Do Impalas come with DRLs, or can they be added?
All Canadian model Impalas come equipped with standard daytime running lights (DRLs), but no American model comes that way. However, GM does make a module that allows DRLs on American models. This module (P/N 12370131) CAN be made compatible with the Twilight Sentinel System which came as original equipment on the car. Installation note 1 on the back of the instruction sheet details a remedy to prevent interaction with the Twilight Sentinel that results in relay chatter and flickering parking lights. It involves installing a standard automotive 5 pin SPDT relay to isolate the Twilight Sentinel output from the headlamp circuit when the Twilight Sentinel is not activated. The only hard part was finding the Twilight Sentinel Module (I had not received my service manuals yet and the instructions don’t tell you where it’s at). It is located under the glove box behind the passenger kick panel. The system works like this: Start car in daylight; 15 seconds later headlamps come on (low beam onl
