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Description The ECM (Electro Chromatic inside rear view Mirror) automatically dims when it senses light reflecting in the rear view mirror. The forward facing sensor detects brightness of the surroundings, while the rearward looking sensor is for the light from the rear.
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Inspection 1. Turn the ignition switch OFF. 2. Disconnect the auto defogging connector. 3. Verify that the auto defogging actuator operates to the open position when connecting 12V to terminal 3 and grounding terminal 4. Verify that the auto defogging actuator operates to the close position when connected in reverse.