My girlfriends 2002 cavalier had a corroded high beam wire located near the connector under the battery. To get at it I had to remove the battery and the air filter box. The pink wire (high beams) was corroded so I just stripped the wire and soldered a new wire in where it was corroded. You can ohm out the wires easily by disconnecting the connector under the battery and ohm out the wires from that connector to the headlight connector.