Wiper Oddity

[sdg3205]

My wipers are misbehaving.

Here's what they do:

1. No matter what, when power is cut via the stalk with ignition ON, they stop immediately before returning to baseline/rest position.
2. LOW and HIGH both work, BUT:

• If i move the stalk from OFF to LOW back to OFF ONCE - the wipers continue indefinitely
• If i repeat the move from OFF to LOW back to OFF a SECOND time - they stop (albeit, anywhere they want)

3. Intermittent works only if the stalk is held down and the wipers stop as soon as it is released

What I've tried:

1. I've bypassed the controller module (plug the plugs into themselves)
2. checked the inline inductor for "park" power after the stalk is turned off (Dave S's suggestion) and seems to be properly connected unless IT itself has failed.

Toby mentioned there is a micro switch in the motor that kills power only after baseline/rest is attained, but i don't understand how that micro switch could be at fault given the behaviour above with LOW.

Here's a video:


https://www.youtube.com/watch?v=u9EyiPGt5CY

Thoughts?

[DMCMW Dave]

It almost has to be the switch inside the unit itself. That could conceivably stick open (so it stops wherever) or closed (so it never stops).

[sdg3205]

Ok, thanks Dave. I'll move forward with the surgery.

[sdg3205]

Has anyone removed or replaced the wiper motor before? I need the Coles notes version - some serious pointers - because I can't even get my iPhone in there to see what kind of bolts I'm dealing with.

The workshop manual is of no help.

[sdg3205]

Well, I finally tackled this job and as i expected, it sucked.

You can see above that my wipers were doing some very bizarre things, the number one problem is there was no park.

I received the replacement from Toby last weekend and plugged it in to verify it would return to a park position when the stalk was moved to "off." It did. I verified intermittent function and function of the delay module. It worked. Ok. These are good things.

Now to remove the old one, right? Well after using video scopes to try and see what i was doing, contorting myself in terrible poses and getting my hand stuck I just said the heel with it and removed the pedal box.

Removal is fairly straight forward. You don't have to open any hydraulic systems. The box is held in place by a few 13mm nuts. Once removed i had good access, though the actual 10mm and 13mm nuts and bolts was still hard given the tilt angle they are on.

I disassembled the wiper transmission as I've done before. You can see a weird burn on the surface. A piece of plastic that once resided there was stuck to the brush, perhaps compromising conductivity. At any rate, I'm glad its out.

Tomorrow I'll install the new wiper motor and re-install everything else. Wipers are kind of a big deal in the pacific north west.

326223262332624326253262632627

[papanoel]

Funny my wipers have a similar issue. I have to try a million things to get them to turn off.

[sdg3205]

Funny my wipers have a similar issue. I have to try a million things to get them to turn off.

Try bypassing the delay module by plugging the molex connectors into themselves (as opposed to the delay box). this will let you know if it's a motor or relay issue.