Load Management Control Mode

When the HVAC controller has a request for rear window defog at idle, the HVAC controller sends a message via UART Serial Data to the PCM to increase the desired idle speed. The changes to desired idle speed are as follows. At idle in park/neutral desired idle speed will be at least 1040 RPM. When a gear other than park or neutral is selected, the desired idle speed will be at least 704 RPM.