Help on ID

2008 Tacomo access cab V6 4X4 with tow package. I've been looking under the hood trying to identify as many parts as I can and came across two items I can't identify. There are two small boxes one on each side of the radiator mounted to the frame that have yellow and black wiring sleeves leading from them. Not sure what they are. Also while looking at what it would take to change the head light bulbs I notice a little door near the bulb at the rear of housing and was wondering what that was there for. I'm sure someone here will know what I looking at. I'm new to the 2nd generation although I've had two 1st gen.

 

I think the two small boxes you are talking about are the airbag sensors.

As for the headlight are you talking about the aiming adjustment knob? It has a little cover on it with a door of sorts.

 

There black about 1/2'' in diameter and they look like little doors that have a release like what's on a wiring connector.

 

This ^^^

 

Snap a pic so we can confirm it for you....