Auxiliary HVAC Control Module Reprogramming
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Isuzu Ascender, 2005 GMC Envoy XUV, 2005 GMC Envoy XL, 2005 GMC Envoy, and 2005 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Do not reprogram the auxiliary HVAC control module, unless directed by a service procedure, or a service bulletin.
Reprogram HVAC Control Module - Refer to Service Programming System (SPS) .