# Dim headlight info **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [January 22, 2023, 2:26pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657 "2023-01-22T14:26:16Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [January 22, 2023, 2:26pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657/1 "2023-01-22T14:26:16Z")
My car has 9007 bulbs. One side has a bulb that works and then not. I changed bulb but old one tested fine. Then I saw the fuses were blown. Fixed fuses. No light. I tapped new light bulb and it came on. 2 days later no light. Took it out and it checks ok. The wire harness has 3 wires and they go into this device. Then the harness goes into engine bay, what is this device? Where is the ground wire? There is no ground lug in area. ![image](https://global.discourse-cdn.com/cartalk/original/3X/3/c/3cda5a8b9b7c913d92b234e89475a89d32c0c031.jpeg) ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [January 22, 2023, 4:53pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657/2 "2023-01-22T16:53:40Z")
Looks like a lot of corrosion on those metal contacts. It’s probably in the part that connects there, too. I would use electrical contacts spray cleaner and a toothbrush on all affected parts. Maybe even a brass brush. The ground may be the screws or whatever holds that part against the metalwork. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [January 22, 2023, 5:45pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657/3 "2023-01-22T17:45:48Z")
Oh, one time the headlight bulb was about 1/2 brightness. So, on, off, or in between. I could remove device and see what backside looks like. And clean any corrosion like you say. Or get a better pic and look it up ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [January 22, 2023, 6:06pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657/4 "2023-01-22T18:06:33Z")
Is that a QR code on the part? If so, try scanning it. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [January 22, 2023, 6:06pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657/5 "2023-01-22T18:06:37Z")
That is an impact sensor for the airbag control module. You don’t need to clean it with a toothbrush, hit it with a hammer and see if the airbags deploy. For the headlight, look inside the connector for heat damage, the connection is loose. ---
**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\ **Post date:** [January 22, 2023, 7:16pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657/6 "2023-01-22T19:16:39Z")
I had to replace the headlight sockets before. I bought the last one off the shelf at Pep Boys. The socket comes with a few inches of wire. Cut the old wires, strip both sides and solder them together. I put heat shrink tubing on the wires before soldering them, then used the soldering iron to shrink the tubing. ---
**Author:** ![Cavell](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cavell/32/43396_2.png) [@Cavell](https://community.cartalk.com/u/Cavell)\ **Post date:** [January 22, 2023, 7:31pm UTC](https://community.cartalk.com/t/dim-headlight-info/188657/7 "2023-01-22T19:31:39Z")
Why does bulb wire go into impact sensor?