I just purchased a 2004 4runner. Come to find out that neither the front windshield nor rear window washers work. I replaced one of the pumps (since they are cheap) to see if that would at least get one of em going, that wasn't it. I replaced the wiper/washer switch on the steering column, that wasn't it. Wipers work just fine so the fuse is good. What do both the front and rear washers share that could be giving me problems?