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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Transfer Case - NVG 261-NP2 - Service & Troubleshooting) >> Diagnostic Information and Procedures >> Four-Wheel Drive Does Not Engage >> Circuit Description

Circuit Description

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The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle actuator consists of the following components within the actuator assembly:

The front axle actuator consists of the following circuits:

Whenever a shift to 4WD is selected, the transfer case switch engages the front axle by grounding the axle actuator control circuit.