Front passenger door module communication failed?

Tiny
MALLYBOY
  • MEMBER
  • 2017 LEXUS RX 350
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 112,345 MILES
This vehicle started this problem after bouncing into port hole at the highway, With vehicle Locked, when you press the key fob UNLOCK steadily, the Windows wind down and the boot opens but when you press LOCK FOB BUTTON steadily, the Windows will not rise and boot will not close and all remains open, what could be done to fix the communication problem of passenger front door. Diagram needed
Saturday, December 13th, 2025 AT 5:07 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,272 POSTS
Yep, the main body ECU sounds like it has gone out, but to be sure we should do a CAN scan, there are a few things that can cause this included the certification ECM so you don't want to go in the wrong direction in the repair process, please go over this video to help us get started.

CAN SCAN - https://youtu.be/u-4syLc-ifQ

I would remove the battery cables and then check the electrical connector at the modules for corrosion with a flashlight. It looks like the main body ECU is under the dash on the drivers side. Check out the images (below). Please let us know what happens.
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Monday, December 15th, 2025 AT 12:40 PM

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