Vehicle climate control multiplex system

A vehicle climate control system, comprising:

• a selector for selecting from a plurality of climate control modes of operation, said selector having means for producing an analog control signal, said means including a voltage divider comprising a plurality of discrete resistors, the resistance of each of said resistors defining a selection of a respective mode of air distribution of said plurality of climate control modes of operation such that said analog control signal has a selectively variable voltage value indicating a selected mode of air distribution;
• a control module coupled to said selector by a single wire interconnect between said selector and said control module, said control module having means for receiving said analog control signal and for producing a set of digital signals that define the selected mode of air distribution;
• a power source coupled to said selector and said control module, respectively;
• said resistors having one of their ends respectively coupled to a common terminal;
• said selector further comprising a switch for selectively coupling said power source to said common terminal through one of said resistors, said resistor attenuating the voltage of a signal produced by said power source to thereby produce said analog control signal;
• and
• a normally open switch coupled between said power source and said common terminal in parallel with said resistors, said normally open switch being selectively closed to produce a control signal having a constant voltage equal to the voltage value associated with said common terminal.