Document:

<PAGE>   1
                                                                   EXHIBIT 10.17

                       AMENDMENT NO. 1 TO CREDIT AGREEMENT

         AMENDMENT NO. 1 TO CREDIT AGREEMENT, dated as of September 24, 1999
(this "Amendment No. 1"), to the Credit Agreement dated as of August 24,1999
(the "Credit Agreement"), among Comerica Bank and the other financial
institutions from time to time parties thereto (individually, a "Bank", and
collectively, "Banks"), Comerica Bank, as Agent for the Banks (in such capacity,
"Agent"), and Saturn Electronics & Engineering, Inc., Saturn Manufacturing Co.,
and Smartflex Systems, Inc., successor in interest to SSI Acquisition Corp.
by reason of merger ("Borrowers").

                              W I T N E S S E T H:

         WHEREAS, the Banks, the Agent and the Borrowers are parties to the
Credit Agreement; and

         WHEREAS, Newco has merged with and into Smartflex pursuant to the
Merger Agreement, and the Borrowers, the Agent and the Banks wish to amend
certain of the Schedules, to the Credit Agreement to reflect the Merger and the
substitution of Smartflex for Newco as a Borrower;

         NOW, THEREFORE, in consideration of the mutual agreements contained
herein, it is hereby agreed as follows:

                     ARTICLE I -- DEFINITIONS AND AMENDMENTS

         1.1 Defined Terms. Capitalized terms used herein which are defined in
the Credit Agreement are used herein with such defined meanings.

         1.2 Substitution of Schedules. Schedules 6.3(b), 6.4, 7.9, 7.12, 7.13,
7.16, 7.18, 7.19, 7.20, 7.23, 9.1, 9.2, 9.3 and 9.8 are amended to read in their
entirety as provided in the attached schedules.

                  ARTICLE II -- REPRESENTATIONS AND WARRANTIES;
                              CONDITIONS PRECEDENT

         2.1 Representations; No Default. On and as of the effective date hereof
and after giving effect to this Amendment No. 1 and to the transactions
contemplated hereby, each Borrower hereby (i) confirms, reaffirms and restates
the representations and warranties set forth in Section 7 of the Credit
Agreement, except to the extent that such representations and

<PAGE>   2

warranties relate solely to an earlier date in which case each Borrower hereby
confirms, reaffirms and restates such representations and warranties on and as
of such earlier date, provided that the references to the Credit Agreement
therein shall be deemed to be references to the Credit Agreement as amended by
this Amendment No. 1, and (ii) represents and warrants that no Default or Event
of Default has occurred and is continuing.

         2.2 Effective Date. This Amendment No. 1 shall become effective when
Agent shall have received counterpart originals of this Amendment No. 1, in each
case duly executed and delivered by Borrowers, the Banks and the Guarantors, in
form satisfactory to Agent and the Banks.

                          ARTICLE III -- MISCELLANEOUS

         3.1 Limited Effect. Except as expressly amended hereby, all of the
provisions, covenants, terms and conditions of the Credit Agreement shall
continue to be, and shall remain, in full force and effect in accordance with
its terms.

         3.2 Expenses. The Company shall reimburse the Agent for all its
reasonable costs and expenses including, without limitation, legal expenses
incurred in connection with the preparation, execution and delivery of this
Amendment No. 1.

         3.3 Governing Law. This Amendment No. 1 shall be governed by, and
construed and interpreted in accordance with, the law of the State of Michigan.

         3.4 Counterparts. This Amendment No. 1 may be executed by one or more
parties hereto on any number of separate counterparts, and all of said
counterparts taken together shall be deemed to constitute one and the same
instrument.

         3.5 Guarantors. By its execution hereof, each Guarantor consents to the
foregoing amendments and reaffirms and ratifies all of its obligations to the
Agent and the Banks under the Guaranty.

                                        2

<PAGE>   3

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 1
to be executed and delivered by their proper and duly authorized officers or
other representatives as of the date first above written.

                    BORROWERS:

                    SATURN ELECTRONICS &
                    ENGINEERING, INC.

                    By:       /s/ Donald J. Cowie
                         ---------------------------------
                    Its:      Chief Financial Officer
                         ---------------------------------

                    SATURN MANUFACTURING CO.

                    By:       /s/ Donald J. Cowie
                         ---------------------------------
                    Its:      Chief Financial Officer
                         ---------------------------------

                    SMARTFLEX SYSTEMS, INC.

                    By:       /s/ Donald J. Cowie
                         ---------------------------------
                    Its:      Chief Financial Officer
                         ---------------------------------

                    AGENT AND BANKS:

                    COMERICA BANK, as Agent and as a Bank

                    By:       /s/ Jason L. Stoecker
                         ---------------------------------
                    Its:      AVP
                         ---------------------------------

                                        3

<PAGE>   4

                    GUARANTORS:

                    SMARTFLEX NEW JERSEY INC.

                    By:       /s/ Donald J. Cowie
                         ---------------------------------
                    Its:      Chief Financial Officer
                         ---------------------------------

                    LOGICAL SYSTEMS INC.

                    By:       /s/ Donald J. Cowie
                         ---------------------------------
                    Its:
                              Chief Financial Officer
                         ---------------------------------

                    SMARTFLEX FREMONT INC.

                    By:       /s/ Donald J. Cowie
                         ---------------------------------
                    Its:      Chief Financial Officer
                         ---------------------------------

                    SMARTFLEX NEW ENGLAND INC.

                    By:       /s/ Donald J. Cowie
                         ---------------------------------
                    Its:      Chief Financial Officer
                         ---------------------------------

                                        4

<PAGE>   5

                                 SCHEDULE 6.3(b)

                           JURISDICTION OF UCC FILINGS

I.       The Company
         a.       Michigan Secretary of State
         b.       North Carolina Secretary of State
         c.       Nash County, North Carolina
         d.       Oakland County, Michigan
         e.       Ottawa County, Michigan

VI.      Manufacturing
         a.       Ohio Secretary of State
         b.       Mississippi Secretary of State
         c.       Quitman County, MS

IV.      Newco
         a.       Delaware Secretary of State
         b.       Michigan Secretary of State

After the Smartflex Acquisition

II.      Smartflex
         a.       California Secretary of State
         b.       Orange County, California
         c.       Santa Clara County California
         d.       Alameda County, California

V.       Logical Services Incorporated
         a.       California Secretary of State
         b.       Santa Clara County, California

III.     Smartflex Freemont, Inc.
         a.       California Secretary of State
         b.       Orange County, California
         c.       Santa Clara County, California
         d.       Alameda County, California

V.       Smartflex New England, Inc.
         a.       New Hampshire Secretary of State
         b.       Hudson County, New Hampshire
         c.       Hillsborough County, New Hampshire

<PAGE>   6

IV.      Smartflex New Jersey, Inc.
         a.       New Jersey Secretary of State
         b.       Monmouth County, New Jersey

<PAGE>   7

                                  SCHEDULE 6.4

                                 LEASED PROPERTY

1.       2119 Austin
         Rochester Hills, Michigan

2.       255 Rex Blvd.
         Auburn Hills, Michigan

3.       1098 Second Street
         Marks, Mississippi

<PAGE>   8

                                  SCHEDULE 7.9

                              COMPLIANCE WITH LAWS

                                      NONE

<PAGE>   9

                                  SCHEDULE 7.12

                                   LITIGATION

                                      None

<PAGE>   10

                                  SCHEDULE 7.13

                          CONSENTS, APPROVALS, FILINGS

The respective Boards of Directors of the Borrowers have approved this Agreement
and the other Loan Documents.

<PAGE>   11

                                  SCHEDULE 7.16

                   PENSION PLANS SUBJECT TO TITLE IV OF ERISA

                                      None

<PAGE>   12

                                  SCHEDULE 7.18

                              ENVIRONMENTAL MATTERS

                                      None

<PAGE>   13

                                  SCHEDULE 7.19

                           SUBSIDIARIES OF THE COMPANY

1.       Saturn Manufacturing Co., an Ohio corporation

2.       SSI Acquisition Corp., a Delaware corporation

3.       Saturn Electronics Texas, L.L.C., a Texas limited liability company.

4.       Saturn Electronics de Juarez, S.A. de C.V., a Mexican corporation.

5.       Saturn de Monterrey, S.A. de C.V., a Mexican corporation

6.       Saturn Electronics (Barbados), Inc., a Barbados corporation

7.       Beijing Saturn Electronics Co., Ltd., a Chinese corporation

<PAGE>   14

                                  SCHEDULE 7.20

                             CONTINGENT OBLIGATIONS

         A component provided by the Company has experienced some failures. The
Company currently estimates that the cost to address this matter could range
from $200,000 to $1,500,000.

<PAGE>   15

                                  SCHEDULE 7.23

                     OWNERSHIP INTERESTS; RIGHTS TO PURCHASE

OWNERSHIP INTERESTS

1.       Saturn Electronics & Engineering, Inc.

                        Owners of Class A Voting Stock

         Wallace K. Tsuha Trust dated Oct. 14, 1991                    63.75%

         MascoTech, Inc.                                               36.25%

                        Owners of Class B Nonvoting Stock

         Tsuha Trusts                                                  63.75%

         MascoTech, Inc.                                               36.25%

2.       Saturn Manufacturing Co.

         Owned 100% by Saturn Electronics & Engineering, Inc.

3.       SSI Acquisition Corp.

         Owned 100% by Saturn Electronics & Engineering, Inc.

4.       Saturn Electronics Texas, L.L.C.

                           Owners of Voting Interests

               Saturn Electronics & Engineering, Inc.                     55%

               Lear Corporation (formerly United Technologies
               Automotive, Inc.)                                          45%

                         Owners of Non-Voting Interests

               Roland Lartigue                                           100%
                      (2% total Interests)

5.       Saturn Electronics de Juarez, S.A. de C.V.
<PAGE>   16

                           Series B-1

         Saturn Electronics Texas, L.L.C.                               99.9%

         Saturn Electronics & Engineering, Inc.                           .1%

                           Series B-2

         Saturn Electronics Texas, L.L.C.                                100%

6.       Saturn de Monterrey, S.A. de C.V.

                           Series B-1

         Saturn Manufacturing Co.                                       99.9%

         Wallace K. Tsuha, Jr.                                            .1%

                           Series B-2

         Saturn Manufacturing Co.                                        100%

7.       Saturn Electronics (Barbados), Inc.

         Saturn Electronics & Engineering, Inc.                          100%

8.       Beijing Saturn Electronics Co., Ltd.

         Saturn Electronics & Engineering, Inc.                           57%

         Beinei Group Corporation                                         38%

         China Modernization Institute, Inc.                               5%]

<PAGE>   17

OUTSTANDING RIGHTS

1.       Under the 1995 Management Stock Option Program, certain directors,
         officers and executive personnel of Saturn Electronics & Engineering,
         Inc. and its subsidiaries are eligible to receive stock options to
         acquire stock in Saturn Electronics & Engineering, Inc.

9.       Under the Stockholders Agreement dated March 21, 1995, as amended, the
         stockholders of Saturn Electronics & Engineering, Inc. have pre-emptive
         rights in accordance with Section 343 of the Michigan Business
         Corporation Act as specified in such agreement.

10.      Under the Membership Interest Agreement dated February, 28, 1999
         between Saturn Electronics Texas, L.L.C. (Saturn/Texas) and Roland E.
         Lartigue, Mr. Lartigue has been granted a one percent Non-Voting
         percentage interest in Saturn/Texas which will vest on February 28,
         2000 if Mr. Lartigue is employed by Saturn/Texas on this date. In
         addition, Mr. Lartigue is eligible to receive an additional one percent
         Non-Voting percentage interest in Saturn/Texas on February 28, 2000,
         which will vest on February 28, 2001 if Mr. Lartigue is employed by
         Saturn/Texas on this date.

<PAGE>   18

                                  SCHEDULE 9.1

                                  INDEBTEDNESS

There are currently outstanding loans owed to Comerica Bank pursuant to the
Credit Agreement dated as of September 20, 1995, as amended, with Saturn
Electronics & Engineering, Inc. and Saturn Manufacturing Co.

<PAGE>   19

                                  SCHEDULE 9.2

                                     LIENS
<TABLE>
<CAPTION>
         -------------------------------------------------------------------------------------------------------------------
          Jurisdiction            Date                   File #            Secured Party        Debtor
         -------------------------------------------------------------------------------------------------------------------
<S>                             <C>                    <C>               <C>                  <C>
          Michigan Secretary of   4/12/99                D502002           Rockford             Saturn Electronics &
          State                                                                                 Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   4/12/99                D502001           Rockford             Saturn Electronics &
          State                                                                                 Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   11/10/98               D442187           IBM Credit           Saturn Electronics &
          State                                                            Corporation          Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   3/17/98                D350413           IKON Office          Saturn Electronics &
          State                                                            Solutions            Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   12/10/97               D314025           Advance Acceptance   Saturn Electronics &
          State                                                            Corporation          Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   5/9/97                 D230741           IBM Credit           Saturn Electronics &
          State                                                            Corporation          Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   12/9/96                 80742B           Octel Capital        Saturn Electronics &
          State                                                                                 Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   5/16/96                D096611           Dougherty            Saturn Electronics &
          State                                                            Equipment Company,   Engineering, Inc.
                                                                           Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   9/16/96                D138646           Clarklift of         Saturn Electronics &
          State                                                            Detroit, Inc.        Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Michigan Secretary of   9/16/96                D131112           Clarklift of         Saturn Electronics &
          State                                                            Detroit, Inc.        Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          North Carolina,         4/5/99                 1990033088        Rockford             Saturn Electronics &
          Secretary of State                                                                    Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          North Carolina,         4/5/99                 1990033087        Rockford             Saturn Electronics &
          Secretary of State                                                                    Engineering, Inc.

         -------------------------------------------------------------------------------------------------------------------

          North Carolina,         12/30/97               001534530         Mellon First         Saturn Electronics &
          Secretary of State                                               United Leasing       Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          North Carolina,         5/16/96                1340915           Dougherty            Saturn Electronics &
          Secretary of State                                               Equipment Company,   Engineering, Inc.
                                                                           Inc.
         -------------------------------------------------------------------------------------------------------------------

          North Carolina, Nash    4/5/99                 99-848            Rockford             Saturn Electronics &
          County                                                           Industries, Inc.     Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          North Carolina, Nash    4/5/99                 99-847            Rockford             Saturn Electronics &
          County                                                           Industries, Inc.     Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          North Carolina, Nash    5/14/96                961515            Dougherty            Saturn Electronics &
          County                                                           Equipment Company,   Engineering, Inc.
                                                                           Inc.
         -------------------------------------------------------------------------------------------------------------------

          Mississippi,            4/2/99                 1309588           Rockford             Saturn Electronics &
          Secretary of State                                               Industries, Inc.     Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Mississippi,            4/2/99                 1309584           Rockford             Saturn Electronics &
          Secretary of State                                               Industries, Inc.     Engineering, Inc.
         -------------------------------------------------------------------------------------------------------------------

          Mississippi,            1/8/99                 1284082           Associates           Saturn Electronics &
          Secretary of State                                               Commercial           Engineering, Inc.
                                                                           Corporation (a/k/a   AND
                                                                           AT&T Commercial      Saturn Manufacturing Co.
                                                                           Corporation)
         -------------------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>   20

                                  SCHEDULE 9.3

                              GUARANTEE OBLIGATIONS

                                      None

<PAGE>   21

                                  SCHEDULE 9.8

                                   INVESTMENTS

            Investments in all existing subsidiaries of Saturn Electronics &
Engineering, Inc.<PAGE>   1
                                                                   EXHIBIT 10.18

                       AMENDMENT NO. 2 TO CREDIT AGREEMENT

         AMENDMENT NO. 2 TO CREDIT AGREEMENT, dated as of November 10, 1999
(this "Amendment No. 2"), to the Credit Agreement dated as of August 24,1999, as
amended by Amendment No. 1 dated as of September 24, 1999 (the "Credit
Agreement"), among Comerica Bank and the other financial institutions from time
to time parties thereto (individually, a "Bank", and collectively, "Banks"),
Comerica Bank, as Agent for the Banks (in such capacity, "Agent"), and Saturn
Electronics & Engineering, Inc., Saturn Manufacturing Co., and Smartflex
Systems, Inc., successor in interest to SSI Acquisition Corp. by reason of
merger ("Borrowers").

                              W I T N E S S E T H:

         WHEREAS, the Banks, the Agent and the Borrowers are parties to the
Credit Agreement; and

         WHEREAS, the Borrowers, the Agent and the Banks wish to amend an
incorrect cross reference in the Credit Agreement;

         NOW, THEREFORE, in consideration of the mutual agreements contained
herein, it is hereby agreed as follows:

                     ARTICLE I -- DEFINITIONS AND AMENDMENTS

         1.1 Defined Terms. Capitalized terms used herein which are defined in
the Credit Agreement are used herein with such defined meanings.

         1.2 Amendment to Section 2.5. Section 2.5(e)(i) and (ii) are amended by
deleting the references to Section 10.1(j) where they appear therein and
replacing them with Section 10.1(k).

                  ARTICLE II -- REPRESENTATIONS AND WARRANTIES;
                                 CONDITIONS PRECEDENT

         2.1 Representations; No Default. On and as of the effective date hereof
and after giving effect to this Amendment No. 2 and to the transactions
contemplated hereby, each Borrower hereby (i) confirms, reaffirms and restates
the representations and warranties set forth in Section 7 of the Credit
Agreement, except to the extent that such representations and warranties relate
solely to an earlier date in which case each Borrower hereby confirms, reaffirms
and restates such representations and warranties on and as of such earlier date,
provided that the references to the Credit Agreement therein shall be deemed to
be references to the Credit

                                        1

<PAGE>   2

Agreement as amended by this Amendment No. 2, and (ii) represents and warrants
that no Default or Event of Default has occurred and is continuing.

         2.2 Effective Date. This Amendment No. 2 shall become effective when
Agent shall have received counterpart originals of this Amendment No. 2, in each
case duly executed and delivered by Borrowers, the Banks and the Guarantors, in
form satisfactory to Agent and the Banks.

                          ARTICLE III -- MISCELLANEOUS

         3.1 Limited Effect. Except as expressly amended hereby, all of the
provisions, covenants, terms and conditions of the Credit Agreement shall
continue to be, and shall remain, in full force and effect in accordance with
its terms.

         3.2 Expenses. The Company shall reimburse the Agent for all its
reasonable costs and expenses including, without limitation, legal expenses
incurred in connection with the preparation, execution and delivery of this
Amendment No. 2.

         3.3 Governing Law. This Amendment No. 2 shall be governed by, and
construed and interpreted in accordance with, the law of the State of Michigan.

         3.4 Counterparts. This Amendment No. 2 may be executed by one or more
parties hereto on any number of separate counterparts, and all of said
counterparts taken together shall be deemed to constitute one and the same
instrument.

         3.5 Guarantors. By its execution hereof, each Guarantor consents to the
foregoing amendments and reaffirms and ratifies all of its obligations to the
Agent and the Banks under the Guaranty.

                                        2

<PAGE>   3

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 2
to be executed and delivered by their proper and duly authorized officers or
other representatives as of the date first above written.

                                           BORROWERS:

                                           SATURN ELECTRONICS &
                                           ENGINEERING, INC.

                                           By:  /s/ Donald J. Cowie
                                               ---------------------------------
                                           Its: CFO
                                               ---------------------------------

                                           SATURN MANUFACTURING CO.

                                           By:  /s/ Donald J. Cowie
                                               ---------------------------------
                                           Its: CFO
                                               ---------------------------------

                                           SMARTFLEX SYSTEMS, INC.

                                           By:  /s/ Donald J. Cowie
                                               ---------------------------------
                                           Its: CFO
                                               ---------------------------------

                                           AGENT AND BANKS:

                                           COMERICA BANK, as Agent and as a Bank

                                           By:
                                               ---------------------------------
                                           Its:
                                               ---------------------------------

                                        3

<PAGE>   4

                                           GUARANTORS:

                                           SMARTFLEX NEW JERSEY INC.

                                           By: /s/ Donald J. Cowie
                                               ---------------------------------
                                           Its: CFO
                                               ---------------------------------

                                           LOGICAL SYSTEMS INC.

                                           By: /s/ Donald J. Cowie
                                               ---------------------------------
                                           Its: CFO
                                               ---------------------------------

                                           SMARTFLEX FREMONT INC.

                                           By: /s/ Donald J. Cowie
                                               ---------------------------------
                                           Its: CFO
                                               ---------------------------------

                                           SMARTFLEX NEW ENGLAND INC.

                                           By: /s/ Donald J. Cowie
                                               ---------------------------------
                                           Its: CFO
                                               ---------------------------------

                                        4

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