Theft Deterrent System Inoperative
THEFT DETERRENT SYSTEM INOPERATIVEDIAGNOSTIC AIDS
The theft deterrent system can be armed either by pressing the Lock button on the remote coded key or by the body control module (BCM) arming it automatically 30 seconds after the ignition is switched OFF. For arming to take place, both the driver's door and the passenger's door must be closed. When the system is armed, the powertrain control module (PCM) prevents the engine from being started. The theft deterrent system can be disarmed by pressing the Unlock button on the remote coded key. This action unlocks both doors, turns on the interior lamp and disarms the system for 30 seconds, or opening the driver's door using the remote coded key and then inserting it into the ignition switch cylinder and turning the ignition to ON. This action permits the BCM to read the key's internal security code data via the remote coded key reader assembly. Reading the key data is achieved via the ignition switch slip ring contact. If the system does not disarm when the ignition switch is turned on, as recognized by the security warning light emitting diode (LED) being extinguished, the Theft Deterrent system can be disarmed by pressing either the Lock or Unlock buttons on the remote coded key. Such a situation may occur if a misaligned or faulty key is being used. The remote coded key is powered by its own internal battery. If the battery fails, the key reader circuitry within the ignition switch can provide power to the key when the key is inserted into the ignition cylinder and the ignition turned ON or it is turned to START.
When the Theft Deterrent system is armed by pressing the Lock button on the remote coded key, the external turn lamp indicators will flash once. From this point onward until the system is disarmed, the LED located within the instrument cluster will flash continually.
When the system is disarmed by pressing the Unlock button on the remote coded key, the turn indicators flash twice and the LED in the instrument cluster extinguishes.
When the ignition is turned to ON, the BCM then commences polling the PCM, via the powertrain interface module (PIM), for it to commence inspecting the remote coded-key security code. The key code is initially received directly from the key via the ignition switch slip ring, or remotely from the key via the remote key receiver. If the key is turned to the START position, initial engine cranking will commence, but the engine will not start until the key code has been verified by the PCM as being correct.
When the key code has been received from either the remote key receiver, or directly from the key via the BCM, the PCM then compares the received security code with its stored security code. If the 2 codes match, this then enables injector fuelling of the engine to commence. At this time, the PIM also sends an OK TO START message to the BCM.
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