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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Suspension >> Electronic Suspension >> Suspension Control System - Suspension Leveling >> Description and Operation >> Automatic Level Control Description and Operation >> Automatic Level Control (ALC) System Operation >> Self Pressure Test
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Self Pressure Test

Each time the ignition is turned ON the ESCM commands on the ALC relay, activating the compressor for 4 seconds. The ESCM then monitors the air pressure sensor's signal voltage to verify the compressor is functioning and the system is holding air pressure.

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