Mechanics

ALARM SYSTEM GOES OFF ON ITS OWN

2001 Ford Crown Victoria • 177,000 miles

Alarm goes off on its own tried disabling with key in lock, tried remote key system, dissconnected battery for about 10 minutes.
AD
Avatar
Skrimski
October 30, 2011.




DESCRIPTION
Passive Anti-Theft System (PATS) consists of the following components: PATS module, THEFT
indicator light, PATS transceiver module, encoded ignition key, module communications network and
Data Link Connector (DLC).
PATS vehicle protection system is designed to prevent driveaway thefts. The system is passive in that it
does not require any activity from the user. System uses radio frequency identification technology to
verify proper key is being used to attempt to start the vehicle.
During each starting sequence, the PATS transceiver module reads the encoded ignition key
identification code and sends the data to the PATS module. If the key's identification code is
programmed into anti-theft system, vehicle is allowed to start. If key's identification code is incorrect or
missing, vehicle is prevented from starting.
PATS module communicates with the Powertrain Control Module (PCM) through module
communication network. PCM then determines if engine will be enabled to start. If the PCM prevents
vehicle from starting because of PATS system, a Diagnostic Trouble Code (DTC) will be stored in
memory.
A scan will tell you which part is loosing it.

Merlin2021
Nov 3, 2011.


AD