• Based on a signal from the 4WD CM, it operates the electromagnetic clutch and transmits drive torque to the rear wheels.

• Informs the 4WD CM of the rear differential oil temperature.

• Controls operation of the electronic control coupling (4WD solenoid) based on signals input from the accelerator pedal opening angle, wheel speed, differential oil temperature and other sensors.

• Outputs coupling control condition and 4WD warning control information as a CAN signal.

• Controls the on-board diagnostic system and the fail-safe system if there is a malfunction in the 4WD system.

• Illuminates or flashes to alert driver of a malfunction or control failure in the 4WD system.

• Sends the accelerator pedal position, engine speed signal and other signals, as CAN signals, to the 4WD CM.

• Sends the selector lever position signal, as CAN signal, to the 4WD CM.

• Sends the steering wheel angle signal, as CAN signal, to the 4WD CM. (MTX)

• Sends the four-wheel speed, DSC operating condition signal and other signals, as CAN signals, to the 4WD CM.

• Sends the coupling torque request signal, as a CAN signal, to the 4WD CM.

• Sends the parking brake switch signal, as CAN signal, to the 4WD CM.