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A/C Control Module Calibration

  1. Turn ignition switch to ON position.
  2. Simultaneously depress and hold power (PWR) button and recirculation button of front control panel for 5 seconds, then release. The manual heater A/C control power Light Emitting Diode (LED) and Recirculation LED, or the Automatic Temperature Control (ATC) heater A/C control Delay and Recirculation graphics will begin to flash when the calibration procedure has begun.
  3. The calibration procedure should take less than 2 minutes to complete for the manual heater A/C control, and less than 20 seconds for the ATC heater A/C control. When the LEDs or graphics stop flashing, the calibration procedure is complete.
  4. If the LEDs or graphics continue to flash beyond the normal 3 minute (manual) or 20 second (ATC) calibration time, it indicates that the heater A/C control has detected a failure and a Diagnostic Trouble Code (DTC) has been set. Use a DRBIII(R) scan tool to perform further diagnosis. The LEDs or graphics will continue to flash even after the ignition switch is cycled OFF and ON, until a successful calibration is completed or until the vehicle has been driven about 8 miles (13 kilometers).
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