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RECIRC Door Not Responding

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn ignition switch to OFF position. Disconnect recirculation door actuator harness connector. Disconnect ATC module C1 connector. Check for short to ground in recirculation door driver "A" circuit. Using DVOM, measure resistance between ground and ATC module C1 connector terminal No. 6 (Dark Blue/Tan wire). See Figure. If reading is less than 100 k/ohms, repair short to ground in Dark Blue/Tan wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is 100 k/ohms or more, go to next step.
  2. Check for short to ground in recirculation door driver "B" circuit. Using DVOM, measure resistance between ground and ATC module C1 connector terminal No. 5 (Dark Blue/Yellow wire). See Figure. If reading is less than 100 k/ohms, repair short to ground in Dark Blue/Yellow wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is 100 k/ohms or more, go to next step.
  3. Check for short between recirculation door driver "A" and "B" circuits. Using DVOM, measure resistance between ATC module C1 connector terminals No. 5 (Dark Blue/Yellow wire) and No. 6 (Dark Blue/Tan wire). See Figure. If reading is less than 100 k/ohms, repair short between Dark Blue/Yellow wire and Dark Blue/Tan wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is 100 k/ohms or more, go to next step.
  4. Measure resistance in Dark Blue/Tan wire between recirculation door actuator harness connector and ATC module C1 connector terminal No. 6. See Figure. If reading is less than 5 ohms, go to next step. If readings is 5 ohms or more, repair open in Dark Blue/Tan wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
  5. Measure resistance in Dark Blue/Yellow wire between recirculation door actuator harness connector and ATC module C1 connector terminal No. 5. See Figure. If reading is less than 5 ohms, go to next step. If readings is 5 ohms or more, repair open in Dark Blue/Yellow wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
  6. Connect recirculation door actuator harness connector. Using DVOM, measure resistance between ATC module C1 connector terminals No. 5 (Dark Blue/Yellow wire) and No. 6 (Dark Blue/Tan wire). See Figure. If reading is 26-46 ohms, replace faulty ATC module. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING. If reading is not 26-46 ohms, go to next step.
  7. Replace faulty recirculation door actuator. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
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