There is another way that I saw on a forum somewhere. I don't know if you already fixed your problems, but I might as well share the knowledge.
I had the issue and did this super simple DIY thing and have been error free ever since.
I have a FL car and it is always exposed to a lot of humidity, therefore oxidation is easy to occur on the metal connectors of the plastic housing that you twist into the light assembly.
All you need for this is some Metal Polish, a rag, and a small screw driver.
It's easy to twist out the lights in the back and you'll see two metal prongs that connect to the light assembly (which is where the power connection occurs, I guess. Sorry, not an electrician so pardon the lack of technical terms)
Ok, so if it looks dull and somewhat oxidized this could be where the problems come from, it was for me. The connection has simply gone bad from oxidation getting in the way.
So here are the steps I followed: (as simple as I can explain them)
- Remove the lightbulb housing
- Inspect the bulb to see if it's ok
- If it's ok, you can polish up the base of the bulb too. Turned into reflective aluminum from a dull start. (Make sure to clean it good afterwards removing all the polish)
- Inspect the metal pieces that connect to the bulb in the little plastic housing
- If the plastic under the metal tabs on the edges is burnt/bubbled, it can be a power problem. (I heard sanding down the bubble and lifting the tab away from it could do the trick *not confirmed*)
- If not, then it can be a connection issue.
- Take your screwdriver and look at the sides. There you'll see two locking hooks that prevent the metal pieces from falling out. Use the little screw driver to push down the hooks and gently lift out the metal bits.
- Polish up the oxidized metal. ALL of it. I know, it can be a pain to get in the tight spots, but it ensures a solid connection. (Again went from dull to reflective metal)
- Once polished with the metal polish, clean the tabs thoroughly to remove all polish.
- Simply slide the tabs back in the housing. Make sure they're tight and the little locking hooks are in order.
- *TRICK* Once I put the tabs back in, I used the small screw driver to lift the tabs that connect the plastic light housing to the light assembly to make sure they press together tightly when connected.
- Place light bulb back into housing
- Replace lights into brake sockets. (Both housings are the same pieces, so left and right doesn't matter)
And that's it. Takes about 30 min start to finish if you have a good polish.
Worked for me, didn't take long at all, and the best part is I didn't have to pay stealership labor hours!
Hope this helps some people out!