Manual A/C (HVAC/Rear Window Defogger

The Prowler comes standard with manual air conditioning. The actuators for blend-air and fresh/recirc are cable operated. The mode door is electrically activated by the BCM based on input from the HVAC control head. The BCM uses an electronic cycling switch to prevent evaporator freeze-up.

When the ignition is in the "run" position, the body control (BCM) monitors the electronic cycling switch state and the status of the A/C switch. Based on this information, the BCM sends a CCD message to the powertrain control module (PCM) indicating the A/C switch status and the electronic cycling switch state.

The body control module controls the mode door position by receiving different voltage levels from the HVAC control over the A/C mode switch MUX circuit. Included in this signal is the input for the rear window defogger. The Rear Window Defogger button is located in the center of the Mode Control knob. Press this button once to turn on the Rear Window Defogger and a second time to turn it off. A LED in the button shows that the defogger is on. The defogger turns off automatically after 10 minutes of operation. Each later activation will allow 5 minutes of operation. The timer functions for the rear window defogger are controlled by the BCM.