(B) Anti-Theft Warning - Inadvertent Alarm Activation

(B-1) - ANTI-THEFT PROTECTION SYSTEM - ALARM SOUNDS INADVERTENTLY - HOOD SWITCH TOO LOW OR DOOR SWITCH SHORTED - 1993 MARK VIII

Article 93-19-5

ISSUE:
This article deals with door lock motors that may run continuously, causing a buzzing noise. The customer will be able to exit the vehicle, but may be locked out of the vehicle with the engine running. There may be continuous "pull-down" of door locks or the alarm may sound inadvertently.

Potential Causes:

^ Water entry into the luggage compartment in several areas which leaks onto/into the Remote Keyless Entry (RKE) module. This creates an electrical short causing false alarm horns.

^ Electrical noise in the door ajar switch causes a signal to be sent to the RKE module. Water leakage into the door ajar switch produces corrosion and a short condition which activates the alarm system.

^ A hood switch that is positioned too low causes activation of the alarm system.

ACTION:
Determine if the alarm is a panic or anti-theft alarm. Follow diagnostics, replace RKE module and/or door hood switch, door ajar switch.

(B-2) - ANTI THEFT PROTECTION SYSTEM - ALARM SOUNDS IN ERROR - HOOD SWITCH POSITIONED TOO LOW - VEHICLES BUILT BEFORE 2/15/93 - 1993 MARK VIII

Article 93-19-6

ISSUE:
This article deals with the concern of false activation caused by a mispositioned hood switch.

ACTION:
Install a revised hood switch which allows for proper positioning on the sheet metal.

(B-3) - ANTI-THEFT PROTECTION SYSTEM - ALARM ACTIVATED IN ERROR - 1993 MARK VIII

Article 93-12-7

ISSUE:
The anti-theft protection system alarm may be activated in error because water may have entered the door ajar switch.

ACTION:
Install new door ajar switches which include double O-rings and improved lubrication to minimize water entry.

(B-4) - LOCK - TRUNK - BENT CYLINDER TAB FALSELY ACTIVATES ALARM - 1989-91 THUNDERBIRD, CONTINENTAL, MARK VII, TOWN CAR, COUGAR

Article 92-21-1

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 cylinder by using the service procedures as outlined in the article.

NOTE:
SERVICE PART HAS NOW BEEN REVISED TO F4VY-5443507-A.

(B-5) - ALARM SYSTEM - ANTI-THEFT SYSTEM DIAGNOSTIC PROCEDURE - VEHICLES BUILT AFTER 5/22/90 - 1990 THUNDERBIRD, COUGAR, TOWN CAR

Article 90-16-3

ISSUE:
An intermittent no crank condition may be caused by the anti-theft module. A new anti-theft module featuring additional diagnostic capabilities is now available for service. It has the ability to diagnose shorts in the door disarm circuit and the trunk lock cylinder circuit. It also can be used as a service replacement part for 1990 vehicles built prior to 5/22/90.

ACTION:
If service is required, install a new design level anti-theft module (F1VY-19A366-A). Use the procedures as outlined in the article to diagnose the Anti-Theft System. This procedure should be completed before continuing the diagnostic procedures provided in the Service Manual, Section 44-20, for the applicable vehicle.

(B-6) - ANTI-THEFT PROTECTION SYSTEM - ALARM SOUNDS INADVERTENTLY - HIGH RESISTANCE IN THE IGNITION TAMPER SWITCH CAUSES ACTIVATION - 1991-94 TOWN CAR (BUILT PRIOR TO 1/26/94), 1993-94 MARK VIII (BUILT PRIOR TO 1/26/94), 1992-94 ECONOLINE (1994 ECONOLINE BUILT PRIOR TO 9/7/93), 1994 F-SERIES (BUILT PRIOR TO 9/3/93)

ISSUE:
Vehicles may experience false activation of the anti-theft alarm, inadvertent activation with alarm system deactivated, or activation of the alarm system with the key in the ignition. If the condition occurs when the system is not activated, the cause is most likely in the ignition sensor to cylinder/housing contact area. Some vehicles may develop corrosion between the sensor and the cylinder housing which increases the resistance value of the sensor and activates the alarm.








ACTION:
We recommend, that in addition to correcting any problems found under normal diagnostics, you replace the Ignition Keylock Cylinder Sensor with the new "one-piece" design sensor, and clean the ignition keylock cylinder and Steering Column Housing surfaces (refer to Figures 1 and 2).

To begin the repair:

NOTE:
REFER TO THE SERVICE MANUAL FOR SERVICE PROCEDURES THAT APPLY TO YOUR SPECIFIC VEHICLE.

1. Disconnect the battery.

2. Follow the procedures in the appropriate Service Manual to remove the ignition key lock cylinder sensor.

3. Remove the sensor from the housing.

4. Cut the black ground wire (attached to the "OLD" sensor) that is fastened to the steering column housing underneath the clockspring assembly.

5. Clean the surface of the key lock cylinder groove where the sensor contacted the cylinder and clean the contact area of the steering column housing with a steel wool pad to provide clean surfaces for the new sensor.

6. Install a "NEW" ignition keylock cylinder sensor (see chart).

7. Reinstall the assemblies as outlined in the Service Manual.

8. Verify proper system operation.

NOTE:
1994 TOWN CARS BUILT AFTER 1/26/94 AND F-SERIES BUILT AFTER 9/7/94 DO NOT HAVE THE IGNITION KEYLOCK CYLINDER SENSOR. THEY USE A MODIFIED ANTI-THEFT MODULE WHICH IGNORES THE SENSOR. 1994 MARK VIII BUILT FROM 1/27/94 THROUGH 11/6/94 AND 1994 ECONOLINE BUILT FROM 9/8/94 THROUGH 11/13/94 DO NOT HAVE THE IGNITION KEYLOCK CYLINDER SENSOR. THEY USE A MODIFIED ANTI-THEFT MODULE WHICH IGNORES THE SENSOR.





Parts Block

(B-7) - 1994 F-SERIES/BRONCO - INADVERTENT ACTIVATION OF THE ANTI-THEFT SYSTEM

ISSUE:
Water intrusion into the Right or Left Front Courtesy Lamp Switch (refer to EVTM) of the Anti-Theft System may cause inadvertent activation of the system.

ACTION:
To correct this condition you should:
1. Remove the switch from the door.

2. Place a small amount of silicone sealant on the back of the connector where the wires exit the connector (enough sealant should be used to seal the connector and prevent further water intrusion).

3. Tape wrap the connector and about 1.5" (38 mm) of the wires beyond the switch connector.

4. Reinstall the switch.

5. Verify the repair.

(B-8) - 1993-94 "LIMITED" EXPLORER - INADVERTENT ACTIVATION OF THE ANTI-THEFT SYSTEM

ISSUE:
Vehicles built prior to 10/1/94 may have a concern with water entry into the area of the left rear quarter panel. Water can leak into the Anti-Theft Module and create inadvertent activation of the Anti-Theft Warning System, (lights flash and horn sounds) without ignition lockout.

ACTION:
To correct this condition, you should follow normal diagnostics as outlined in the appropriate Service Manual, Section 13-11. If the concern cannot be isolated, or diagnostics lead to replacement of the module, replace the Anti-Theft Module with part number F2VY-19A366-A for 1993 Model Year, and part number F4TZ-19A366-B for 1994 Model Year (these modules contain a water flap to resist water and prevent water intrusion).

PART NUMBER PART NAME CLASS
F2VY-19A366-A Anti-Theft Module (1993) B
F4TZ-19A366-B Anti-Theft Module (1994) C

(B-9) - 1995 EXPLORER/RANGER REPLACEMENT OF ANTI-THEFT IGNITION KEYLOCK CYLINDER SENSOR FOR 1995 EXPLORER BUILT PRIOR TO 10/2/94 AND 1995 RANGER BUILT PRIOR To 11/20/94

ISSUE:
Replacement of the anti-theft Ignition Keylock Cylinder Sensor on 1995 Explorer/Ranger may cause inadvertent alarm activations due to sensor circuit and ground circuits being reversed.

ACTION:

When the anti-theft Ignition Keylock Cylinder Sensor (F5TZ-19A438-A) is replaced for 1995 Explorers built prior to 10/2/94 and 1995 Rangers built prior to 11/20/94, ensure the Green/White wire of the sensor mates to the Green/White wire of the vehicle wiring harness and the Black/White wire of
the sensor mates to the Black/White wire of the harness. If the wires do not match, remove the wedge on the Ignition Keylock Cylinder Sensor, remove both wire terminals, and re-install wires to match.