GrandCaravan 2008

Reset Procedure


The A/C-heater control module must be recalibrated each time an actuator motor or the A/C-heater control is replaced. If the vehicle is so equipped, the calibration procedure also includes the rear HVAC positions for each actuator motor.

Calibrate the A/C-heater control with the following procedure:

  1. Before servicing the vehicle, refer to the Precautions Section.
  3. Turn the ignition switch to the ON position.
  5. If equipped with the Manual Temperature Control (MTC) system, press and hold the Rear Wipe/Wash and Recirculation buttons for at least 5 seconds.
  7. If equipped with the Automatic Temperature Control (ATC) system, simultaneously press and hold the Power and Recirculation buttons on the A/C-heater control for at least 5 seconds.
  9. The MTC A/C-heater control Rear Wipe/Wash button Light Emitting Diode (LED) and Recirculation button LED, or the ATC A/C-heater control Delay and Recirculation graphics, will begin to flash when the calibration procedure has begun.
  11. The calibration procedure should take less than 2 minutes to complete for the MTC A/C-heater control, and less than 20 seconds for the ATC A/C-heater control. When the LED-s or graphics stop flashing, the calibration procedure is complete.
  13. If the LED-s or graphics continue to flash beyond the 2 minute (manual) or 20 second (ATC) calibration time, this indicates that the A/C-heater control has detected a failure and a Diagnostic Trouble Code (DTC) has been set.
    The LED-s 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 km).