The rearview mirror is wigging out, also the back taillights do not work, and the blinker is hyper flashing?

2010 FORD F-150
185,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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BOMAHONY
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This is the second time i have had this issue. The first time it just magically stopped and now it's back. So here is the issue: The backup camera in the rearview mirror is wigging out and turning on randomly even while driving down the road, and also the back taillights don't work, and the blinker is on speed. the front blinkers and the blinkers on the side mirrors work. i am baffled at what it could be. i already changed the taillight bulbs and that didn't fix anything.
Sep 28, 2023 at 10:40 AM
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STRAILER
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Yep, I have seen the microprocessor and out inside the SJB (smart junction box) and cause this issue, to be sure we should do a CAN scan. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:


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



Here is how to change out the SJB, you can get a preprogrammed unit by searching Google or Ebay. Check out the images (below). Please let us know what happens.


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Sep 28, 2023 at 12:21 PM
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BOMAHONY
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would that tool still work even if there is not a check engine light on?
Sep 28, 2023 at 12:43 PM
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STRAILER
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Yes, the check engine light shows issues with the drivetrain not the CAN BUS system.
Sep 29, 2023 at 10:07 AM
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BOMAHONY
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okay, i brought my truck to the auto shop for an unrelated issue and asked them to check out why the back lights was not working and why the rear view back up camera was going crazy. They started pulling fuses out and putting them back in. and that worked for a day and that was yesterday. now today its back like they never did anything

Would the scanning of the CAN scan resolve that issue for good or is this going to be a bigger issue?
i know you can't tell me for sure due to you not seeing it but was wondering about that.
Sep 30, 2023 at 11:06 AM
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BOMAHONY
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I ordered the CAN scanner and I will respond back once I get it and try it out.
Sep 30, 2023 at 4:29 PM
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STRAILER
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Sounds good, please let me know.
Oct 2, 2023 at 9:54 AM
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BOMAHONY
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Well, I got it today and scanned it and there were no DTC issues. Any other ideas?
Oct 3, 2023 at 2:49 PM
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STRAILER
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Can I ask which scanner you have?
Oct 4, 2023 at 8:04 AM
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BOMAHONY
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it is THINKOBD 100.
Oct 4, 2023 at 8:08 AM
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BOMAHONY
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right here.
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Oct 4, 2023 at 8:10 AM
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STRAILER
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Yep, it says CAN but it does not do it. please read these:

https://www.amazon.com/product-reviews/B083F65T8Q/ref=acr_dpx_hist_1?ie=UTF8&filterByStar=one_star&reviewerType=all_reviews#reviews-filter-bar

Here is the one we recommend:

https://amzn.to/3ZYCA1P

Oct 5, 2023 at 8:02 AM
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BOMAHONY
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Okay, so here is the current update. Sorry it took so long but I ended up crawling under the truck and following the wires. I found some wires around the spare tire. I wiggled the wires and now it's working normal again.
Oct 15, 2023 at 10:41 AM
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STRAILER
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I would lower the spare tire to see if the wiring harness is catch up or rubbed through. If you find damage can you please upload an image?
Oct 15, 2023 at 11:10 AM
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BOMAHONY
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Yes, I will check it out soon.
Oct 15, 2023 at 3:09 PM
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BOMAHONY
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These are the 2 things I messed with. They both are against the side beam.
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Oct 16, 2023 at 6:15 AM
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STRAILER
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Thanks for the images :) I don't see that being plugged into anything?
Oct 16, 2023 at 9:37 AM
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BOMAHONY
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yeah, i have no clue what that goes to, but it's a log wire with a lot of slack.
Oct 16, 2023 at 10:03 AM
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BOMAHONY
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Also, i forgot to mention that i replaced fuse 72 - Auxiliary power point (Rear). that brought power to the back, but the blinkers were still on speed. then i went down and moved those wires and bam everything is working now.
Oct 16, 2023 at 10:34 AM
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STRAILER
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It sounds like a bad connection inside the harness, or you have a loose ground at the rear of the truck near where you are moving the harness around.
Oct 17, 2023 at 9:14 AM
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BOMAHONY
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Okay, sorry, it took so long but i was able to unplug the connector to the hitch/rear bumper sensors and that seems to have fixed the issue and not the rear sensors don't work but the lights work in the rear. so, i am counting this as a temporary win.
Nov 3, 2023 at 11:05 AM
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STRAILER
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Thanks for letting us know, we are here to help, please use 2CarPros anytime.
Nov 5, 2023 at 10:47 AM