When you shoot the headlights of the Pickup truck out the cockpit lights stop working.

Additionally even when you turn off lights out with L , the leds over the headlights are still on .
These should also be off so you can insert stealthily.

Also if the headlights are broken the LED lights on top of the headlights should emit a faint light beam so you can use them as backup when your headlights are broken and you are in a completely dark envoirment.