[AMBAC company logo]                             4 EAST MIFFLIN STREET, MADISON,
CERTIFICATE GUARANTY INSURANCE POLICY            WISCONSIN 53703
                                                 ADMINISTRATIVE OFFICE:
                                                 One State Street Plaza,
                                                 New York, New York 10004
                                                 Telephone: (212) 668-0340


Insured Obligations:                                 Policy Number:

Fremont Home Loan Trust 1999-3                       AB0294BE
Home Loan Asset Backed Certificates,
Series 1999-3

                                                     Premium:

                                                     As specified in the
                                                     endorsement attached hereto

AMBAC  ASSURANCE  CORPORATION  (AMBAC) A Wisconsin  Stock  Insurance  Company in
consideration  of the  payment of the  premium  and subject to the terms of this
Policy, hereby agrees  unconditionally and irrevocably to pay to the Trustee for
the  benefit  of the  Holders of the  Insured  Obligations  that  portion of the
Insured Amounts which shall become Due for Payment but shall be unpaid by reason
of Nonpayment.

Ambac will make such  payments to the Trustee from its own funds on the later of
(a) one (1) Business Day  following  notification  to Ambac of Nonpayment or (b)
the Business Day on which the Insured Amounts are Due for Payment. Such payments
of principal or interest shall be made only upon  presentation  of an instrument
of assignment in form and substance satisfactory to Ambac, transferring to Ambac
all rights  under such  Insured  Obligations  to receive  the  principal  of and
interest  on the  Insured  Obligation.  Ambac  shall  be  subrogated  to all the
Holders'  rights to  payment  on the  Insured  Obligations  to the extent of the
insurance  disbursements so made. Once payments of the Insured Amounts have been
made to the Trustee, Ambac shall have no further obligation hereunder in respect
of such insured Amounts.

In the event the Trustee for the Insured Obligations has notice that any payment
of  principal  or  interest  on an Insured  Obligation  which has become Due for
Payment  and which is made to a Holder by or on behalf of the  Trustee  has been
deemed a  preferential  transfer  and  theretofore  recovered  from  its  Holder
pursuant  to the  United  States  Bankruptcy  Code in  accordance  with a final,
nonappealable  order of a court of competent  jurisdiction,  such Holder will be
entitled  to payment  from Ambac to the extent of such  recovery  if  sufficient
funds are not otherwise available.

This  Policy is  noncancelable  by Ambac for any  reason  including  failure  to
receive payment of any premium due hereunder.  The premium on this Policy is not
refundable  for any  reason.  This Policy  does not insure  against  loss of any
prepayment  or other  acceleration  payment  which at any time may become due in
respect of any Insured  Obligation,  other than at the sole option of Ambac, nor
against any risk other than Nonpayment, including failure of the Trustee to make
any payment due Holders of Insured Amounts.

To the fullest  extent  permitted by  applicable  law,  Ambac hereby  waives and
agrees not to assert any and all rights and defenses,  to the extent such rights
and defenses may be available to Ambac to avoid payment of its obligations under
this Policy in accordance with the express provisions hereof.

Any capitalized terms not defined herein shall have the meaning given such terms
in the endorsement attached hereto or in the Agreement.

In  witness  whereof,  Ambac  has  caused  this  Policy to be  affixed  with its
corporate seal and to be signed by its duly authorized  officers in facsimile to
become  effective as their original  signatures and binding upon Ambac by virtue
of the countersignature of its duly authorized representative.


President                                              Secretary

Effective Date:  September 23, 1999                    Authorized Representative




                CERTIFICATE GUARANTY INSURANCE POLICY ENDORSEMENT


Attached to and forming                           Effective Date of Endorsement:
part of Policy #AB0294BE                                      September 23, 1999
issued to:


The Bank of New York,
as Trustee for the Holders of Fremont Home Loan Trust 1999-3,
Home Loan Asset Backed Certificates, Series 1999-3


                  For all purposes of this  Policy,  the  following  terms shall
have the following meanings:

                  "Agreement"  shall  mean  the  Pooling  and  Master  Servicing
Agreement dated as of September 1, 1999 among  PaineWebber  Mortgage  Acceptance
Corporation  IV, as Depositor,  Fremont  Investment & Loan,  as  Transferor  and
Master Servicer,  and The Bank of New York, as Trustee, as such Agreement may be
amended,  modified  or  supplemented  from  time  to time  as set  forth  in the
Agreement.

                  "Certificate  Insurance  Policy" or  "Policy"  shall mean this
Certificate  Guaranty  Insurance Policy together with each and every endorsement
hereto.

                  "Certificates"  means,  collectively,  the  Fremont  Home Loan
Trust 1999-3, Home Loan Asset-Backed Certificates,  Series 1999-3, Class A-1 and
Class A-2,  substantially  in the form set forth in Exhibits G- 1 and G-2 to the
Agreement.

                  "Collection  Account"  shall  have  the  meaning  set forth in
Section 5.0l(a)(i) of the Agreement.

                  "Distribution  Date"  shall mean the 25th day of any month (or
if such 25th day is not a  Business  Day,  the first  Business  Day  immediately
following) beginning with the First Distribution Date.

                  "Due for  Payment"  shall  mean,  with  respect to any Insured
Amount or  Preference  Amount,  such amount is due and  payable  pursuant to the
terms of the Pooling and Servicing Agreement.

                  "First Distribution Date" shall mean October 25, 1999.

                  "Holder" shall  mean the  registered owner or beneficial owner
of any Certificate.

                  "Insurance  Agreement"  shall mean the Insurance and Indemnity
Agreement, dated as of September 23, 1999, among Ambac Assurance Corporation, as
Securities  Insurer,  Fremont  Investment  &  Loan,  as  Transferor  and  Master
Servicer,  PaineWebber Mortgage Acceptance  Corporation IV, as Depositor and The
Bank of New York,  as  Trustee,  as such  Insurance  Agreement  may be  amended,
modified or supplemented from time to time.

                  "Insured  Amount"  shall  mean,  with  respect to any Class of
Class  A  Certificates  and  for  any  Distribution  Date,  the  sum of (1)  any
insufficiency  resulting  from  (a) the sum of (i)  the  Available  Distribution
Amount  for the  related  Pool and (ii) the  excess,  if any,  of the  Available
Distribution  Amount  for the other Pool over the  Certificateholders'  Interest
Distribution  Amount  for the  other  Class  of  Class A  Certificates  for that
Distribution  Date,  being  less  than  (b)  the  Certificateholders'   Interest
Distribution Amount for such Class of Class A Certificates,  less any Relief Act
Shortfalls, and (2) any Certificateholders' Principal Deficiency Amount.

                  "Insured   Payments"   shall   mean,   with   respect  to  any
Distribution  Date, the aggregate amount actually paid by the Securities Insurer
to The Trustee in respect of (i) Insured Amounts for such  Distribution Date and
(ii) Preference Amounts for any given Business Day.

                  "Late Payment Rate" shall mean for any Distribution  Date, the
greater of (i) the rate of  interest,  as it is publicly  announced by Citibank,
N.A. at its principal office in New York, New York as its prime rate (any change
in such  prime  rate of  interest  to be  effective  on the date such  change is
announced by Citibank,  N.A.) plus 1% and (ii) the then applicable  highest rate
of interest on the Certificates.  The Late Payment Rate shall be computed on the
basis of a year of 360 days and the actual number of days  elapsed.  In no event
shall the Late  Payment  Rate  exceed the  maximum  rate  permissible  under any
applicable law limiting interest rates.

                  "Nonpayment"  shall  mean,  with  respect to any  Distribution
Date, an Insured Amount is Due for Payment but has not been paid pursuant to the
Pooling and Servicing Agreement.

                  "Notice"  shall mean the  telephonic  or  telegraphic  notice,
promptly confirmed in writing by telecopy substantially in the form of Exhibit A
to the Policy, the original of which is subsequently  delivered by registered or
certified  mail,  from the Trustee  specifying the Insured Amount which shall be
due and owing on the applicable Distribution Date.

                  "Preference  Amount" shall mean any payment of Insured Amounts
on a Certificate  which has become Due for Payment and which is made to a Holder
by or on behalf of the Trustee which has been deemed a preferential transfer and
theretofore  recovered from its Holder pursuant to the United States  Bankruptcy
Code in  accordance  with a final,  nonappealable  order of a court of competent
jurisdiction.

                  "Premium"  shall  mean the amount  payable  to the  Securities
Insurer on each Distribution Date calculated at the Premium Percentage.

                  "Premium Percentage" shall  have  the meaning set forth in the
Insurance Agreement.

                  "Reimbursement  Amount"  shall  mean,  as to any  Distribution
Date, the sum of (x) (i) all Insured  Payments paid by the  Securities  Insurer,
but for which  the  Securities  Insurer  has not been  reimbursed  prior to such
Distribution   Date  pursuant  to   Section  5.01(d)  of  the   Agreement,  plus
(ii) interest accrued thereon,  alculated at the Late Payment Rate from the date
the Trustee received the related Insured Payments,  and (y) without  duplication
(i) any  amounts  then  due  and  owing  to  the  Securities  Insurer  under the
Insurance Agreement plus (ii) interest on such amounts at the Late Payment Rate.

                  "Relief  Act  Shortfalls"   shall  mean  interest   shortfalls
resulting from the application of the Soldiers' and Sailors' Civil Relief Act of
1940, as amended.

                  "Securities  Insurer" shall mean Ambac Assurance  Corporation,
or any successor thereto, as issuer of the Certificate Insurance Policy.

                  "Total  Available  Funds" shall mean,  as to each Pool and for
any Distribution Date, the sum of (i) the Available Distribution Amount for such
Pool and (ii) any Excess Spread available from the other Pool.

                  "Trustee"   shall   mean   The   Bank  of  New   York  or  its
successor-in-interest, in its capacity as Trustee under the Agreement, or if any
successor Trustee or any co-trustee shall be appointed as provided therein, then
"Trustee" shall also mean such successor trustee or such co-trustee, as the case
may be, subject to the provisions thereof.

                  Capitalized  used herein and not otherwise  defined shall have
the meaning assigned to them in the Agreement.

                  As provided by the Policy, the Securities Insurer will pay any
amount  payable  hereunder no later than 12:00 noon,  New York City time, on the
later of the Distribution Date on which the related Insured Amount is due or the
Business Day  following  receipt in New York,  New York on a Business Day by the
Securities Insurer of a Notice;  provided that, if such Notice is received after
12:00 noon,  New York City time,  on such  Business Day, it will be deemed to be
received on the following Business Day. If any such Notice is not in proper form
or is otherwise insufficient for the purpose of making a claim under the Policy,
it shall be deemed not to have been received for purposes of this paragraph, and
the Securities  Insurer shall promptly so advise the Trustee and the Trustee may
submit an amended Notice.

                  The Securities  Insurer shall make Insured  Payments which are
Preference  Amounts  out of its own funds by 12:00  noon (New York City time) in
immediately available funds to the Trustee or Certificateholders, as applicable,
on the  later of (a) the  Business  Day  next  following  the day on  which  the
Securities  Insurer  shall have  received the items  referred to in clauses (i),
(ii), (iii) and (iv) below and (b) the date pursuant to the Order,  upon receipt
of (i) a certified copy of a final, nonappealable order of a court or other body
exercising  jurisdiction  in such  insolvency  proceeding to the effect that the
Trustee or the  Certificateholder,  as  applicable,  is  required to return such
Preference Amount paid during the term of this Policy because such payments were
avoided as a  preferential  transfer or  otherwise  rescinded  or required to be
restored  by  the  Trustee  or  the  Certificateholder  (the  "Order"),  (ii)  a
certificate by or on behalf of the  Certificateholder  or Trustee that the Order
has been entered and is not subject to any stay,  (iii) an  assignment,  in form
and  substance  satisfactory  to  the  Securities  Insurer,  duly  executed  and
delivered  by the  Certificateholder  or Trustee,  irrevocably  assigning to the
Securities Insurer all rights and claims of the Trustee or the Certificateholder
relating to or arising under the Agreement  against the estate of the bankruptcy
trustee or otherwise  with respect to such  Preference  Amount and (iv) a Notice
appropriately  completed  and  executed by the Trustee.  Such  payment  shall be
disbursed  to the  receiver,  conservator,  debtor-in-possession  or  trustee in
bankruptcy named in the Order, and not to the Certificateholder directly, unless
the  Certificateholder  has made a payment of the Preference Amount to the court
or such  receiver,  conservator,  debtor-in-possession  or trustee in bankruptcy
named  in the  Order,  in  which  case  the  Securities  Insurer  will  pay  the
Certificateholder,  subject  to the  delivery  of (a) the items  referred  to in
clauses  (i),  (ii),  (iii)  and  (iv)  above  to  the  Securities  Insurer  and
(b) evidence satisfactory  to the Securities  Insurer that payment has been made
to such  court  or  receiver, conservator, debtor-in-possession  or  trustee  in
bankruptcy named in the Order.

                  The  Securities  Insurer  hereby  agrees  that if it  shall be
subrogated to the rights of Holders by virtue of any previous payment under this
Policy,  no recovery of such  payment  will occur  unless the full amount of the
Holders'  allocable  distributions for such Distribution Date can be made. In so
doing, the Securities  Insurer does not waive its rights to seek full payment of
all Reimbursement Amounts owed to it under the Agreement.

                  The terms  and  provisions  of the  Agreement  constitute  the
instrument of assignment referred to in the second paragraph of the face of this
Policy.

                  A premium will be payable on this Policy on each  Distribution
Date as provided in Section  5.01(d) of the Agreement,  beginning with the first
Distribution Date, in an amount equal to the Premium.

                  THE  INSURANCE  PROVIDED  BY THE POLICY IS NOT  COVERED BY THE
PROPERTY/CASUALTY INSURANCE SECURITY FUND SPECIFIED IN THE INSURANCE LAWS OF THE
STATE OF NEW YORK.

                  The Policy to which this  Endorsement is attached and of which
it forms a part is hereby amended to provide that there shall be no acceleration
payment due under the Policy unless such  acceleration  is at the sole option of
the Securities Insurer.

                  Nothing herein contained shall be held to vary,  alter,  waive
or extend any of the terms, conditions, provisions, agreements or limitations of
the above mentioned Policy other than as above stated.

                  This  Policy is issued  under and  pursuant  to,  and shall be
construed under, the laws of the State of New York.

                  IN WITNESS  WHEREOF,  the  Securities  Insurer has caused this
Endorsement to the Policy to be signed by its duly authorized officers.



- ------------------------------                ----------------------------------
Assistant Secretary                           Vice President


                                    EXHIBIT A
                  TO THE CERTIFICATE GUARANTY INSURANCE POLICY
                  --------------------------------------------
                               Policy No. AB0294BE

                         NOTICE OF NONPAYMENT AND DEMAND
                         FOR PAYMENT OF INSURED AMOUNTS



                                                         Date: [     ]

Ambac Assurance Corporation
One State Street Plaza
New York, New York 10004
Attention:  General Counsel

          Reference  is  made  to  Certificate  Guaranty  Insurance  Policy  No.
AB0294BE (the "Policy") issued by Ambac Assurance Corporation  ("Ambac").  Terms
capitalized  herein and not otherwise defined shall have the meanings  specified
in the  Policy  and the  Agreement,  as the  case  may be,  unless  the  context
otherwise requires.

          The Trustee hereby certifies as follows:

          1.   The Trustee is the Trustee under the Agreement for the Holders.

          2.   The relevant Distribution Date is [date].

          3.   Payment on  the  Certificates in respect of the Distribution Date
               is due to be received on  _________________________________ under
               the Agreement, in  an amount equal to $_______________________.

          4.   There is an Insured Amount of $_______________________________ in
               respect  of  the  Certificates,  which  amount is Due for Payment
               pursuant to the terms of the Agreement.

          5.   The  Trustee  has not  heretofore  made a demand for the  Insured
               Amount in respect of the Distribution Date.

          6.   The Trustee  hereby  requests  the payment of the Insured  Amount
               that is Due For  Payment  be made by Ambac  under the  Policy and
               directs  that payment  under the Policy be made to the  following
               account by bank wire  transfer  of  federal or other  immediately
               available  funds in  accordance  with the terms of the Policy to:
               __________________________________(Trustee's account number).

          7.   The Trustee hereby agrees that,  following receipt of the Insured
               Payment  from Ambac,  it shall (a) hold such amounts in trust and
               apply the same  directly  to the  distribution  of payment on the
               Certificates  when due;  (b) not apply  such  funds for any other
               purpose;  (c) deposit such funds to the  Certificate  Account and
               not  commingle  such funds with other funds held by the  Trustee;
               and (d) maintain an accurate record of such payments with respect
               to each certificate and the corresponding claim on the Policy and
               proceeds thereof.

          ANY PERSON WHO  KNOWINGLY  AND WITH  INTENT TO DEFRAUD  ANY  INSURANCE
COMPANY OR OTHER PERSON FILES AN APPLICATION FOR INSURANCE OR STATEMENT OF CLAIM
CONTAINING  ANY  MATERIALLY  FALSE  INFORMATION,  OR CONCEALS FOR THE PURPOSE OF
MISLEADING,   INFORMATION  CONCERNING  ANY  FACT  MATERIAL  THERETO,  COMMITS  A
FRAUDULENT  INSURANCE  ACT WHICH IS A CRIME AND SHALL ALSO BE SUBJECT TO A CIVIL
PENALTY NOT TO EXCEED FIVE  THOUSAND  DOLLARS AND THE STATED  VALUE OF THE CLAIM
FOR EACH SUCH VIOLATION.



                                      By:______________________________________
                                          Trustee



                                      Title:____________________________________
                                            (Officer)