Grand Caravan AWD V6-3.8L VIN L (2001)
Control Assembly: Service and Repair
A/C Heater Control Calibration
The heater-A/C control module must be recalibrated each time an actuator motor or the control module is replaced. This is necessary so that the control
module can "learn" the feedback voltages for each actuator motor at both stop positions of each door in the front HVAC unit housing. If the vehicle is so
equipped, the calibration procedure also includes rear HVAC positions for each actuator motor.
1. Turn the ignition switch to the ON position.
2. Simultaneously depress and hold the Power and Recirculation buttons on the heater-A/C control for at least five seconds. The manual heater-A/C
control Delay 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 three minutes to complete for the manual heater-A/C control, and less than twenty 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 three minute (manual) or twenty 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 DRB III scan tool to perform further
diagnosis. Refer to the appropriate diagnostic information. 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 5 kilometers (3 miles).
