On some 2015 ATS, CTS, XTS, Corvette, Colorado, Canyon, Silverado 1500, Sierra 1500; and 2015 Escalade, Silverado 2500/3500, Sierra 2500/3500, Tahoe, Suburban, and Yukon models with the 2015 mid-year RPO AVF, any of the following HVAC conditions may be present:

HVAC control panel is inoperative (does not light or respond as expected)
HVAC controls are stuck in an incorrect operating state (for example, regardless of the temperature setting, it only blows full cold air, or the blower may not respond, etc.)
A/C compressor is inoperative or does not follow commands
Recirculation is inoperative or does not follow commands
Rear defogger is inoperative or does not follow commands
Heated seats are inoperative or do not follow commands (applies to Cadillac and Corvette models only)

Battery Saver Message is on intermittently or flashing on and off
Any related HVAC DTCs are set: B0163 B0183 B1405 B0173 B0178 B0509 B0514 B0519 B3583 B3933 B0193 B0208 B0223 B0228 B0233 B0408 B0413 B0418 B0423 B0428 B0433 B1395 B3531 B374A B3782 B393B

If any of these conditions are present, reprogram the K33 HVAC Control Module with the updated calibration available in TIS2Web starting on January 17, 2015.

If the HVAC condition(s) are not corrected after reprogramming the HVAC Control Module, perform normal diagnostics following the appropriate Service Information.