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Alternate Method (w/o Scan Tool)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear all DTCs
  2. Place the ignition switch to the OFF position.
  3. Disconnect the scan tool.
  4. Install the motor assembly.
  5. Re-connect all previously disconnected components.
  6. Remove the HVAC/ECAS fuse for a minimum of 10 seconds.
  7. Re-install the HVAC/ECAS fuse.
  8. Start the vehicle.
  9. Wait 40 seconds for the HVAC control module to re-calibrate.
  10. Verify that no DTCs have set as current DTCs.
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