Flasher relay to my car

As soon as you post your code much better taylored suggestions can be made. And only in case that you post your code other users will be able to point on the problems that might be inside your code

always post your complete sketch.
From the very first line of code to the very last line of code.

You can do this with a two mouse-clicks and pressing ctrl-V

Even if you only changed a single character in your code.
Post the actual complete sketch new
as a code-section.

Posting always your actual code avoids misunderstandings like "in my previous code" (which previous one the last previous or the for last previous??? etc.