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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting >> Diagnostic Information and Procedures >> Headlamps Flash to Pass Inoperative >> Circuit/System Description

Circuit/System Description

The high beam headlamps are controlled by the BCM through the high beam relay. The relay is supplied battery voltage and is energized when the BCM grounds the low side drive control circuit. The flash to pass switch signal circuit is referenced from battery voltage by the BCM and when the switch is activated the signal circuit is grounded, and the BCM determines the switch is active when the signal circuit voltage is low.

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