2H Operation

2H Mode delivers power to the to the rear wheels only. This mode is appropriate for normal on-road driving on dry pavement and provides the best fuel economy. Torque is passed through the transfer case to the rear drive shaft at a 1:1 ratio. In 2H:

The 4x4 Switch Module sends a 2H mode status to the TCCM via HS2 CAN (4x4_SW = 2H).
The TCCM provides a ground for the IWE solenoid (IWE_OUT_ENGAGED # = No).
The TCCM outputs a 0% duty cycle to the clutch field coil (4WD_CLUTCH_OUTPUT # = 0.00%).
The shift motor is in the full CCW position. Refer to TRANSFER CASE SHIFT MOTOR STATUS in this service information for further information.
2H will momentarily be displayed in the message center at key up and after a 4A to 2H shift.

NOTE: When shifting to 2H mode in order for the IWEs to completely disengage the vehicle steering wheel must be less than 90 deg and 5 seconds have elapsed since the shift to 2H has been initiated.