Alarm System - False Security Alarm

Article No.
92-21-1

October 7, 1992



^ LOCK - TRUNK - BENT CYLINDER TAB FALSELY ACTIVATES ALARM

^ ALARM SYSTEM - ACTIVATED IN ERROR



FORD:
1989-91 THUNDERBIRD

LINCOLN-MERCURY:
1988-91 CONTINENTAL, MARK VII, TOWN CAR
1989-91 COUGAR



ISSUE:
The anti-theft alarm system may be activated in error because of a bent trunk lock switch tab in the lock cylinder.

ACTION:
Install a new trunk lock cylinder by using the following service procedure.


1. Remove the trunk lock cylinder from the rear decklid sheet metal. Refer to the appropriate 1991 Service Manual, Section 44-10, for service details.





2. Examine the tab portion of the anti-theft lock switch to see if it is bent. The switch is part of the trunk lock cylinder. Refer to Figure 1 for an example of a bent tab.

3. If the tab is bent, replace the trunk lock and matching glove box lock. On Mark VII's also replace the console stowage lock. Refer to the Parts Block of this article for the correct service part numbers.

4. If the tab is OK, reinstall the trunk lock cylinder and continue as follows:

a. Check to see that the tab engages with the trunk sheet metal.

b. Check with an ohmmeter that the two terminals on the white connector of the trunk lock cylinder are an "open circuit". (There is no continuity or current between them.)



c. Replace the trunk lock cylinder and matching glove box lock if current exists between the two terminals.






PART INFORMATION



OTHER APPLICABLE ARTICLES:
None

SUPERSEDES:
89-15-2

WARRANTY STATUS:
Eligible Under Bumper To Bumper For 1991 Lincolns, Basic Warranty Coverage For 1989-91 Thunderbird/Cougar and 1988-1990 Lincolns

OPERATION DESCRIPTION TIME
922101A Continental 0.8 Hr.
922101A Thunderbird, Cougar 0.6 Hr.
922101A Town Car, Mark VII 0.5 Hr.

DEALER CODING
BASIC PART NO. CONDITION CODE
7043507 02

OASIS CODES:
112000, 205000