A method for the coordinated control of mechanical, electrical and thermal power flows in a motor vehicle for bringing about optimum operating states of units in the motor vehicle, and a device for carrying out the method. The portable computer system has a main processor and a DSP. The power control circuit is configured to automatically electrically connect the battery power source to the power conditioner in response to activation of any of the plurality of input keys, and in the absence of an electrical connection between the external power source and the power conditioner. A bias current and voltage may be provided to the LED during an inactive portion of the duty cycle of the PWM enable signal. Also provided herein are vectors and host cells comprising those nucleic acid sequences, chimeric polypeptide molecules comprising the polypeptides of the present invention fused to heterologous polypeptide sequences, antibodies which bind to the polypeptides of the present invention and to methods for producing the polypeptides of the present invention. A sealant is filled in the case to cover the electric circuit elements and the substrate and is composed of a lower layer gel and an upper layer gel formed in a two-layer structure.