Repair Procedures: 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 forward facing sensor.
3. Head a light to the rearward-facing sensor.
4. The ECM shall dim as soon as the rearward-facing sensor detects a certain level of brightness.
   NOTE: If this test is performed in daytime, the ECM may be darkened as soon as the forward facing sensor is covered.
5. In the reverse gear, the ECM shall not dim.

   When directing light to both the forward-facing and rearward-facing sensors, the ECM shall not dim.