![]() ![]() ![]() The security icon is a visual indication that something in the car's antitheft system is failing. HO2S Low Reference (Denso Sensors) HO2S Low Signal (Delphi Sensors) Transmission Fluid Pressure Switch Signal C Transmission Fluid Pressure Switch Signal B The original image is sized 799x247 and weights 17KB. This is why the security light turns on and shuts down your vehicle. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The security light illuminates when that signal gets broken, even just for a second. If the key is in the ignition, then these parts are sending signals to each other. These 3 parts are in CONSTANT communication. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). In most GM cars and trucks there is a hidden system that most people are unaware even exists. The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. ![]()
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