ELECTROCHROMIC Inside Rear View Mirror: Inspection

Check it by the procedure below to see if the function of the ECM is normal

1. Turn the ignition key to the "ON" position
2. Cover the front looking sensor to stop functioning
3. Head a light to the rearward looking sensor
4. The ECM should be darkened as soon as the rear-ward looking sensor detects the light.
   NOTE: If this test is performed in daytime, the ECM maybe darkened as soon as the front looking sensor is covered.
5. When the reverse gear is engaged, the ECM should not be darkened
6. When heading lights to both the front looking and rear-ward looking sensors, the ECM should not be darkened