Manual Temperature Control

The BCM interfaces with the A/C-heater control head via hard-wired circuits. Information for the temperature setting is supplied to the BCM via a potentiometer. The rear defogger switch, A/C switch and the mode setting is supplied via a resistive multiplexed circuit. The system on/off status is supplied by a dedicated circuit. The BCM drives the A/C and rear defogger indicator lights via hard-wired circuit to the A/C-heater control head.