HID headlights not working

2009 CADILLAC CTS
130,000 MILES • 3.6L • V6 • 2WD • AUTOMATIC
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BUMA
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  • 1 POST
Headlights will not come on in either "auto" or "on" positions. Ambient light sensor is functional as instrument lamps dim/brighten as appropriate. Instrument panel headlight indicator is functional. Stack switch is functional. Relay?
Dec 7, 2018 at 7:13 AM
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DANNY L
  • CERTIFIED EXPERT
  • 5,648 POSTS
Hello, I am Danny.

Did you test the headlamp control module? It is located in the engine compartment, near the front right side under the under hood fuse block. I have attached a tutorial for you to view. Hope this helps and thanks for using 2CarPros.

Danny-

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-check-wiring
Dec 7, 2018 at 6:56 PM