AS SurnameSearch, TabCustomers.CustomerDOB AS DOBSearch, TabCustomers.customerid AS MemberSearch
FROM TabCustomers
WHERE TabCustomers.customerid Like IIf([Forms]![FrmSearchCustomer].[Searchmember] Is Null,"*",[Forms]![FrmSearchCustomer]![Searchmember])
AND Trim(TabCustomers.CustomerForname & "") Like IIf([Forms]![FrmSearchCustomer].[SearchFore] Is Null,"*",[Forms]![FrmSearchCustomer]![SearchFore] & "*")
AND Trim(TabCustomers.CustomerSurname & "") like IIf([Forms]![FrmSearchCustomer].[Searchlast] Is Null,"*",[Forms]![FrmSearchCustomer]![SearchLast] & "*")
AND (TabCustomers.CustomerDOB Like IIf([Forms]![FrmSearchCustomer].[SearchDate] Is Null,"*",[Forms]![FrmSearchCustomer]![SearchDate] ) Or TabCustomers.CustomerDOB Is Null)