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HelloCustomer Here is the diagram for your blower circuit. You will have 12 volts before the resistor, since the resister reduces the voltage for your lower speeds. If the resitor fails, you will only have high speed, since that speed bypasses the resistor all together. There is only on ground G200 that controls this whole circuit. Check for your signal into the relay from the resistor. If you have no power at it, the resistor is bad. Fix that first and see if you lighting issue goes away. Let me know if you need any further help as you proceed.
Your JA Expert,
Here is what I found for the blower relay.
The Blower Motor Relay is located in the Blower Resistor Assembly and cannot be serviced separately. The Blower Resistor Assembly is located behind the right side of the Instrument Panel (IP) , in the right side of the heater-A/C control module.
And here is the ground location.
Right side of the IP cross beam, behind the fuse block
Here is a diagram of the Daytime running lights. Look for your common points. May be unplug the daytime running light module and see how the fan responds.
Here is the location for that module and it is in the same vicinity. I think you have 2 wires touching each other in that area.