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Driver's side power window stopped working

Tiny
ADAMW
  • MEMBER
  • 2015 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
I replaced the motor and switch no change. The window moves freely with the motor removed. I also checked for power and continuity to the switch and then to the motor all where good. Does the ECU have anything to do with this?
Tuesday, March 31st, 2020 AT 12:02 PM

25 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

No, it does not.

I attached a wiring diagram for you to view. Do you have a voltmeter to some some voltage checks?

https://www.2carpros.com/articles/how-to-check-wiring

Check the red/violet wire for power.

Roy

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Tuesday, March 31st, 2020 AT 12:54 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
Little over 12 volts.
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Tuesday, March 31st, 2020 AT 12:56 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, when you command down, does the gray wire have power?

Roy
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Tuesday, March 31st, 2020 AT 1:06 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
There are two grey wires at the motor plug one show's 5 volt all the time the other one is showing.4 no change if I hit the switch in either. This is with the new switch the old one is exactly the same result.
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Tuesday, March 31st, 2020 AT 1:36 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
Also since the window has quit the truck is asking me to lower and raise the window but it doesn't work at all.
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Tuesday, March 31st, 2020 AT 1:37 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Can you unplug the window motor and recheck the voltages for me?

Roy
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Tuesday, March 31st, 2020 AT 1:44 PM
Tiny
ADAMW
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  • 15 POSTS
Unplugged both the up and down show 5 volt until switch is pressed at which time they both drop to.3 volts this is the same with new and old switch.
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Tuesday, March 31st, 2020 AT 1:50 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, that is what I wanted to see. You need a power window motor. The voltage is dropped out once it gets to the motor.

Roy
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Tuesday, March 31st, 2020 AT 2:06 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
The motor itself works with direct 12 volts both the old and the new one. But your thinking both are no good?
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Tuesday, March 31st, 2020 AT 2:11 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
Question, should I be able to plug a new window motor to the harness and it operate even if it's unmounted?
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Tuesday, March 31st, 2020 AT 3:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
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The 5 volt signal is being dragged down inside the motor. If you fed the grey wire with 12 volts, that ruined the motor. That should only have 5 volts and you spiked it with 12.

Roy
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Tuesday, March 31st, 2020 AT 3:03 PM
Tiny
ASEMASTER6371
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Yes, it should work but you need to follow the instructions I posted for the relearning.

Roy
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Tuesday, March 31st, 2020 AT 3:07 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
I fed the motor directly not through the plug but with the plug removed. But a brand new motor straight from the auto parts store will not plug in and operate. I have not mounted it to the door yet but this shouldn't matter correct?
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Tuesday, March 31st, 2020 AT 3:07 PM
Tiny
ADAMW
  • MEMBER
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Okay, so the relearn process has to be done before it will operate at?
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Tuesday, March 31st, 2020 AT 3:11 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
Sorry the process has to be done before it will operate at all?
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Tuesday, March 31st, 2020 AT 3:13 PM
Tiny
ASEMASTER6371
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No, not to operate but to operate correctly, yes.

Roy
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Tuesday, March 31st, 2020 AT 3:17 PM
Tiny
ADAMW
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Okay, so I'm assuming something else is still wrong as the second brand new motor still will not operate any at all plugged directly in the harness from the box.
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Tuesday, March 31st, 2020 AT 3:20 PM
Tiny
ASEMASTER6371
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You cannot apply 12 volts to a 5 volt line. You fail the electronics inside the motor.

Roy
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Tuesday, March 31st, 2020 AT 3:28 PM
Tiny
ADAMW
  • MEMBER
  • 15 POSTS
I haven't supplied 12 volts to anything except the 12 volt motor itself completely bypassing ever wire all together, but this brand new motor still doesn't work straight from the box plugged directly to the harness. Still not working at all not even attempting to move the motor.
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Tuesday, March 31st, 2020 AT 3:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Inside the motor is a processor. The wires you powered are signal wires that carry low voltage signal. Look at the diagram I sent you and you will see that there is a processor in the motor.

You spiked the signal side with 12 volts and that damaged the processor.

Roy
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Tuesday, March 31st, 2020 AT 3:38 PM

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