Mechanics

THEFT SYSTEM, CAR ALARM

1997 Ford Thunderbird

Electrical problem
1997 Ford Thunderbird 6 cyl Two Wheel Drive Automatic

Hey there, I have a 97 Ford Thunderbird. I bought it used. Every once in a while an alarm will go off (Horn and lights flashing) even though I have been told that there isn't a factory alarm on these cars. It will usally go off when you unlock and open the door. To get it to turn off you have to shut and lock the door back several times for it to start working again. Some times it goes off even when no one touches it. I have to disconect the battery some times. The " THEFT" light is always on and flashes some times. Even when you lock the door and shut it it stays on. I didnt know if there was a aftermarket alarm on these that I can remove, or if its like a theft module going out? And if it is how to I replace it? Thanks
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Thewingnut13
January 16, 2009.




Hello ..thanks for the donation .. much appreciated..

Hope this helps .. let me know if you need any more information !!

OPERATION
ARMING & DISARMING OF ANTI-THEFT SYSTEM
Arming Anti-Theft System
Use the following sequence to arm the anti-theft system. Turn ignition switch to the OFF position. Open a door and ensure alarm indicator light on instrument panel flashes. Alarm indicator light is located on instrument panel, just below the engine coolant temperature gauge. Lock doors using power door locks or by depressing LOCK button on remote keyless entry transmitter. Close all doors. Wait approximately 30 seconds for alarm indicator light to turn off to indicate the system is armed.
Disarming An Untriggered Anti-Theft System
System may be disarmed by unlocking the driver's or passenger's door with the key or using remote keyless entry transmitter to unlock the door. If remaining inside the vehicle, turn ignition switch to ON or ACC position to disarm the system.

Triggering Anti-Theft System
The horn will sound, low-beam headlights will flash, park lights will flash, alarm indicator light on instrument panel will flash and starter is disabled if any of the following trigger the system:
Any door is opened without first unlocking the door with key or remote keyless entry transmitter.
Trunk lock cylinder is tampered with or removed.
Ignition switch is tampered with. This will trigger the system even if the system is not armed.
PANIC button on remote keyless entry transmitter is depressed. The starter will not be disabled when panic button is depressed.
Within 2-3 minutes after the system is triggered, the horn and lights will shut off automatically. Anti-theft system will then reset to an armed state and will trigger again if another intrusion occurs. Vehicle starting system will remain disabled until system is disarmed.
Disarming A Triggered Anti-Theft System
System may be disarmed by unlocking the driver's or passenger's door with the key or using remote keyless entry transmitter to unlock the driver's door.
SELF-DIAGNOSTIC SYSTEM
SELF-DIAGNOSTICS
The anti-theft controller module contains a self-diagnostic system which may store a Diagnostic Trouble Code (DTC) if a problem exists in the anti-theft disarm switch on door lock cylinder, trunk lock tamper switch and anti-theft ignition sensor on ignition switch. DTC may be retrieved from anti-theft controller module and then be used to indicate the possible problem area for system diagnosis. Before retrieving DTCs from anti-theft controller module, perform preliminary inspection procedure.
PRELIMINARY INSPECTION
Verify customer's complaint and operate anti-theft system to duplicate the condition. Check for loose or damaged trunk lock tamper switch and disconnected wiring at trunk lock tamper switch. Trunk lock tamper switch is incorporated into the trunk lock cylinder for the trunk.
If trunk lock tamper switch is not loose, damaged and no disconnected wiring exists, go to next step. If trunk lock tamper switch is loose, damaged or wiring is disconnected, repair as necessary.
Check for defective horn fuse No. 10 (15-amp) in power distribution box. Power distribution box is located at driver's side front corner of engine compartment, near radiator coolant reservoir. Replace fuse if defective. Go to next step.
Check for defective seat/lock fuse No. 10 (20-amp), ACC fuse No. 27 (10-amp) and instrument panel light fuse No. 4 (10-amp) fuse in primary junction block. Primary junction block is located below driver's side of instrument panel, just to the left of the steering column. Replace fuse if defective. Go to next step.
Check for defective park light and anti-theft controller module in-line fuses at anti-theft controller module. Anti-theft controller module is located in the trunk, behind panel cover on driver's side fender. See Fig. 1 . In-line fuses are Black colored and located near front of anti-theft controller module. Fuse for anti-theft controller module is a 20-amp fuse and fuse for park light is a 10-amp fuse. Replace fuse if defective. Go to next step.
Check for any loose or corroded connections at anti-theft controller module and remote keyless entry module. Remote keyless entry module is located near anti-theft controller module. See Fig. 1 . Repair connections if loose or corroded. Proceed to RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM.
Fig. 1: Locating Anti-Theft Controller Module & Remote Keyless Entry Module
Courtesy of FORD MOTOR CO.
RETRIEVING DIAGNOSTIC TROUBLE CODES
Ensure preliminary inspection procedure is performed before proceeding. See PRELIMINARY INSPECTION under SELF-DIAGNOSTIC SYSTEM.
Diagnostic Trouble Code (DTC) may exist if a problem exists in the anti-theft disarm switches on door lock cylinders, trunk lock tamper switch and anti-theft ignition sensor. To retrieve DTCs from anti-theft controller module, turn ignition switch to ON position.
If alarm indicator light does not come on and remain on steady for 10 seconds, go to step 5). If alarm indicator light comes on and remains on steady for 10 seconds, go to next step.
Check anti-theft ignition sensor on ignition switch and Dark Green/White wire between anti-theft ignition sensor and anti-theft controller module. Anti-theft ignition sensor provides ground circuit to anti-theft controller module to indicate ignition switch has been tampered with. Anti-theft ignition sensor is located on side of ignition switch. See Fig. 2 . Anti-theft controller module is located in the trunk, behind panel cover on driver's side fender. See Fig. 1 .
Operate power door unlock button 5 times within 10 seconds to enter output test mode on anti-theft controller module. Count number of times that alarm indicator light on instrument panel flashes. The flashing will repeat every 10 seconds.
If alarm indicator light flashes only one time (DTC No. 1), input signals from anti-theft disarm switches on door lock cylinders and trunk lock tamper switch are operating properly. Proceed to SYMPTOM TESTS for testing by specified symptom.
If alarm indicator light flashes 2 times (DTC No. 2), input signal from anti-theft disarm switch on door lock cylinder to the anti-theft controller module is shorted. Go to next step.
NOTE:Anti-theft disarm switch may also be referred to as door lock cylinder switch.

Check for defective anti-theft disarm switch on each door lock cylinder and for a short circuit on Dark Green/Purple wire between anti-theft disarm switch on each door lock cylinder and anti-theft controller module. Anti-theft disarm switch is located on door lock cylinder. See Fig. 3 . Anti-theft controller module is located in the trunk, behind panel cover on driver's side fender. See Fig. 1 .
If alarm indicator light flashes 3 times (DTC No. 3), input signal from trunk lock tamper switch to anti-theft controller module is shorted. Go to next step.
Check for defective trunk lock tamper switch and for a short circuit on Brown/White wire between trunk lock tamper switch and anti-theft controller module. Trunk lock tamper switch is incorporated into the trunk lock cylinder. Anti-theft controller module is located in the trunk, behind panel cover on driver's side fender. See Fig. 1 .
If alarm indicator light flashes 4 times (DTC No. 4), input signals from anti-theft disarm switch on door lock cylinder and trunk lock tamper switch to anti-theft controller module are shorted. Go to next step.
Check for defective anti-theft disarm switch on each door lock cylinder and for a short circuit on Dark Green/Purple wire between anti-theft disarm switch on each door lock cylinder and anti-theft controller module. Check for defective trunk lock tamper switch and for a short circuit on Brown/White wire between trunk lock tamper switch and anti-theft controller module. Anti-theft disarm switch is located on door lock cylinder. See Fig. 3 . Trunk lock tamper switch is incorporated into the trunk lock cylinder. Anti-theft controller module is located in the trunk, behind panel cover on driver's side fender. See Fig. 1 .


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Dave H
Jan 16, 2009.


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