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 looking sensor.
4. The ECM should be darkened as soon as the rearward looking sensor detects the light.
   NOTE: If this test is performed in daytime, the ECM may be darkened as soon as the forward facing sensor is covered.
5. When the reverse gear is engaged, the ECM should not be darkened.

When heading lights to both the forward facing and rearward looking sensors, the ECM should not be darkened.