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Power windows not functioning

Tiny
BLESSING EWOBOR
  • MEMBER
  • 2004 TOYOTA HIGHLANDER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 233,465 MILES
Hello, when the "down switch" is pressed, the windows will moved downward but with the "up switch" none of the windows will respond. I have checked the circuit breaker, it was okay. What could be the cause?
Please could you help me with the circuit diagram?
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Monday, October 19th, 2020 AT 7:57 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Hi,

I attached the wiring schematic below in pics 1 and 2. I overlapped them to help you follow them.

Now, first check to see if there is power out from the violet wire at the main switch when you select the up direction. That is what powers the window up. The power is sent via the violet computer data line to other windows. See attached. Remember, the power to raise and lower the window is controlled by reversing the polarity of the power supply. So, if it works down, that tells me that the wire isn't broken, but leads me to believe the switch is bad.

Let me know what you find.
Joe
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Monday, October 19th, 2020 AT 9:06 PM
Tiny
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Thank you.
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Friday, October 23rd, 2020 AT 6:51 PM
Tiny
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You are very welcome. Let us know if you have any questions in the future.

Take care,
Joe
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Friday, October 23rd, 2020 AT 9:36 PM
Tiny
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Sir, for the power window can I get system description for it?
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Thursday, March 11th, 2021 AT 8:48 PM
Tiny
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How it supposed to work.
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Thursday, March 11th, 2021 AT 8:48 PM
Tiny
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All power window switches have power and ground when the switch is pressed. How does it communicate with the ECU for the Motor to function?
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Thursday, March 11th, 2021 AT 9:24 PM
Tiny
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Apart from the ground and power, what else can be checked for?
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Thursday, March 11th, 2021 AT 9:26 PM
Tiny
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  • MECHANIC
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Hi,

It's straight forward. Power is supplied via one of the two wires to the motor. The opposite wire then functions as a ground. If you have power and ground, the motor will work unless it's bad.

Are you checking for power at the motor itself?

Joe
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Friday, March 12th, 2021 AT 5:47 PM
Tiny
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No, I am checking the power at the switch.
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Friday, March 12th, 2021 AT 9:13 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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No problem. Go to the motor and check to see if power is there. Let me know what you find.

Here is a link you may find helpful:

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

I will watch for your reply.

Take care,

Joe
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Friday, March 12th, 2021 AT 10:59 PM
Tiny
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Hi,

This post was in my replies which usually means you had an additional question. Did you need anything? Nothing is listed.

Joe
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Sunday, March 14th, 2021 AT 6:44 PM

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