Driver Window Switch Oddities

[ou18]

Hello all,
I have a 2017 Mustang Gt Premium. Recently the double power window switch on the driver side would not operate the Driver window, but works for the passenger window. All other functions to control both mirrors work as well.

Today I removed the window switch from the door. Using my volt probe (probe with light on it for 12 volt and 6 volt circuits) i tested the switch while attached to the plug going into the door. While i had the probe inserted into position pin 19 (Driver Down), and triggered the switch to put window down, it worked. Motor engaged and window went down. Then moving the probe to position pin 20 (Driver Up) and triggered the switch to put window up, it worked.

HOWEVER without the probe in the pin position i want the window to go, it does not work. I am struggling with whether the switch is bad or do i have a ground issue but only on the driver side. The light probe is grounded to the body of the car using the supplied aligator clip

Any electrical wizards out there have an idea on this?

Much appreciated on any suggestions

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[ou18]

In doing a little more research, I am going to pull the door panel off, so I can test for ground at the motor.
I am curious if by my probe being grounded to the chasis, it created the ground required to trigger the motor. Found a video in 1A Auto on how I can go about testing this as well..



Seems to make sense. Before I order any parts I want to be sure where the actual problem is.

 

[ou18]

Well, today i removed the door panel, Extremely easy to do, 4 bolts\screws.
I used the following post, well written.

Panel Removal To Access Door Internals

Got the panel off and proceeded to do some testing.

So to recap.
Using my volt probe (probe with light on it for 12 volt and 6 volt circuits), I tested the following scenarios:

Switch Plug Tests
1) PASS: Probe inserted into position pin 19 (Driver Down) , Probe Grounded to Chasis triggered the switch to put window down.

2)FAIL: Probe inserted into position pin 19 (Driver Down) , Probe NOT grounded to Chasis triggered the switch to put window down.

3)PASS: Moved probe to position pin 20 (Driver Up) , Probe Grounded to Chasis, triggered the switch to put window up.

4)FAIL: Moved probe to position pin 20 (Driver Up) , Probe NOT grounded to Chasis, triggered the switch to put window up.

Harness To Window Motor Tests (Unplugged from Window Motor)
5)PASS: Probe Attached to Pin for Driver UP, Probe Grounded to Chasis , Probe Light activates

6)FAIL: Probed attached to Pin for Driver UP , Probe NOT grounded, No probe Light (as expected)

7 & 8) Same procedure as 5 and 6, same results in that order

9 & 10) Probe inserted into Driver Up(9) and Down(10) not at same time, Ground End touching Harness Plug Ground, Trigger window switch , Probe Light Activates.

At no point with out the probe light grounded, does the window every triggers the motor and either put the window up or down when harness is attached to motor.

I dont want to just shotgun parts at this, any thoughts from anyone in the forum as to if its the switch or the motor? Is there another test I can do to identify for sure which one is causing the issue. It seems that maybe there is some kind of grounding problem. But which one is causing it, the Switch or the Motor. Im not an electrician, so Im struggling a little here.

Note - Much like the poster of the link I provided in this comment, when i removed the motor harness, i had water inside, enough to be noticeable

Thanks for anyone that might have a direction to go.

Regards
Steve

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