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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1348 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC B0785 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The 2 high indicator circuit consists of a light emitting diode (LED), a LED feed circuit and a LED control circuit. The indicator dimming control circuit is the LED feed circuit and continuously supplies voltage to the 2 High, Auto 4WD, 4 Low and 4 High LEDs. When the 2 High mode has been selected, the transfer case shift control module (TCCM) provides a ground through the 2 high indicator control circuit illuminating the LED. At key ON, the TCCM will illuminate and test each mode indicator for 2 seconds.

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