'99 Suburban Left Rear Window Stopped Working

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510man

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The left rear window on my '99 Suburban stopped working. It's an old truck so I replaced the window motor. Worked great when done......and then didn't work an hour later. Step 2, I replaced the rear door switch. No change.

This was relatively cheap guessing. Now I'm to the driver's door switch, which is more expensive to replace. Before I do that, how do I trouble shoot correctly?

I have power and ground at the rear door switch. I have continuity through the switch pins when tested with an ohm meter.

Where does the door ground to the body? In the B pillar between the doors? I ask because I could have ground when testing with a volt meter but it may not be good enough to carry a load.
 
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510man

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I bought a new left door switch. No change. I don't have an extra driver's door set of switches to try. I'd have to buy it. I'm trying to make sure that is the problem since that switch is a spendy part swap test.
 

Big Mama

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Sorry, are the switches on the other doors the same? I have an 07 and they are but I can’t recall if yours are? Are you able to test the motor?
 
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510man

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The two rear door switches are the same. The front doors are different. The motor is new and worked fine after I installed it. Came back to the truck an hour later and nothing.
 

Big Mama

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Right but since it’s not working anymore try the same diagnostics you did at first. My switches are the same on 3 doors so popping one out to test the other is quick and easy.
 

east302

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Here are the diagnostics for a window inoperative from both the window switch and the master switch. Maybe it will help. This is for a 98.

47a87e5b3dc83d9d42518ab0718789e2.gif

7537257f8317510c3b7153b43aa8ce2f.gif

84ea0f2c4794fda607fd7682eb1acc26.gif

97abe0288ce5e476b2164e282bcffef4.gif


Sent from my iPhone using Tapatalk
 
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510man

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Thanks for the test info. I'm at Step 1. I used a volt meter vs a test light. I have voltage at the terminals when the switch is operated either way. I ordered a second new motor that arrived today. It's a Delco so we'll see what happens.

upload_2019-7-20_2-58-8.png
 

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