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Driver Blend Door Travel Too Small

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn ignition switch to ON position. With the DRB, read the active ATC DTC's. If DRIVER BLEND DOOR NOT RESPONDING DTC message is actively set in ATC module, see DRIVER BLEND DOOR NOT RESPONDING . If DRIVER BLEND DOOR NOT RESPONDING DTC message was not actively set, go to next step.
  2. Turn ignition switch to OFF position. Disconnect suspect door actuator harness connector. Connect a test light between terminals of suspect door actuator harness connector. Turn ignition switch to ON position. While monitoring test light, actuate suspect door actuator from appropriate switch or selector at ATC control panel or rear zone control panel. Test light should flash for about 20-30 seconds when actuated. If test light starts to flash and stays flashing, go to next step. If test light does not flash, or does not stay flashing, replace ATC module. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
  3. Check mechanical operation and travel of door for removed actuator. Ensure door travels smoothly and through full range of motion. Check for binding, worn, missing or broken actuator gear and actuator-to-door linkages. Repair any mechanical faults that exist as necessary. If door and actuator-to-door linkage are okay, replace door actuator motor. Calibrate ATC module and actuators. See HVAC CONTROL CALIBRATION  under PROGRAMMING.
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