Hello, I hope the following is of assistance.
The Grand Vitara II is a permanent all wheel drive system and can't be switched to 2WD. It should have a switch that controls high and low gears and also the diff lock as shown below at number 17.
Attachments are only available to registered users.
If the 4WD is set in low gear then this will have an adverse effect on the vehicle when driven on the road. On the Vitara II there is no second gear lever.
I hope this helps but if I can assist further let me know and I'll reply as soon as I'm able to.