GM Service Manual Online
For 1990-2009 cars only

The ALC trimset can be recalibrated using a scan tool. Select Recalibration function from the scan tool menu. Although the ALC recalibration function is not under Special Functions, it is included with the rest of the information in the scan tool output controls table.

Scan Tool Output Control

Additional Menu Selection(s)

Description

ALC Compressor Relay

--

The RIM actuates, first the exhaust solenoid and then the compressor for 5 seconds. This prevents excessive residual over-pressure in the ALC system upon compressor engagement.

ALC Exhaust Solenoid

--

The RIM activates the exhaust solenoid for 5 seconds. The rear suspension should vent slightly.

ALC Trimset

Recalibration

Commands the recalibration of the ALC trimset.