There is a fuse that protects that circuit. Remove the fuse - the DRL's go out. .
Short of pulling the fuse that protects that circuit - no.
To change the daytime running light on a 2009 Cadillac CTS, start by opening the hood and locating the headlight assembly. Remove the headlight assembly by unfastening the necessary screws or clips, then disconnect the electrical connector for the daytime running light bulb. Replace the old bulb with a new one, ensuring it is securely in place, and reassemble the headlight assembly. Finally, test the light to ensure it’s working properly before closing the hood.
No
The only way to "turn them off" would be to modify the wiring system. Unless you are a professional and have the wiring diagrams for the truck, I would recommend leaving the system alone.
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Most likely burnt out bulb.
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