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Auto headlights always on

Tiny
DNC11
  • MEMBER
  • 2016 FIAT 500X
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 26,500 MILES
Hi, I have an error on my car that says "Service auto Headlights". They are always on even under the sun when the switch is positioned on Auto. Tried switching the twilight sensor for a new one, but it did not work. Any suggestions?
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Saturday, February 22nd, 2020 AT 11:47 AM

9 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Let's start with checking for codes. These Fiat's don't operate like you would normally think things would function so given the code, I am sure we will figure out what the issue is.

Based on the fact that the headlamp doesn't go off, tells me that it is either a circuit issue or an input to the BCM is causing the headlamps to stay on. Do they shut off when the switch is turned off?
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Saturday, February 22nd, 2020 AT 3:27 PM
Tiny
DNC11
  • MEMBER
  • 6 POSTS
Yes, once I turn the car off, the lights go off as well. They stay on when the ignition is on “on” or the engine running. I’ll try to scan the car again and find the code.
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Saturday, February 22nd, 2020 AT 9:24 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay. Sounds good. Let us know what you find and we can go from there. Thanks
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Sunday, February 23rd, 2020 AT 8:23 AM
Tiny
DNC11
  • MEMBER
  • 6 POSTS
I could not find an error code for this issue!
Nothing related to lights pops up. However, I think you are right; there is something going on with the BCM. Now it says "service power steering".
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Monday, February 24th, 2020 AT 6:33 AM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
There are no codes!

What kind of scanner are you using?
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Monday, February 24th, 2020 AT 2:41 PM
Tiny
DNC11
  • MEMBER
  • 6 POSTS
OBDLink Mx and I am using the app from the same scanner; no codes related to these issues! Even though the "service power steering" light is on, the car drives just fine.
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Monday, February 24th, 2020 AT 8:24 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Okay. The fact that the vehicle drives properly then I suspect we have a software issue. Which lead me to look for a TSB and there is one that fits this concern. Unfortunately that means we will need to take this to a dealership so that this software update can be performed.

I suspect this software will address the issues you are seeing. Thanks
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Tuesday, February 25th, 2020 AT 5:39 PM
Tiny
DNC11
  • MEMBER
  • 6 POSTS
Thanks for this info. Unfortunately, my car is not under warranty anymore. I’m sure they’ll want to charge me a crazy amount of money to get this done.
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Tuesday, February 25th, 2020 AT 6:12 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Understood. However, updates like this are not very costly. Most dealerships charge a flat fee to have all available flashes performed. I would just call and ask them how much they would charge to get all available flashes done. Then call a couple others and pick the cheapest dealership. There is only one way to do it so the cheapest dealer is the best in this case. They literally just hook the scan tool and perform the updates.

If we can get these done, I would be surprised if it didn't correct the issue.
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Wednesday, February 26th, 2020 AT 5:03 PM

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