Turn the ignition switch ON.
Connect the GDS.
Emit intensive light toward photo sensor using a lamp, and check the output voltage change.
The voltage will rise with higher intensive light and reduce with lower intensive light.

| 1. Autolight Signal 2. Autolight Ground 3. Photo Signal (RH) 4. LED Power (Battery) | 5. LED Ground (To BCM) 6. Photo Signal (LH) 7. Photo Power (SW) 8. Autolight Power (5V) |