Normal Operation

The axle disconnect controller is driven by the signal from TOD control unit and the axle motor actuator connects (or disconnects when the 4WD switch is deactivated) the front wheels to the front axles.

Time Chart of Shifting Under Normal Condition 

Fig 1: TOD Switch Shifting Timing Chart (Under Normal Condition)

Courtesy of ISUZU MOTOR CO.

4WD out signal to other Electronic Brake Control Module:  TOD Control Unit of shift on the fly sends 4WD out signal to other Electronic Brake Control Module as below.