Change running light bulb on fiat 500

This appears to be a well known issue. I found this

Solved maybe
.
I had the same issue when i changed one of the Daylight Running Lights in the front and one of my rear brake lamps.
I ended up changed both brake lamps since its a two pack, the front lights all looked well.
The rear, one was off even if i changed both.
I was puzzled but then tried to turn off my DRL from the menu section on the front panel which didn't work.
Opened the brake lamps and checked them again and they all worked.
I reset my error codes (check your manufacturer book) mine was 5 pumps with engine off then key out and then engine on.
The "check running lights" code disappeared as well. Make sure to check all your lights are on(front back.
Hope that works for one of you at least!

and also

I has the exact same issue. DRL going out when headlamps turned on. I found the problem. It's a simple fix.

It was a bad connection between the bulb and the bulb holder. I noticed wiggling the bulb made it come on and off.

The fix is to bend the exposed wires on the bulb so that they stand proud rather than squashed flat against the bulb.

I did it by gently prizing them away from the bulb and then I put a small screw driver underneath it and pressed the wire back down again. You could use a cocktail stick or march stick or similar.

This makes the contact between the bulb and the holder tighter. Job done.

Lots more here.

https://www.google.com/search?q=2009+Fiat+500.+Yellow+triangle+on+dash+%27check+running+lights%27

..

What about fuse?

https://www.fiatusa.com/download/pdf/manuals/2014-FIAT-500L-OM-1st.pdf

it's in your owners manual page 358 chapter 7

you need a torx 20 screwdriver or bit

Rear Tail, Stop, Backup And Turn Signal Lamps
1. Open the liftgate.
2. Remove the two screws and remove the tail lamp assembly.
3. Remove the four screws (using a T20 driver) and separate the backplate from the lamp housing.
4. Remove the tail, stop, or turn signal bulbs by pushing them slightly and turning counter-clockwise.
5. Remove the backup lamp bulb by pulling straight out.
6. Replace lamps as required and reinstall lamp.

Center High-Mounted Stop Lamp (CHMSL)
This light is an LED assembly. See your authorized stealership

Ive had the triangle warning light on with message saying check running lights,after spending about 2hrs today checking connections and bulbs it would appear that after changing tail light bulbs on both rear clusters and both stop and tail bulbs the problem has now gone

check the fuse first if both lights arnt working. u can change by the access panel inside car behind light. turn and pull and light comes out

From my User Guide p. 63: 8,000 miles or 6 months - oil and filter change, rotate tires. At 16,000/1 yr more extensive inspections and filter changes.

With all doors closed, put key in ignition and turn key to first position only, and fully depress and release the accelerator pedal 5-7 times. Pedal must be pressed all the way down and fully released these 5-7 times. I hope this helps!

Yes change the bulbs and if you have a tester, make sure there is power to the light bulb holder.

It's the reverse light switch witch is under the dash above the brake most likely