Circuit/System Verification

Ignition ON.
Verify the left daytime running lamps turns ON and OFF while commanding the Left Dedicated Daytime Running Lamp ON and OFF with a scan tool.
- If the left daytime running lamps do not turn ON and OFF
  Refer to Daytime Running Lamps Malfunction .
- Go to next step: If the left daytime running lamps turn ON and OFF
Verify the right daytime running lamps turns ON and OFF while commanding the Right Dedicated Daytime Running Lamp ON and OFF with a scan tool.
- If the right daytime running lamps do not turn ON and OFF
  Refer to Daytime Running Lamps Malfunction .
- Go to next step: If the right daytime running lamps turn ON and OFF
Verify the scan tool Ambient Light Status parameter changes while switching from dim to bright ambient light conditions
NOTE:
- Vehicles equipped with RPO CE1 use the B200 Rain Sensor Module for ambient light status. Vehicles without RPO CE1 use the B10B Ambient Light/Sunload Sensor for ambient light status.
- Placing a towel over the ambient light sensor can simulate a dim light condition and shining an incandescent light at the ambient light sensor can simulate a bright light condition.
- If the parameter does not change and the vehicle is equipped with RPO CE1
  Refer to Rain Sensing Module Malfunction .
- If the parameter does not change and the vehicle is not equipped with RPO CE1
  Refer to Ambient Light Sensor Malfunction .
- Go to next step: If the parameter changes and the automatic headlamps turn ON and OFF
All OK.