Yes the Hi - Lo actuator is mounted on the rear end of the case. You can't miss it, an electric motor feeding into a right angle drive, the drive is the actual actuator, the motor supplies the power. A fault could be the motor, the drive, the wiring, or the ECU.
I just had a look under my car a 2003 with part time 4WD, and my front prop shaft just has ordinary U joints at both ends. I presume that the TOD units use a CV joint for durability because the shaft would be always turning, unlike a part time unit? Still the front diff doesn't move with the suspension like in a solid axle so I wonder why they bothered.
Last edited by cmar; 01-16-2013 at 04:25 PM.