Body Control Module (BCM)

The BCM  is used to calculate the illumination dimming level for all illumination sources. The illumination voltage circuit from the BCM  is protected by a Field Effect Transistor (FET). This is used to turn the output off to protect the BCM  from damage in the event that an excessive current draw is detected on the illumination voltage circuit. For a full description of Field Effect Transistor (FET) protection,

Refer to: MODULE CONTROLLED FUNCTIONS - SYSTEM OPERATION AND COMPONENT DESCRIPTION .