First rain of the season yesterday and the wipers were working fine; until the rain stopped, but the wipers would not.

Tried various things like moving from off to intermittent, pull the stalk back, change speeds then back to off, etc.

Still wouldn't stop, so as I was driving I'd occasionally hit the spray button to lubricate the blades. Then out of the blue, they decided to stop.

Thought it was a sticky relay, but looking at the wiring diagram there is no relay.

Any suggestions of what might be my trouble?

Thanks!

 

The 90MY changed the wiper setup and uses a logic module.

The problem is either the logic module is bad or one of its inputs (switches). There is a park/run switch in the wiper motor if this is stuck in the run position or the wiper switch stalk could be faulty. It MUST be one of these 3 things.

I would suspect there is only 1 connector on the logic unit (RH Component panel).

Disconnect the connector from the Logic unit before you start this.

Park/Run switch is between pin 2 & 8 with the wipers parked this should be open circuit. No continuity.

Pin 2 is common for all switches and 3,4,5 come from the stalk, there should be NO continuity here either.

 

Finally got a spare moment to find and test the logic module pins.

With the ignition OFF, there is no continuity between pin 2 and 3,4,5 or 8.

With ignition ON, there is no continuity between pin 2 and 3,4,5, but there is continuity between 2 and 8.

So I suppose that means it's the Park/Run switch. Is this something repairable or does the wiper motor have to be replaced?

Thanks