GM Service Manual Online
For 1990-2009 cars only

Each of the following service procedures may require programming or setup procedures to be performed on the HVAC control module or HVAC actuators.

HVAC Control Module Replacement

If the HVAC control module is replaced it must be programmed with the latest operating software and vehicle calibrations. Refer to Service Programming System (SPS) .

HVAC Control Module Reprogramming

Do not reprogram the HVAC control module, unless directed by a service procedure, or a service bulletin.

Reprogram HVAC Control Module--Refer to Service Programming System (SPS) .