To temporarily accelerate with the Cruise Control ON
Depress the accelerator pedal. When you take your foot off the accelerator, the vehicle will return to the previously set speed.
If you push the toggle switch down (SET-) at the increased speed, the Cruise Control will maintain the increased speed.
Cruise Control will be canceled when:

Information
Each of the above actions will cancel Cruise Control operation (the "SET" indicator in the instrument cluster will go off), but only pressing the CRUISE button will turn the system off. If you wish to resume Cruise Control operation, push the toggle switch up (RES+) located on your steering wheel. You will return to your previously preset speed, unless the system was turned off using the CRUISE button.
To increase Cruise Control speed Push the toggle switch up (RES+) and hold it, while monitoring the SET speed on the instrument cluster. The set speed will increase by 5 MPH (8 km/h) increments.
To resume preset Cruising speed Push the toggle switch up (RES+). If the vehicle speed is over 20 MPH (30 km/h), the vehicle will resume the preset speed.
Diagnosis With GDS 1. The heating, ventilation and air conditioning can be quickly diagnosed failed parts with vehicle diagnostic system (GDS). ※ The diagnostic system (GDS) provides the following information.
Description The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of heater core. The PTC heater is an electric heater using a PTC element as an auxiliary heating device that supplements deficiency of interior heat source in highly effective diesel engine.