GM Service Manual Online
For 1990-2009 cars only

Calibration Procedure

Use the following steps to perform the calibration update:

  1. Turn OFF the ignition.
  2. Remove the battery positive voltage circuit fuse of the HVAC Control Module.
  3. Important: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.

  4. Wait 60 seconds.
  5. Install the fuse.