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

Tiny
BOMAHONY
  • MEMBER
  • 2010 FORD F-150
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
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.
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Thursday, September 28th, 2023 AT 10:40 AM

21 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
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

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

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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Thursday, September 28th, 2023 AT 12:21 PM
Tiny
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Would that tool still work even if there is not a check engine light on?
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Thursday, September 28th, 2023 AT 12:43 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
Yes, the check engine light shows issues with the drivetrain not the CAN BUS system.
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Friday, September 29th, 2023 AT 10:07 AM
Tiny
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  • MEMBER
  • 13 POSTS
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.
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Saturday, September 30th, 2023 AT 11:06 AM
Tiny
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  • 13 POSTS
I ordered the CAN scanner and I will respond back once I get it and try it out.
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Saturday, September 30th, 2023 AT 4:29 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Sounds good, please let me know.
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Monday, October 2nd, 2023 AT 9:54 AM
Tiny
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  • MEMBER
  • 13 POSTS
Well, I got it today and scanned it and there were no DTC issues. Any other ideas?
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Tuesday, October 3rd, 2023 AT 2:49 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Can I ask which scanner you have?
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Wednesday, October 4th, 2023 AT 8:04 AM
Tiny
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  • 13 POSTS
It is THINKOBD 100.
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Wednesday, October 4th, 2023 AT 8:08 AM
Tiny
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  • MEMBER
  • 13 POSTS
Right here.
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Wednesday, October 4th, 2023 AT 8:10 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
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

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Thursday, October 5th, 2023 AT 8:02 AM
Tiny
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  • 13 POSTS
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.
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Sunday, October 15th, 2023 AT 10:41 AM
Tiny
KEN L
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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?
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Sunday, October 15th, 2023 AT 11:10 AM
Tiny
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Yes, I will check it out soon.
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Sunday, October 15th, 2023 AT 3:09 PM
Tiny
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  • MEMBER
  • 13 POSTS
These are the 2 things I messed with. They both are against the side beam.
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Monday, October 16th, 2023 AT 6:15 AM
Tiny
KEN L
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Thanks for the images :) I don't see that being plugged into anything?
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Monday, October 16th, 2023 AT 9:37 AM
Tiny
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Yeah, I have no clue what that goes to, but it's a log wire with a lot of slack.
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Monday, October 16th, 2023 AT 10:03 AM
Tiny
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  • MEMBER
  • 13 POSTS
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.
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Monday, October 16th, 2023 AT 10:34 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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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.
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Tuesday, October 17th, 2023 AT 9:14 AM
Tiny
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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.
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Friday, November 3rd, 2023 AT 11:05 AM

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