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Rear Blend Door Not Responding

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn ignition switch to OFF position. Disconnect rear blend door actuator harness connector. Disconnect ATC module C1 connector. Check for short to ground in rear blend door driver "A" circuit. Using DVOM, measure resistance between ground and ATC module C1 connector terminal No. 11 (Light Blue/Yellow wire). See Figure. If reading is less than 100 k/ohms, repair short to ground in Light 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.
  2. Check for short to ground in rear blend door driver "B" circuit. Using DVOM, measure resistance between ground and ATC module C1 connector terminal No. 12 (Dark Blue/Orange wire). See Figure. If reading is less than 100 k/ohms, repair short to ground in Dark Blue/Orange 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 rear blend door driver "A" and "B" circuits. Using DVOM, measure resistance between ATC module C1 connector terminals No. 11 (Light Blue/Yellow wire) and No. 12 (Dark Blue/Orange wire). See Figure. If reading is less than 100 k/ohms, repair short between Light Blue/Yellow wire and Dark Blue/Orange 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 Light Blue/Yellow wire between rear blend door actuator harness connector and ATC module C1 connector terminal No. 11. See Figure. If reading is less than 5 ohms, go to next step. If readings is 5 ohms or more, repair open in Light Blue/Yellow wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
  5. Measure resistance in Dark Blue/Orange wire between rear blend door actuator harness connector and ATC module C1 connector terminal No. 12. 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/Orange wire. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
  6. Connect rear blend door actuator harness connector. Using DVOM, measure resistance between ATC module C1 connector terminals No. 12 (Dark Blue/Orange wire) and No. 11 (Light Blue/Yellow 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 rear blend door actuator. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
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