DRL lights not working properly

The service vehicle soon light indicates more then likely an electrical issue when it relates to a lighting issue.

This indicator means a number of different things so we should start with checking the codes and finding out of there are any B codes that will point point us in the right direction.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Then we need to check power coming from the relay and find out if it is steady consistent voltage.

https://www.2carpros.com/articles/how-to-check-wiring

Lastly we need to check the grounds and make sure they are clean and tight.

If we run through all this, I am sure we will turn something up that will either fix the issue or point us in the right direction.

Below is the wiring diagram that will help with this. Thanks

There is no resistor on this system. It uses the BCM to control it so based on that code, we need to run through this testing.

Thanks for clarifying this because I understand the check engine light is not on but the SVS light will still set codes as you found with the B2600.

I attached the testing below for this code so let's run through this and that will determine what the issue is. Thanks