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Recirculation Door Test Failure (Inoperative Or Stall)

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
NOTE: After repair or replacement is completed, calibration must be performed. See AUTOMATIC A/C-HEATER SYSTEMS - CONCORDE, INTREPID & 300M article in HVAC.

Monitored & Set Condition

  1. When Monitored: During HVAC motor calibration.
  2. Set Condition: The BCM is unable to detect the end of travel for one or more of the HVAC doors.

Possible Causes:

Testing

  1. Turn (press) the recirculation door switch off. With the scan tool, erase BCM DTC's. Turn ignition off. Disconnect the recirculation door actuator harness connector. See Figure . Measure the voltage of the common door driver circuit. Turn ignition ON. Turn (press) the recirculation switch on while observing the voltmeter. If the voltage is more than 9 volts for more than 6 seconds, go to next step. If the voltage is not more than 9 volts for more than 6 seconds, go to step  5 .
  2. With the scan too erase the BCM DTC's. Turn ignition off. Measure the voltage of the recirculation door driver circuit. Turn ignition on. Turn (press) the recirculation switch on then off while observing the voltmeter. If the voltage is more than 9 volts or more for more than 6 seconds, go to next step. If the voltage is more than 9 volts or less for more than 6 seconds, go to step  4 .
  3. If there are no possible causes remaining, replace the recirculation door actuator. See RECIRCULATION DOOR ACTUATOR  under REMOVAL & INSTALLATION.
  4. With the scan tool, erase BODY COMPUTER DTC's. Turn ignition OFF. Disconnect BCM C1 harness connector. See Figure . Backprobe one lead of a voltmeter to the recirculation door driver circuit in the BCM C1 connector and the other lead to ground. Reconnect the BCM C1 harness connector. Turn ignition ON. Turn (press) the recirculation switch on, wait 5 seconds then turn (press) the recirculate switch OFF while observing the voltmeter. If the voltmeter read 9 volts or more for 6 seconds, repair the recirculation door driver circuit for an open. If the voltmeter did not read 9 volts or more for 6 seconds, replace the BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION.
  5. Turn (press) the recirculation door switch off. With the scan tool, erase the BCM DTC's. Turn ignition off. Disconnect the recirculation door actuator harness connector. See Figure . Measure the voltage of the recirculation door driver circuit. Turn ignition on. Turn (press) the recirculation switch on then off while observing the voltmeter. If the voltage is more than 9 volts for more than 6 seconds, go to next step. If the voltage is not more than 9 volts for more than 6 seconds, go to next step.
  6. With the scan tool, erase BODY COMPUTER DTC's. Turn ignition off. Disconnect the BCM C1 harness connector. See Figure . Turn ignition on. Turn (press) the recirculation switch off, wait 5 seconds then turn (press) the recirculation switch on and observe the voltmeter. If the voltmeter read 9 volts or more for 6 seconds, repair the common door driver circuit for an open. If the voltmeter did not read 9 volts or more for 6 seconds, replace the BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION.
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