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Mode Control Motor Testing

  1. Disconnect mode control motor 5-pin connector. Connect battery voltage to mode control motor terminal No. 1 and ground terminal No. 5. See Figure . If mode control motor does not run and stop at maximum vent position, reverse battery connections.
    NOTE: If mode control motor does not run, remove mode control motor. Check doors and linkage for smooth operation. If doors and linkage are okay, mode control motor must be replaced.
  2. Measure resistance between terminals No. 2 and No. 3. Resistance should be 4800-7200 ohms. Measure resistance between terminals No. 3 and No. 4. Resistance should be 960-1440 ohms at VENT position, and 3840-5760 ohms at defrost position. If resistance checks are not as specified, replace mode control motor.
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