Non-Networked Illumination Operation

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Based on the ambient light level input from the autolamp/sunload sensor and the requested illumination dimming level input from the dimmer switch, the BCM calculates the correct dimming level for the hardwired illumination sources. The BCM provides a pulse-width modulated voltage to all hardwired illumination sources on 1 circuit.

Component Description

Dimmer Switch

The dimmer switch is a momentary contact switch that is integral to the headlamp switch. The headlamp switch is hardwired to the BCM. When the dimmer switch is pressed up or down, the switch completes a ground circuit to the BCM corresponding to the desired action (increase or decrease illumination brightness).

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