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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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DRL not working but lights come on when I cover the sensor,

Customer Question

DRL not working but lights come on when I cover the sensor
JA: Just to clarify, what are the exact lights you're talking about?
Customer: daytime running lights
JA: What is the model/year of your Chevy?
Customer: its a 2003 alero
JA: Are you fixing your Alero yourself? What have you tried so far?
Customer: if I cover the sensor the lights come on
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 7 months ago.
Category: Chevy
Expert:  BOBBYSS replied 7 months ago.

Hello, my name is***** to clarify, when you cover the sensor the DRL's come on or the headlamps come on? Do all of the other exterior lights work fine?

Customer: replied 7 months ago.
all lights work ok
Expert:  BOBBYSS replied 7 months ago.

Thank you. Most of the time the issue is in the DRL relay. The relay fails and causes this. It can also be a circuit issue as the resistor fails or there is a problem with the switch. It would take some testing to know for sure. You can remove the DRL relay and switch it with a similar relay to see if they start to work. If they do then the relay is bad.