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Home >> Chevrolet >> 2017 >> SS Standard Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System >> Diagnostic Information and Procedures >> DTC B2625: Display Dimming Pulse Width Modulation Output Circuit >> Circuit/System Description

Circuit/System Description

The instrument panel dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The instrument panel dimmer 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 circuits to the instrument panel dimmer switch. When the instrument panel dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit to the BCM. The BCM interprets the signal and applies a pulse width modulated voltage through the LED backlight dimming control circuits illuminating the LED backlighting to the requested level of brightness. The backlighting for the switch indicators listed below are control by the Switch Indicator LED Backlight Dimming Control Terminal 5 X1.

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