Vehicle Theft Deterrent (VTD) Description and Operation: Notes

The vehicle theft deterrent (VTD) system functions are provided by the body control module (BCM). When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the BCM supplies battery voltage to the theft deterrent exciter module. The transponder embedded in the head of the key is energized by the theft deterrent exciter module which is surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value, which is received by the theft deterrent exciter module. The BCM monitors the theft deterrent exciter module for the transponder value via the security system sensor signal circuit. The BCM then compares this value to a value stored in memory, learned key code. If the value is correct the BCM sends the fuel continue password via the serial data circuit to the powertrain control module (PCM). If the transponders value is incorrect the BCM will send the fuel disable password to the PCM via the serial data circuit. The components of the VTD system are as follows:

• Body control module (BCM)
• Theft deterrent exciter module
• Powertrain control module (PCM)
• Ignition key (Transponder)
• Ignition lock cylinder
• Security indicator