So my wipers died in my 89 firebird. It does have delay wipers. For awhile you could hit the stalk on the column and they'd come back. Then they just quit completely. I figured the issue was the switch in the column. Well I finally got around to replacing the switch and heres what I got. Washer works. And the wipers will come on but only in HI and the park switch isn't disengaging to allow them to move. Now out on the wiper motor itself theres a jumper wire tied into the green wire going into the control board. If you take that wire to 12+ it will unlatch the wipers and they'll work in HI. Remove the jumper and the park switch locks back and the wipers will stow away and not be able to travel out again.

What I've noticed about the park wire is if the wiper switch in intermittent or low the wire does actually get 12v on its own and you can hear it un latch the wipers when you hook and unhook the connector. And while in those settings that jumper wire is hot as it is jumpered into that wire.

However when in the HI position the wire looses 12v and you have to use the jumper wire to supply the 12v. You can also jumper the back of the wiper switch itself and it will unlatch.

I've opened up the control board and there 3 places I can tell things got pretty hot. Black residue and the traces are no longer in the board, But the traces are still intact.

I'm suspecting the control board. My question is am I on the right track and Can the control board be responsible for the way it's behaving? I would think the low settings would also work separately from the board but I'm not an expert on these.

And does anyone have a good diagram for an 89 with delay wipers.

 

I do not have the diagram for 1989, but I do have one for 1992, perhaps it's close enough to help?