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Home >> GMC >> 1999 >> Envoy >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Analog >> Operation >> Indicator Lights >> Security

Indicator Lights: Security

Light Emitting Diode (LED) is controlled by Instrument Panel Cluster (IPC), using Class 2 data from Body Control Module (BCM). As a check, LED illuminates briefly when key is turned to run, until engine starts. If LED flashes, system has entered a tamper mode. If LED stays on while driving, system malfunction exists and vehicle will not be protected by security system. A system related DTC may be stored.