Circuit/System Description
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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:
- A permanent magnetic motor
- A worm gear controlled plunger
- A front axle switch
- An electronic control circuit
The front axle actuator consists of the following circuits:
- An ignition 3 voltage circuit
- A ground circuit
- An axle actuator control circuit
- An axle switch signal circuit
Whenever a shift to 4WD is selected, the transfer case switch engages the front axle by grounding the axle actuator control circuit.