In my experience, a "chirp" is usually metal to metal rubbing as the vehicle flexes as it goes down the road.
The first items I would check are all the bolts that attach the fenders to the cowl and the struts underneath that support the fenders.
The next thing to check is your battery box bolts and the related struts.
After the battery box I would check all the bolts that attach the dash to the cowl. If you don't find any loose fittings so far, then I would fold the windshield frame forward so that I could check the rest of the dash attaching screws. This is a good time to make sure the windshield hinge and door hinge bolts are tight.
Even if the bolts look tight, put a wrench on them and give them a little twist, just to make sure they are tight.
If none of the above cures your chirp, examine your door openings for contact between the door shell and body. Just because the sound sounds like it is coming from under the dsah, doesn't necessarily mean that is where the problem is. Sound travels.
Perhaps you can remove your passenger seat and have an assistant lay on the floor with his head under the dash with a flashlight and listen for the noise.
Good Luck, L.M.
