Radio Speakers - Distorted Sound

91ford24

Article No. 91-18-8
09/05/91


RADIO-SOUND DISTORTION FROM SPEAKERS-JBL SOUND SYSTEMS-VEHICLES BUILT BEFORE 9/1/90


FORD: 1989-91 THUNDERBIRD

LINCOLN-MERCURY: 1989-91 COUGAR, TOWN CAR

LIGHT TRUCK: 1991 EXPLORER


This TSB article is being republished in its entirety to provide vehicle application information in the Parts Block.

ISSUE: Objectional sound distortion, which sounds like speaker rattle or vibration when the sound system is set at advanced bass and/or high volume, may be caused by missing foam insulation normally added to the JBL subwoofer speaker during production.

ACTION: Install new subwoofer speakers which have been redesigned and are now available. These new subwoofer speakers can be identified by a production date code that began on August 17, 1990 and appears on the speaker enclosure. Refer to the appropriate Car or Truck Shop Manual for service details.


NOTE: THE DATE CODE ON THE ENCLOSURE WILL APPEAR AS THE DAY OF THE YEAR (COUNT 1 TO 365), FOLLOWED BY YEAR OF PRODUCTION, FOLLOWED BY SHIFT.

EXAMPLE FOR DATE CODE 22801:

^ 228 - DENOTES THE 228TH DAY OF THE YEAR, (AUGUST 17).

^ 0 - DENOTES THE 1990 YEAR OF PRODUCTION.

^ 1 OR 0 LAST DIGIT DENOTES SHIFT.


PART NUMBER PART NAME CLASS

E9WY-18808-A Enclosure Subwoofer B
(Thunderbird / Cougar)
FOVY-18808-D Enclosure Assembly Radio C
(Town Car)
F1TZ-18C804-A Enclosure Amplifier & Bracket C
Assembly (Explorer 2 Door)
F1TZ-18C804-B Enclosure Amplifier & Bracket C
Assembly (Explorer 4 Door)

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 91-8-16
WARRANTY STATUS: Eligible Under Basic Warranty
Coverage
OPERATION DESCRIPTION TIME
911808A Replace Speaker - 0.6 Hr.
Thunderbird/Cougar
911808B Replace Speaker - Town 0.3 Hr.
Car
911808C Replace Speaker - Explorer 0.6 Hr.
(Two Door)
911808D Replace Sreaker - Explorer 0.3 Hr.
(Four Door)
DEALER CODING
BASIC PART NO. CONDITION CODE
18808 56
OASIS CODES: 207000