GM Service Manual Online
For 1990-2009 cars only

Calibration Procedure

Use the following steps to perform the calibration update:

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select HVAC Control Module.
  4. Select Special Functions.
  5. Select recalibrate All Motors.
  6. Select ON, wait 60 seconds.