Alarm System - False Activation

89Ford22

ALARM SYSTEM-FALSELY ACTIVATED-VEHICLES BUILT BEFORE 2/20/89

LOCK-TRUNK-BENT CYLINDER TAB FALSELY ACTIVATES ALARM-VEHICLES BUILT BEFORE 2/20/89

Article No. 89-15-2

FORD: 1989 THUNDERBIRD

LINCOLN-MERCURY: 1988-89 CONTINENTAL, MARK VII, TOWN CAR
1989 COUGAR

Figure 1:

ISSUE: The anti-theft alarm system may be falsely activated 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 Section 44-10 of the appropriate Shop Manual for service details.

2. Examine the tab portion of the anti-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 lock cylinder application chart for the correct service part numbers.

4. If the tab is OK, reinstall the trunk lock cylinder and do the following steps.

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.

LOCK CYLINDER APPLICATION CHART

MODEL
YEAR CARLINE PART NUMBER

1988/1989 Continental E90Y-5443507-A
1988/1989 Town Car E9VY-5443507-A
1988/1989 Mark VII E9LY-6343507-A
1989 T-Bird/Cougar E9SZ-634507-D

PART NUMBER PART NAME CLASS

E90Y-5443507-A Lock Cylinder C
E9VY-5443507-A Lock Cylinder B
E9LY-6343507-A Lock Cylinder B
E9SZ-6343507-D Lock Cylinder C

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty Coverage

OPERATION DESCRIPTION TIME
891502A Continental 0.8 Hr.
891502A Thunderbird, Cougar 0.6 Hr.
891502A Town Car, Mark VII 0.5 Hr.

DEALER CODING
BASIC PART NO. CONDITION CODE
7043507 02
OASIS CODES: 2900, 1200