2007 CTS low beam headlights don't work, but high beams do work

Question

How can I get started on fixing this?

score 1 · Answer 1 · answered Jul 12 '17 at 07:42

Here is an image of a dual-beam bulb. Note that it has 2 filaments as labelled:

You need to check if one of the filaments has fried. If the filament isokay for both high and low beam then you will need to replace your relay

Here is image of the fuse/relay block under the hood:

Check for the low beam as highlighted below:

Test the relay (https://www.youtube.com/watch?v=ire7vyDqelg)
Order the relay if not good
Replace the relay

score 0 · Answer 2 · edited Apr 13 '17 at 12:47

It is common for low beams to get used more than the highs, so it might be as simple as checking and changing the bulbs. Failing that, start by checking the fuse(es). If neither of those moves solve the problem, here are a few questions and answers that will probably help if you get it sorted out:

Also, take a look at the Related links on the right, there is often good information there.

2007 CTS low beam headlights don't work, but high beams do work

2 Answers2