Abstract: A vehicle includes a communication unit for communicating with a wireless device including a selection portion and a command portion. The selection portion provides an interface for a user to select functions of the vehicle for control by the wireless device. The command portion of the communication unit receives user input from the selection portion. The command portion includes a controller that accepts the user input from the selection portion and generates the wireless communications to the wireless device. The wireless communications enable the wireless device to communicate with the command portion, which then controls the desired vehicle function.

Abstract: A pulse width modulation circuit includes a transistor pass element alternately switched on and off by an oscillator and connecting a power source to a load. Current through the transistor pass element is compared to a reference signal by a comparator. If the current through the transistor pass element exceeds the reference signal, the comparator generates a fault signal, and the transistor pass element is switched off for the remainder of the cycle. After a predetermined number of faults, the transistor pass element is switched off for a plurality of cycles. The pulse width modulation circuit prevents damage to the transistor pass element caused by the low initial resistance of the load and supplies sufficient current to slowly heat the load to steady state operation. This also allows for downsizing of the pass element for steady state conditions thereby saving product cost.