It engages the 4 wheel drive system on the car.
What it actually does to accomplish this can be very complicated and changes from car to car.
pics of 1992 4runner ignition switch
The brake pedal electrical switch can be found below the dashboard in the passenger compartment. The switch will be on the drivers side of the dashboard.
The 1995 when can Mark VIII cooling fan switch is located behind the dashboard. The switch will be on the passenger side of the dashboard in the passenger compartment.
Either turn the dashboard switch or move the transfer case lever to "4-High", and off you go
Chevrolet Tahoe rear blower relay switch can be found behind the dashboard. The relay switch will be behind the drivers side dashboard.
The 1996 Buick Century horn relay switch is located behind the dashboard. The relay switch will be on the drivers side of the dashboard.
The repair section on autozone.com explains how to change the light switch.
how do you replace3 dimmer switch 1987 chevy silverado 4 x 4
It depends on the vehicle and if it actually has 4 wheel drive. Some vehicles have it on the dashboard while some have it on the floor of the vehicle
On the dashboard
on the dashboard
The indicator light switch in a car's dashboard is used to signal to other drivers when the driver intends to change lanes or make a turn.