Circuit/System Description

The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle engagement actuator 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 engagement actuator contains the following circuits:

• A Run/Crank Ignition 1 Voltage circuit
• A Four Wheel Drive Wheel Lock Indicator circuit
• An Front Axle Actuator Control circuit
• A ground circuit

When a shift to 4WD Auto, 4WD High or 4WD Low is requested, the transfer case control module engages the front axle by grounding the front axle actuator control circuit through a current limiting driver.