[SuperEdd]

Hi guys! (Sienna 2022 ?? limited)
After install new back lights back bumper was off, sensors disconnected by plug and connect back)
I got error message on dashboard Pre-collision malfunction and few more messages
( Photo attached)

 

[banson99]

had this happen after a drive way car wash. restart the car then everything back to normal.

 

[jareza]

Recheck your connections, and restart the car..... Im sure it will correct itself

 

[SuperEdd]

had this happen after a drive way car wash. restart the car then everything back to normal.

Hi ! I disconnected parking sensor. When I got this problem ( Pre-collision malfunction) , I checked sensor when I put selector to reverse, sensor works perfectly. I think the problem with the module Pre-collision.
How to reset system?!

 

[SuperEdd]

Recheck your connections, and restart the car..... Im sure it will correct itself

How to restart the car?! Connector should be ok, I keep it focus when assembly back

 

[jareza]

How to restart the car?! Connector should be ok, I keep it focus when assembly back

a simple restart is to turn the car off, leave it a few minutes and turn back on
If after doing this, the car still malfunctions, then you did something wrong. Go back and check your wiring.
Also, (sorry for my poor photoshop skills) around the back there are two square black boxes behind the bumper, if you moved them, or if there is an obstruction, or a wire that goes over said box, it will alert you that its not working correctly.
If you moved them then a recalibration will be needed and that is done by the dealership

 

[Vanfam12345]

You can try disconnecting the 12V battery for 20 minutes then reconnect. If that doesn't reset it, you'll likely need to do it via Carista or similar

 

[SuperEdd]

a simple restart is to turn the car off, leave it a few minutes and turn back on
If after doing this, the car still malfunctions, then you did something wrong. Go back and check your wiring.
Also, (sorry for my poor photoshop skills) around the back there are two square black boxes behind the bumper, if you moved them, or if there is an obstruction, or a wire that goes over said box, it will alert you that its not working correctly.
If you moved them then a recalibration will be needed and that is done by the dealership


View attachment 59985

a simple restart is to turn the car off, leave it a few minutes and turn back on
If after doing this, the car still malfunctions, then you did something wrong. Go back and check your wiring.
Also, (sorry for my poor photoshop skills) around the back there are two square black boxes behind the bumper, if you moved them, or if there is an obstruction, or a wire that goes over said box, it will alert you that its not working correctly.
If you moved them then a recalibration will be needed and that is done by the dealership


View attachment 59985

I will check on weekends and let you know.
I think the wires touch the box .
We will see. I will share a photo for your guys.
Thanks guys

 

[jareza]

I will check on weekends and let you know.
I think the wires touch the box .
We will see. I will share a photo for your guys.
Thanks guys

Theres your answer, these are the BSM sensors. so If they detect any obstruction, they will give you a malfunction

 

[SuperEdd]

Hi guys! I figure out what wrong, but I don't know how to solve the problem ((.
Today I disconnected back bumper, changed position of all wires, for prevent touch some parts ( but previous position was perfect).

But when I install back bumper, and trying to turn on ignition the error messages pop up again.
The I connected reader they showed next error code

I think the problem with Stop Lamp Relay Actuator Stuck On
Right looking for how to solve this problem)
If not figure out I will connect all light with towing light
If you have this problem let me know. Thanks

 

[SuperEdd]

I found this link

Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual - Stop Lamp Relay Actuator Stuck On (C13807E) - Vehicle Stability Control System

www.lexusrx.net

 

[jareza]

Going back to your original message it seams like you installed a wiring harness for towing. And from the looks of your error codes, something in the wiring harness is shorted to ground.
My suggestion is to remove what you installed, plug everything back in. If the error codes go away then your connections are shorted.
Those error codes are being thrown because something is grounding the harness.

 

[jareza]

If you dont want to be playing the mouse and cat game, take it to the dealership so that they can track where the short is.