Security Indicator Operation

The theft deterrent module (TDM) can command the body control module (BCM) to illuminate the security indicator only when the ignition key is in the ON position. If the powertrain control module (PCM) loses communication with the TDM, the BCM 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. A flashing indicator indicates unauthorized operation. Under the following conditions the security indicator may be commanded to illuminate or flash.

Security Indicator Stays Illuminated and Engine Starts 

If the TDM was unable to measure the ignition key transponder value or the PCM lost communication with the vehicle theft deterrent (VTD) system while the engine was last running, the indicator will remain illuminated during subsequent ignition cycles. This is to remind the driver that the VTD system will not be functioning until the problem is corrected.

Security Indicator Illuminates when Engine is Running 

If the TDM is unable to measure the ignition key transponder value or the PCM loses communication with the TDM while the engine is running, the security indicator will be illuminated.

Security Indicator Illuminated and Engine Does Not Start 

If the TDM was unable to measure the ignition key transponder value, the TDM VIN Check Timer is active, the PCM has detected a problem with the VTD system, or the VTD system is in Learn Mode. The security indicator will be illuminated

Security Indicator Flashes and Engine Does Not Start 

The TDM has measured an incorrect transponder value, the calculation to the challenge is incorrect, or the PCM has lost communication with the TDM. The VTD system considers this a tamper condition. The security indicator will flash.