I know in later models,, 98 and up for sure,, is an ambient light sensor.. a little round button looking thingy, usually at the top of the dash, passenger side, you should be able to unplug it or run a jumper wire between wires, if there are three wires, which i think there are use a test light, one should be hot when the e-brake is on., other should be constant,, and a ground if I'm not mistaken. hope this helps...