Security Lamp/Indicator: Description and Operation

SECURITY INDICATOR (IMMOBILIZER SYSTEM)

The SECURITY indicator on the instrument cluster is controlled by the VTD system. The SECURITY indicator is located inside the instrument cluster. The SECURITY indicator is controlled by the body control module through the class 2 data line. The VTD system contained in the BCM commands the instrument cluster to control the SECURITY indicator only when the ignition switch is ON. The VTD system uses the indicator as a malfunction indicator.

The IPC illuminates the theft deterrent indicator as determined by the theft deterrent system. The IPC receives a class 2 message from the BCM requesting illumination.
- The vehicle theft deterrent (VTD) system requests the IPC to illuminate the indicator only when the ignition switch is ON.
- The content theft deterrent (CTD) system requests the IPC to illuminate the indicator only when the ignition switch is in the OFF or ACC positions or during RAP.
- The body control module performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds

The instrument panel cluster (IPC) illuminates the SECURITY indicator as determined by the vehicle theft deterrent (VTD) system. The IPC receives a message via the serial data circuit from the theft deterrent control module requesting illumination. The VTD system requests the IPC to illuminate the indicator only when the ignition is ON. The VTD system uses the indicator as a malfunction indicator.


SECURITY Indicator Operation
The theft deterrent control module can command the instrument cluster to illuminate the SECURITY indicator only when the ignition key is in the ON position. If the PCM loses communication with the theft deterrent control module, the instrument cluster will also detect the loss of communication and will illuminate the SECURITY indicator. The SECURITY indicator can indicate both malfunctions (Indicator on steady) and tamper (Indicator flashing - indicating unauthorized operation). Under the following conditions the SECURITY indicator may be commanded to illuminate. SECURITY Indicator Stays Illuminated and Engine Starts If the theft deterrent control module was unable to measure the ignition key transponder value or the PCM lost communication with the theft deterrent control module while the engine was last running, the indicator will remain illuminated during subsequent ignition cycles. This is to remind the driver that the vehicle theft deterrent system will not be functioning until the problem is corrected.

SECURITY Indicator Illuminates when Engine is Running
If the theft deterrent control module is unable to measure the ignition key transponder value or the PCM loses communication with the theft deterrent control module while the engine is running, the indicator will be illuminated.

SECURITY Indicator Illuminated and Engine Does Not Start
The theft deterrent control module or the PCM has detected a problem with the theft deterrent system. The theft deterrent control module is unable to measure the ignition key transponder value. The System is in Learn Mode. Refer to Programming Theft Deterrent System Components. Theft Deterrent - Programming Components - Immobilizer

SECURITY Indicator Flashes and Engine Does Not Start
The theft deterrent control module has measured an incorrect transponder value when the ignition key is turned to the ON position. The transponder has not been learned by the theft deterrent control module. This is considered a tamper condition by the theft deterrent control module.