Exhibit 31.2 PRINCIPAL FINANCIAL OFFICER CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002  I, Gerald G. Sax,
certify that: 1. I have reviewed this annual report on Form 10-K of Viasystems,
Inc.; 2. Based on my knowledge, this report does not contain any untrue
statement of a material fact or omit to state a material fact necessary to make
the statements made, in light of the circumstances under which such statements
were made, not misleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other
financial information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows of the
registrant as of, and for, the periods presented in this report; 4. The registrants other certifying officer(s) and I are responsible
for establishing and maintaining disclosure controls and procedures (as defined
in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and have: a) Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those entities,
particularly during the period in which this report is being prepared; b) Designed such internal control over financial reporting, or caused
such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for external
purposes in accordance with generally accepted accounting principles; c) Evaluated the effectiveness of the registrants disclosure
controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and d) Disclosed in this report any change in the registrants internal
control over financial reporting that occurred during the registrants most
recent fiscal quarter (the registrants fourth fiscal quarter in the case of an
annual report) that has materially affected, or is reasonably likely to
materially affect, the registrants internal control over financial reporting;
and 5. The registrants other certifying officer(s) and I have disclosed,
based on our most recent evaluation of internal control over financial
reporting, to the registrants independent certified public accountants and the
Audit Committee of registrants Board of Directors (or persons performing the
equivalent functions): a) All significant deficiencies and material weaknesses in the design
or operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrants ability to record, process,
summarize and report financial information; and b) Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrants internal control
over financial reporting. Date: March 28, 2008  /s/ Gerald G. Sax Gerald G. Sax Chief Financial Officer    Exhibit 32 CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF
FINANCIAL OFFICER PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. 1350)  Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
(subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States
Code), each of the undersigned officers of Viasystems, Inc., a Delaware
corporation (the Company), does hereby certify that, to the best of their
knowledge: The Annual Report on Form 10-K for the fiscal year ended December
31, 2007 (the Form 10-K) of the Company fully complies with the requirements
of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and information
contained in the Form 10-K fairly presents, in all material respects, the
financial condition and results of operations of the Company. Date: March 28, 2008 /s/ David M. Sindelar David M. Sindelar Chief Executive Officer  Date: March 28, 2008 /s/ Gerald G. Sax Gerald G. Sax Chief Financial Officer       2 3/28/2008 7:23 AM