If you want add an external relay, the LPA4 can manage the lights with the following features:
-The lights are turned on 20 secconds after engine power up. If the lights turn on fail, a warning will be generated.
-If the sensor sold separately is added, the lights can turn on when detecting darkness (twilight on).
-As user preffer the lights will be switched off inmediatley when engine is stopped or can delay 30 seconds (called parking light).
The additional wiring diagram is the following: