Wiring Issues between the doors of 2 different years?

Tiny
BUDDER412
  • MEMBER
  • 2007 LEXUS GS 350
  • 3.5L
  • V6
  • 4WD
  • AUTOMATIC
  • 156,500 MILES
I need a schematic diagram of a 2007 Lexus GS 350 Front Left Driver Door and a schematic diagram of a 2010 Lexus GS 350 front left driver door diagram of the wiring harness on the door behind the door panels. I’m trying to splice my harness from a 2007 GS 350 door to the 2010 wiring connector for window regulator. Both harnesses have same wires which are 6 wires together but 2 of them are different colors, the 07 harness being a red and green wire while the 10 harness being a black and brown wire. Them 4 wires are all thick wires while the others are thin.
Sunday, July 27th, 2025 AT 2:42 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yep, there are subtle differences in the wire from year to year, here are both the 2007 and 2010 wiring diagrams for the windows. Check out the images (below). Let us know if you need anything else.
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Monday, July 28th, 2025 AT 12:58 PM
Tiny
BUDDER412
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Thank you! So before I ended up splicing and slicing, I am using a 2010 door with my 2007 car. I am using all 2010 harnesses and the 2010 ecu box on the door since my 07 harness did not fit one connector.

The issue I am having is with the 2010 harness, I can roll down my driver window with the master switch. But I can’t roll down or up my 3 other passenger windows from the master switch. I can lock and unlock the car using the 2010 master switch but cannot roll down any of my 3 passenger windows from the switch. The LED lights are on for the passengers but the driver side is off until I go roll up or the down the window but then will come on for a second then go off.

Now when I hook up the 2007 harnesses to the door and door card and use the 2007 ecu box for the door, I can roll down and up my 3 passenger windows. But I cannot roll down my driver side which I already know because of the connector to plug into the regulator is too big. Which is why I was gonna splice the connector from the 2010 door harness and connect it to the 07 harness but that’s a whole job in itself since the wires down fully match up.

Any idea what the problem could be? Is the master switch bad possibly?
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Wednesday, July 30th, 2025 AT 3:52 PM
Tiny
KEN L
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  • 54,137 POSTS
Yes, there is a chance the master switch is bad, but I would check the ground for the driver side switch under the driver seat. So I can the wiring is the same color but the terminal configuration is way different, what did you do about that? Thanks for the video it helps :)
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Wednesday, July 30th, 2025 AT 5:01 PM

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