A/C Compressor Control

The Powertrain Control Module (PCM) and the BCM share hardware and software for control of the A/C Compressor Clutch. The PCM and the BCM communicate this information over the serial data class 2 line.

The BCM performs the following software functions:
^ Limits low speed compressor operation
^ Prevents clutch slippage
^ High coolant temperature
^ Monitors for overpressure
^ Determines low ambient pressure
^ Controls the compressor clutch The PCM performs the following functions:
^ Prevents compressor overspeed
^ Limits compressor speed (in PARK or NEUTRAL)
^ Drives the compressor clutch
^ Performs anti-slug
Slugging is when a mass of liquid enters the A/C compressor pump