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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC B0780 >> Circuit/System Description

Circuit/System Description

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The 4 low indicator circuit consists of an interior lights dimming circuit and an 4 low indicator lamp control circuit. When the 4 low mode has been selected, current is supplied to the 4 low indicator lamp by the interior lights dimming circuit, traveling through the 4 low indicator lamp LED, at which time the transfer case shift control module supplies the ground through the 4 low indicator lamp control circuit.

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