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Home >> Chevrolet >> 2018 >> Traverse LS, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Description

Circuit/System Description

The headlamp switch is used to increase and decrease the brightness of the interior backlighting components. The headlamp switch provides a voltage signal to the body control module (BCM) that will increase as the brightness of the lights are increased and decrease as the brightness of the lights are decreased. The BCM provides a low reference, signal, and B+ voltage reference to the headlamp switch. When the headlamp switch is placed in the desired position, the dimmed voltage setting is applied from the headlamp switch through the headlamp switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated voltage through the LED dimming 1 and dimming 2 control circuits illuminating the interior backlighting to the requested level of brightness. The BCM also sends a serial data message to the following components requesting there backlighting be adjusted to the level selected by the instrument panel dimmer switch:

The backlighting for the switch indicators listed below are controlled by the Switch Indicator LED Backlight Dimming Control Terminal 5 X1.

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