GM Service Manual Online
For 1990-2009 cars only

Functional Control Switch for GMC Truck GMC P52 RV/Van Chassis 1997

The ON and OFF position slide switch is located on the multifunction lever. It controls the electrical power to the cruise control system. When the switch is in the OFF position, the system cannot be engaged. When the switch is in the ON position, the system may be engaged by either the SET or RESUME switch at any speed above approximately 40 km/h (25 mph).