Conditions for Enabling Cruise Control

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle speed is greater than 40 km/h (25 mph).
The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear.
The system voltage is within 9-16 volts.
The park brake or brakes is not applied.