Lights will flicker every so often as I'm driving, the horn will honk intermittently?

JUDAHPL12

MEMBER
2011 TOYOTA SIENNA
3.5L
V6
2WD
AUTOMATIC
210,000 MILES

Hi,

I have the vehicle listed above that has some random glitches. They began after the battery was mostly drained and I put a booster pack on the battery to jump it. Ever since I did that the lights would flicker every so often as I'm driving, the horn will honk intermittently with little chirps and, most annoyingly I'll go to turn the key off, and occasionally the motor will keep running. Other than that, the rest of the electronics seem totally normal. It runs and drives fine. Has anyone experienced anything similar, and what did you find as a solution? Thanks!

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
43,046 POSTS

It sounds like you may have a loose/bad or corroded connection at the battery, this guide can help us check it out and fix it:

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Also, we should run a CAN scan which goes over the entire car and is easy to do. You can get a CAN scanner from Amazon for about $30.00.

Here is a video to show you how:

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

Here is a scanner link:

https://amzn.to/3o41KcZ

I have looked up the wiring diagrams and it looks like the integration relay is going out, here is the location of the relay which is inside the engine fuse panel junction box so you can swap it out, this would explain the problems you are having. Let me know what happens please and check the images below.

Image (Click to make bigger)

Lights will flicker every so often as I'm driving, the horn will honk intermittently?

1 Reply

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