Try this first to see if any codes are stored for the HVAC. ENTERING SELF-DIAGNOSTICS 1. To enter diagnostic mode, turn ignition switch to ON position. Press OFF and WARMER buttons on control panel simultaneously. Hold buttons until all control panel segments illuminate. Ensure all segments illuminate. This indicates beginning of diagnostic readout. See Fig. 3 . 2. After entering self-diagnostic mode, any trouble codes stored in computer memory will be displayed. If trouble codes are present, they will be displayed on control panel. Fig. 3: Self-Diagnostic Basic Operation Courtesy of GENERAL MOTORS CORP. CLEARING TROUBLE CODES Trouble codes can be cleared by entering self-diagnostic mode. Press OFF and LO buttons on control panel simultaneously and hold buttons until "00" appears. See Fig. 4 . NOTE: If any control panel segments do not illuminate after entering self- diagnostics, replace control panel. The Power module is on the evap case under the hood.
Jan 28, 2010 at 2:13 PM
