Circuit/System Description
WARNING: This page is about a different car, the 2014 GMC Yukon XL 1500, 2014 GMC Yukon, 2014 Chevrolet Tahoe, and 2014 Chevrolet Suburban 1500. 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 motor consists of a permanent magnetic motor, a worm gear controlled plunger, a front axle switch and an electronic control circuit within the actuator assembly.
The front axle actuator consists of the following circuits:
- An Ignition 1 voltage circuit
- An axle switch signal circuit
- An axle actuator control circuit
- A ground circuit
When a shift to 4WD Auto, 4WD HI, or 4WD LO is requested, the transfer case shift control module (TCCM) engages the front axle by grounding the front axle control circuit through a current limiting driver.