GM Service Manual Online
For 1990-2009 cars only

Scan Tool Output Control

Additional Menu Selection(s)

Description

A/C Compressor

Engine Output Controls

Activates the A/C compressor clutch relay and cooling fan 1 relay. The normal commanded state of both relays is NONE. The A/C compressor relay status can be monitored on the scan tool data parameter A/C Relay Command. The PCM allows relay control when the following conditions are met:

    • The ignition is ON or the engine is running
    • The blower motor select switch is ON
    • The powertrain control module (PCM) will inhibit the operation of the A/C relay when the ambient air temperature low enough to cause icing of the evaporator core.