Windshield washer diagnosis

[cartercd]

My windshield washer is not working. Here is what I have done so far:

1. I applied 12V directly to the pump and squirted water all over myself, so I know the pump works.
2. Put a multi-meter on the harness connector to the pump and switched both front and rear washers on. I got no reading for either. Incidentally, the wipers do work.

So it appears the problem is somewhere between the switch and the pump connector. The wiring harness doesn't appear to have any damage. What is my next logical step? I was leery about tearing into the steering column without getting some MUD advice first. Is replacing the wiper/washer stalk pretty straightforward? Is there a relay in the system?

Thanks

 

[cheddar bob]

I'm resurrecting an old thread because I've got this same issue. I'm sure there's a relay, the question is where?!

My pump works and I can get one squirt session right after I start the truck, then nada. It's got to be the relay. Any help is appreciated.

 

[Jason Andrews]

I had gunk in the nozzles that squirt the fluid. I took a needle and stuck it in the 2 holes of each of the 2 nozzles on the hood and it cleaned out the lime or whatever buildup. Worth a shot....

 

[Aggiesdm]

Bump for info

I have the same issue on my '91. No squirty. I checked power at the pump and seems be getting a constant 12v, so I wonder if the switch is some sort of ground interrupting switch and maybe the ground is bad? Relay? Any insight would be greatly appreciated.

 

[cheddar bob]

I had gunk in the nozzles that squirt the fluid. I took a needle and stuck it in the 2 holes of each of the 2 nozzles on the hood and it cleaned out the lime or whatever buildup. Worth a shot....

I appreciate the input, but I've ruled out the pump and the lines.

Aggiesdm is on the right track. I just don't know how the pump is activated and where that relay is or if it's a possible bad switch.

 

[cheddar bob]

What the EWD says

I've attached the applicable .pdfs including the wiper/washer diagram. Per the EWD, it looks like the switch activates the washer pump motor directly. Am I correct to rule out the diode and assume it would have no effect on the washer pump operation?

Also see the highlighted section of the first page attached. Am I correct to interpret this to mean that if the wiper blades move, but no fluid is spraying, the switch is good and the only remaining piece that could be at issue is the pump itself?

Any input would be greatly appreciated.

A side note, this morning the pump worked for the first few tries, then stopped. When it was working, the stream seemed to be weaker than normal. Further evidence of a dying pump?

 

[Aggiesdm]

Not sure?

I'm not good at reading schematics, but looks like your on the right track. I need to recheck the lines going to my pump. Are there separate pumps for front and rear? Seems if the wipers actuate when you try to squirt, then the switch must be working. I've tried two different switches with same results...no squirty, must be pump. Anyone know how much new OEM pump is and part number?

 

[cheddar bob]

There's a diverter valve on the driver's side. I recently replaced mine, 5 minute job. Just follow the lines.

Hopefully someone will chime in to confirm all of this.

 

[Timpanogos Slim]

I've attached the applicable .pdfs including the wiper/washer diagram. Per the EWD, it looks like the switch activates the washer pump motor directly. Am I correct to rule out the diode and assume it would have no effect on the washer pump operation?

Also see the highlighted section of the first page attached. Am I correct to interpret this to mean that if the wiper blades move, but no fluid is spraying, the switch is good and the only remaining piece that could be at issue is the pump itself?

Any input would be greatly appreciated.

A side note, this morning the pump worked for the first few tries, then stopped. When it was working, the stream seemed to be weaker than normal. Further evidence of a dying pump?

Well, if the diode is cooked or loose, it won't work. So, don't rule it out.

The switch does seem to activate the washer motor directly (by providing a path to ground).

There does seem to be plenty in the switch that has a potential to fail. I have no idea if it's a common failure point.

 

[okcruiser]

Bringing this thread back as I'm having this exact same problem. Initially thought it must be the washer pump so replaced with new oem today and still nothing. No power arriving at the pump but the switch works and wipers activate when pressed. Did anyone ever confirm a diagnosis on this one?

 

[FloridaFJ80]

I am having a similar issue. i can hear the pump pumping, I disconnected the hose from the diverter valve coming from the pump and nothing comes out.. These is as far as I got. I did remove the hose from the pump and water came out but couldnt test to see if when the pump is actuated there is pressure from the pump. Need a helper

 

[Bella1992]

My washer wiper fluid shooters haven't worked since I purchased my cruiser